GroupU - 05012018 1543

Fork of 352 by Elec351 MMB

Revision:
1:84581acd1333
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sd-driver/TESTS/filesystem/fopen/fopen.cpp	Tue Jan 09 14:53:07 2018 +0000
@@ -0,0 +1,1534 @@
+/*
+ * mbed Microcontroller Library
+ * Copyright (c) 2006-2016 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/** @file fopen.cpp Test cases to POSIX file fopen() interface.
+ *
+ * Please consult the documentation under the test-case functions for
+ * a description of the individual test case.
+ */
+
+#include "mbed.h"
+#include "mbed_config.h"
+#include "SDBlockDevice.h"
+#include "FATFileSystem.h"
+#include "fsfat_debug.h"
+#include "fsfat_test.h"
+#include "utest/utest.h"
+#include "unity/unity.h"
+#include "greentea-client/test_env.h"
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>     /*rand()*/
+#include <inttypes.h>
+#include <errno.h>
+/* mbed_retarget.h is included after errno.h so symbols are mapped to
+ * consistent values for all toolchains */
+#include "platform/mbed_retarget.h"
+
+/* This is needed for stat() test, but is not available on ARMCC.
+ * The following checks whether GCC_ARM compiler is being used because:
+ * - both the ARMCC compiler and the GCC_ARM compile define __GNUC__.
+ * - only the ARMCC compiler defines __ARMCC_VERSION.
+ * - hence if __ARMCC_VERSION is not defined and __GNUC__ is defined, it must be GCC_ARM. */
+#if ! defined(__ARMCC_VERSION) && defined(__GNUC__)
+#include <sys/stat.h>
+#endif
+using namespace utest::v1;
+
+/// @cond FSFAT_DOXYGEN_DISABLE
+#ifdef FSFAT_DEBUG
+#define FSFAT_FOPEN_GREENTEA_TIMEOUT_S     3000
+#else
+#define FSFAT_FOPEN_GREENTEA_TIMEOUT_S     1000
+#endif
+/// @endcond
+
+
+/* DEVICE_SPI
+ *  This symbol is defined in targets.json if the target has a SPI interface, which is required for SDCard support.
+ *
+ * MBED_CONF_APP_FSFAT_SDCARD_INSTALLED
+ *  For testing purposes, an SDCard must be installed on the target for the test cases in this file to succeed.
+ *  If the target has an SD card installed then the MBED_CONF_APP_FSFAT_SDCARD_INSTALLED will be generated
+ *  from the mbed_app.json, which includes the line
+ *    {
+ *    "config": {
+ *        "UART_RX": "D0",
+ *        <<< lines removed >>>
+ *        "DEVICE_SPI": 1,
+ *        "FSFAT_SDCARD_INSTALLED": 1
+ *      },
+ *  	<<< lines removed >>>
+ */
+#if defined(DEVICE_SPI) && defined(MBED_CONF_APP_FSFAT_SDCARD_INSTALLED)
+
+static char fsfat_fopen_utest_msg_g[FSFAT_UTEST_MSG_BUF_SIZE];
+#define FSFAT_FOPEN_TEST_MOUNT_PT_NAME      "sd"
+#define FSFAT_FOPEN_TEST_MOUNT_PT_PATH      "/"FSFAT_FOPEN_TEST_MOUNT_PT_NAME
+#define FSFAT_FOPEN_TEST_WORK_BUF_SIZE_1    64
+#define FSFAT_FOPEN_TEST_FILEPATH_MAX_DEPTH 20
+static const char *sd_badfile_path = "/sd/badfile.txt";
+static const char *sd_testfile_path = "/sd/test.txt";
+
+SDBlockDevice sd(MBED_CONF_SD_SPI_MOSI, MBED_CONF_SD_SPI_MISO, MBED_CONF_SD_SPI_CLK, MBED_CONF_SD_SPI_CS);
+FATFileSystem fs("sd", &sd);
+
+#define FSFAT_FOPEN_TEST_01      fsfat_fopen_test_01
+#define FSFAT_FOPEN_TEST_02      fsfat_fopen_test_02
+#define FSFAT_FOPEN_TEST_03      fsfat_fopen_test_03
+#define FSFAT_FOPEN_TEST_04      fsfat_fopen_test_04
+#define FSFAT_FOPEN_TEST_05      fsfat_fopen_test_05
+#define FSFAT_FOPEN_TEST_06      fsfat_fopen_test_06
+#define FSFAT_FOPEN_TEST_07      fsfat_fopen_test_07
+#define FSFAT_FOPEN_TEST_08      fsfat_fopen_test_08
+#define FSFAT_FOPEN_TEST_09      fsfat_fopen_test_09
+#define FSFAT_FOPEN_TEST_10      fsfat_fopen_test_10
+#define FSFAT_FOPEN_TEST_11      fsfat_fopen_test_11
+#define FSFAT_FOPEN_TEST_12      fsfat_fopen_test_12
+#define FSFAT_FOPEN_TEST_13      fsfat_fopen_test_13
+#define FSFAT_FOPEN_TEST_14      fsfat_fopen_test_14
+#define FSFAT_FOPEN_TEST_15      fsfat_fopen_test_15
+#define FSFAT_FOPEN_TEST_16      fsfat_fopen_test_16
+#define FSFAT_FOPEN_TEST_17      fsfat_fopen_test_17
+#define FSFAT_FOPEN_TEST_18      fsfat_fopen_test_18
+#define FSFAT_FOPEN_TEST_19      fsfat_fopen_test_19
+#define FSFAT_FOPEN_TEST_20      fsfat_fopen_test_20
+#define FSFAT_FOPEN_TEST_21      fsfat_fopen_test_21
+#define FSFAT_FOPEN_TEST_22      fsfat_fopen_test_22
+#define FSFAT_FOPEN_TEST_23      fsfat_fopen_test_23
+#define FSFAT_FOPEN_TEST_24      fsfat_fopen_test_24
+#define FSFAT_FOPEN_TEST_25      fsfat_fopen_test_25
+#define FSFAT_FOPEN_TEST_26      fsfat_fopen_test_26
+#define FSFAT_FOPEN_TEST_27      fsfat_fopen_test_27
+#define FSFAT_FOPEN_TEST_28      fsfat_fopen_test_28
+#define FSFAT_FOPEN_TEST_29      fsfat_fopen_test_29
+#define FSFAT_FOPEN_TEST_30      fsfat_fopen_test_30
+
+
+/* support functions */
+
+/*
+ * open tests that focus on testing fopen()
+ * fsfat_handle_t fopen(const char* filename, char* data, size_t* len, fsfat_key_desc_t* kdesc)
+ */
+
+/* file data for test_01 */
+static fsfat_kv_data_t fsfat_fopen_test_01_kv_data[] = {
+        { "/sd/fopentst/hello/world/animal/wobbly/dog/foot/frontlft.txt", "missing"},
+        { NULL, NULL},
+};
+
+
+/** @brief
+ * Split a file path into its component parts, setting '/' characters to '\0', and returning
+ * pointers to the file path components in the parts array. For example, if
+ * filepath = "/sd/fopentst/hello/world/animal/wobbly/dog/foot/frontlft.txt" then
+ *  *parts[0] = "sd"
+ *  *parts[1] = "fopentst"
+ *  *parts[2] = "hello"
+ *  *parts[3] = "world"
+ *  *parts[4] = "animal"
+ *  *parts[5] = "wobbly"
+ *  *parts[6] = "dog"
+ *  *parts[7] = "foot"
+ *  *parts[8] = "frontlft.txt"
+ *   parts[9] = NULL
+ *
+ * ARGUMENTS
+ *  @param  filepath     IN file path string to split into component parts. Expected to start with '/'
+ *  @param  parts        IN OUT array to hold pointers to parts
+ *  @param  num          IN number of components available in parts
+ *
+ * @return  On success, this returns the number of components in the filepath Returns number of compoee
+ */
+static int32_t fsfat_filepath_split(char* filepath, char* parts[], uint32_t num)
+{
+    uint32_t i = 0;
+    int32_t ret = -1;
+    char* z = filepath;
+
+    while (i < num && *z != '\0') {
+        if (*z == '/' ) {
+            *z = '\0';
+            parts[i] = ++z;
+            i++;
+        } else {
+            z++;
+        }
+    }
+    if (*z == '\0' && i > 0) {
+        ret = (int32_t) i;
+    }
+    return ret;
+}
+
+
+/** @brief
+ * remove all directories and file in the given filepath
+ *
+ * ARGUMENTS
+ *  @param  filepath     IN file path string to split into component parts. Expected to start with '/'
+ *
+ * @return  On success, this returns 0, otherwise < 0 is returned;
+ */
+int32_t fsfat_filepath_remove_all(char* filepath)
+{
+    int32_t ret = -1;
+    int32_t len = 0;
+    char *fpathbuf = NULL;
+    char *pos = NULL;
+
+    FSFAT_FENTRYLOG("%s:entered\n", __func__);
+    len = strlen(filepath);
+    fpathbuf = (char*) malloc(len+1);
+    if (fpathbuf == NULL) {
+        FSFAT_DBGLOG("%s: failed to duplicate string (out of memory)\n", __func__);
+        return ret;
+    }
+    memset(fpathbuf, 0, len+1);
+    memcpy(fpathbuf, filepath, len);
+
+    /* delete the leaf node first, and then successively parent directories. */
+    pos = fpathbuf + strlen(fpathbuf);
+    while (pos != fpathbuf) {
+        /* If the remaining file path is the mount point path then finish as the mount point cannot be removed */
+        if (strlen(fpathbuf) == strlen(FSFAT_FOPEN_TEST_MOUNT_PT_PATH) && strncmp(fpathbuf, FSFAT_FOPEN_TEST_MOUNT_PT_PATH, strlen(fpathbuf)) == 0) {
+            break;
+        }
+        ret = remove(fpathbuf);
+        pos = strrchr(fpathbuf, '/');
+        *pos = '\0';
+    }
+    if (fpathbuf) {
+        free(fpathbuf);
+    }
+    return ret;
+}
+
+
+/** @brief
+ * make all directories in the given filepath. Do not create the file if present at end of filepath
+ *
+ * ARGUMENTS
+ *  @param  filepath     IN file path containing directories and file
+ *  @param  do_asserts   IN set to true if function should assert on errors
+ *
+ * @return  On success, this returns 0, otherwise < 0 is returned;
+ */
+static int32_t fsfat_filepath_make_dirs(char* filepath, bool do_asserts)
+{
+    int32_t i = 0;
+    int32_t num_parts = 0;
+    int32_t len = 0;
+    int32_t ret = -1;
+    char *fpathbuf = NULL;
+    char *buf = NULL;
+    int pos = 0;
+    char *parts[FSFAT_FOPEN_TEST_FILEPATH_MAX_DEPTH];
+
+    FSFAT_DBGLOG("%s:entered\n", __func__);
+    /* find the dirs to create*/
+    memset(parts, 0, sizeof(parts));
+    len = strlen(filepath);
+    fpathbuf = (char*) malloc(len+1);
+    if (fpathbuf == NULL) {
+        FSFAT_DBGLOG("%s: failed to duplicate string (out of memory)\n", __func__);
+        return ret;
+    }
+    memset(fpathbuf, 0, len+1);
+    memcpy(fpathbuf, filepath, len);
+    num_parts = fsfat_filepath_split(fpathbuf, parts, FSFAT_FOPEN_TEST_FILEPATH_MAX_DEPTH);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to split filepath (filename=\"%s\", num_parts=%d)\n", __func__, filepath, (int) num_parts);
+    TEST_ASSERT_MESSAGE(num_parts > 0, fsfat_fopen_utest_msg_g);
+
+    /* Now create the directories on the directory path.
+     * Skip creating dir for "/sd" which must be present */
+    buf = (char*) malloc(strlen(filepath)+1);
+    memset(buf, 0, strlen(filepath)+1);
+    pos = sprintf(buf, "/%s", parts[0]);
+    for (i = 1; i < num_parts - 1; i++) {
+        pos += sprintf(buf+pos, "/%s", parts[i]);
+        FSFAT_DBGLOG("mkdir(%s)\n", buf);
+        ret = mkdir(buf, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
+        if (do_asserts == true) {
+            FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to create directory (filepath2=\"%s\", ret=%d, errno=%d)\n", __func__, buf, (int) ret, errno);
+            TEST_ASSERT_MESSAGE(ret == 0, fsfat_fopen_utest_msg_g);
+        }
+    }
+
+    if (buf) {
+        free(buf);
+    }
+    if (fpathbuf) {
+        free(fpathbuf);
+    }
+    return ret;
+}
+
+
+/* FIX ME: errno not set correctly when error occurs. This indicates a problem with the implementation. */
+
+/** @brief
+ * Basic fopen test which does the following:
+ * - creates file and writes some data to the value blob.
+ * - closes the newly created file.
+ * - opens the file (r-only)
+ * - reads the file data and checks its the same as the previously created data.
+ * - closes the opened file
+ *
+ * @return on success returns CaseNext to continue to next test case, otherwise will assert on errors.
+ */
+static control_t fsfat_fopen_test_01(const size_t call_count)
+{
+    char* read_buf;
+    int32_t ret = 0;
+    size_t len = 0;
+    fsfat_kv_data_t *node;
+    FILE *fp = NULL;
+
+    FSFAT_DBGLOG("%s:entered\n", __func__);
+    (void) call_count;
+    node = fsfat_fopen_test_01_kv_data;
+
+    /* remove file and directory from a previous failed test run, if present */
+    fsfat_filepath_remove_all((char*) node->filename);
+
+    /* create dirs */
+    ret = fsfat_filepath_make_dirs((char*) node->filename, true);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to create dirs for filename (filename=\"%s\")(ret=%d)\n", __func__, node->filename, (int) ret);
+    TEST_ASSERT_MESSAGE(ret == 0, fsfat_fopen_utest_msg_g);
+
+    FSFAT_DBGLOG("%s:About to create new file (filename=\"%s\", data=\"%s\")\n", __func__, node->filename, node->value);
+    fp = fopen(node->filename, "w+");
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to create file (filename=\"%s\", data=\"%s\")(ret=%d, errno=%d)\n", __func__, node->filename, node->value, (int) ret, errno);
+    TEST_ASSERT_MESSAGE(fp != NULL, fsfat_fopen_utest_msg_g);
+
+    FSFAT_DBGLOG("%s:length of file=%d (filename=\"%s\", data=\"%s\")\n", __func__, (int) len, node->filename, node->value);
+    len = strlen(node->value);
+    ret = fwrite((const void*) node->value, len, 1, fp);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to write file (filename=\"%s\", data=\"%s\")(ret=%d)\n", __func__, node->filename, node->value, (int) ret);
+    TEST_ASSERT_MESSAGE(ret == 1, fsfat_fopen_utest_msg_g);
+
+    FSFAT_DBGLOG("Created file successfully (filename=\"%s\", data=\"%s\")\n", node->filename, node->value);
+    ret = fclose(fp);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to close file (ret=%d, errno=%d)\n", __func__, (int) ret, errno);
+    TEST_ASSERT_MESSAGE(ret == 0, fsfat_fopen_utest_msg_g);
+
+    /* now open the newly created key */
+    fp = NULL;
+    fp = fopen(node->filename, "r");
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to open file for reading (filename=\"%s\", data=\"%s\")(ret=%d)\n", __func__, node->filename, node->value, (int) ret);
+    TEST_ASSERT_MESSAGE(fp != NULL, fsfat_fopen_utest_msg_g);
+
+    len = strlen(node->value) + 1;
+    read_buf = (char*) malloc(len);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to allocated read buffer \n", __func__);
+    TEST_ASSERT_MESSAGE(read_buf != NULL, fsfat_fopen_utest_msg_g);
+
+    FSFAT_DBGLOG("Opened file successfully (filename=\"%s\", data=\"%s\")\n", node->filename, node->value);
+    memset(read_buf, 0, len);
+    ret = fread((void*) read_buf, len, 1, fp);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to read file (filename=\"%s\", data=\"%s\", read_buf=\"%s\", ret=%d)\n", __func__, node->filename, node->value, read_buf, (int) ret);
+    /* FIX ME: fread should return the number of items read, not 0 when an item is read successfully.
+     * This indicates a problem with the implementation, as the correct data is read. The correct assert should be:
+     *   TEST_ASSERT_MESSAGE(ret == 1, fsfat_fopen_utest_msg_g);
+     * The following assert is curerntly used until the implementation is fixed
+     */
+    TEST_ASSERT_MESSAGE(ret == 0, fsfat_fopen_utest_msg_g);
+
+    /* check read data is as expected */
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: read value data (%s) != expected value data (filename=\"%s\", data=\"%s\", read_buf=\"%s\", ret=%d)\n", __func__, read_buf, node->filename, node->value, read_buf, (int) ret);
+    TEST_ASSERT_MESSAGE(strncmp(read_buf, node->value, strlen(node->value)) == 0, fsfat_fopen_utest_msg_g);
+
+    if(read_buf){
+        free(read_buf);
+    }
+    ret = fclose(fp);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: fclose() call failed (ret=%d, errno=%d).\n", __func__, (int) ret, errno);
+    TEST_ASSERT_MESSAGE(ret == 0, fsfat_fopen_utest_msg_g);
+    return CaseNext;
+}
+
+static fsfat_kv_data_t fsfat_fopen_test_02_data[] = {
+        FSFAT_INIT_1_TABLE_MID_NODE,
+        { NULL, NULL},
+};
+
+/**
+ * @brief   test to fopen() a pre-existing key and try to write it, which should fail
+ *          as by default pre-existing keys are opened read-only
+ *
+ * Basic open test which does the following:
+ * - creates file with default rw perms and writes some data to the value blob.
+ * - closes the newly created file.
+ * - opens the file with the default permissions (read-only)
+ * - tries to write the file data which should fail because file was not opened with write flag set.
+ * - closes the opened key
+ *
+ * @return on success returns CaseNext to continue to next test case, otherwise will assert on errors.
+ */
+control_t fsfat_fopen_test_02(const size_t call_count)
+{
+    int32_t ret = -1;
+    size_t len = 0;
+    FILE *fp = NULL;
+
+    FSFAT_FENTRYLOG("%s:entered\n", __func__);
+    (void) call_count;
+    len = strlen(fsfat_fopen_test_02_data[0].value);
+    ret = fsfat_test_create(fsfat_fopen_test_02_data[0].filename, (char*) fsfat_fopen_test_02_data[0].value, len);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to create file (ret=%d).\n", __func__, (int) ret);
+    TEST_ASSERT_MESSAGE(ret >= 0, fsfat_fopen_utest_msg_g);
+
+    /* by default, owner of key opens with read-only permissions*/
+    fp = fopen(fsfat_fopen_test_02_data[0].filename, "r");
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to open file (filename=\"%s\", ret=%d)\n", __func__, fsfat_fopen_test_02_data[0].filename, (int) ret);
+    TEST_ASSERT_MESSAGE(fp != NULL, fsfat_fopen_utest_msg_g);
+
+    len = strlen(fsfat_fopen_test_02_data[0].value);
+    ret = fwrite((const void*) fsfat_fopen_test_02_data[0].value, len, 1, fp);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: call to fwrite() succeeded when should have failed for read-only file (filename=\"%s\")(ret=%d).\n", __func__, fsfat_fopen_test_02_data[0].filename, (int) ret);
+    TEST_ASSERT_MESSAGE(ret <= 0, fsfat_fopen_utest_msg_g);
+
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: fclose() call failed.\n", __func__);
+    TEST_ASSERT_MESSAGE(fclose(fp) == 0, fsfat_fopen_utest_msg_g);
+
+    return CaseNext;
+}
+
+
+/**
+ * @brief   test to fopen() a pre-existing file and try to write it, which should succeed
+ *          because the key was opened read-write permissions explicitly
+ *
+ * Basic open test which does the following:
+ * - creates file with default rw perms and writes some data to the value blob.
+ * - closes the newly created file.
+ * - opens the file with the rw permissions (non default)
+ * - tries to write the file data which should succeeds because file was opened with write flag set.
+ * - closes the opened key
+ *
+ * @return on success returns CaseNext to continue to next test case, otherwise will assert on errors.
+ */
+control_t fsfat_fopen_test_03(const size_t call_count)
+{
+    int32_t ret = -1;
+    size_t len = 0;
+    FILE *fp = NULL;
+
+    FSFAT_FENTRYLOG("%s:entered\n", __func__);
+    (void) call_count;
+    len = strlen(fsfat_fopen_test_02_data[0].value);
+    ret = fsfat_test_create(fsfat_fopen_test_02_data[0].filename, (char*) fsfat_fopen_test_02_data[0].value, len);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to create file in store (ret=%d).\n", __func__, (int) ret);
+    TEST_ASSERT_MESSAGE(ret >= 0, fsfat_fopen_utest_msg_g);
+
+    /* opens with read-write permissions*/
+    fp = fopen(fsfat_fopen_test_02_data[0].filename, "w+");
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to open file (filename=\"%s\")(ret=%d)\n", __func__, fsfat_fopen_test_02_data[0].filename, (int) ret);
+    TEST_ASSERT_MESSAGE(ret >= 0, fsfat_fopen_utest_msg_g);
+
+    len = strlen(fsfat_fopen_test_02_data[0].value);
+    ret = fwrite((const void*) fsfat_fopen_test_02_data[0].value, len, 1, fp);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: call to fwrite() failed when should have succeeded (filename=\"%s\", ret=%d).\n", __func__, fsfat_fopen_test_02_data[0].filename, (int) ret);
+    TEST_ASSERT_MESSAGE(ret >= 0, fsfat_fopen_utest_msg_g);
+
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: fclose() call failed.\n", __func__);
+    TEST_ASSERT_MESSAGE(fclose(fp) >= 0, fsfat_fopen_utest_msg_g);
+
+    /* clean-up */
+    ret = remove(fsfat_fopen_test_02_data[0].filename);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: unable to delete file (filename=%s, ret=%d) .\n", __func__, fsfat_fopen_test_02_data[0].filename, (int) ret);
+    TEST_ASSERT_MESSAGE(ret >= 0, fsfat_fopen_utest_msg_g);
+
+    return CaseNext;
+}
+
+
+/** @brief  test to call fopen() with a filename string that exceeds the maximum length
+ * - chanFS supports the exFAT format which should support 255 char filenames
+ * - check that filenames of this length can be created
+ *
+ * @return on success returns CaseNext to continue to next test case, otherwise will assert on errors.
+ */
+control_t fsfat_fopen_test_04(const size_t call_count)
+{
+    char filename_good[FSFAT_FILENAME_MAX_LENGTH+1];
+    char filename_bad[FSFAT_FILENAME_MAX_LENGTH+2];
+    int32_t ret = -1;
+    size_t len = 0;
+
+    FSFAT_FENTRYLOG("%s:entered\n", __func__);
+    (void) call_count;
+
+    memset(filename_good, 0, FSFAT_FILENAME_MAX_LENGTH+1);
+    memset(filename_bad, 0, FSFAT_FILENAME_MAX_LENGTH+2);
+    ret = fsfat_test_filename_gen(filename_good, FSFAT_FILENAME_MAX_LENGTH);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: unable to generate filename_good.\n", __func__);
+    TEST_ASSERT_MESSAGE(ret >= 0, fsfat_fopen_utest_msg_g);
+
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: filename_good is not the correct length (filename_good=%s, len=%d, expected=%d).\n", __func__, filename_good, (int) strlen(filename_good), (int) FSFAT_FILENAME_MAX_LENGTH);
+    TEST_ASSERT_MESSAGE(strlen(filename_good) == FSFAT_FILENAME_MAX_LENGTH, fsfat_fopen_utest_msg_g);
+
+    ret = fsfat_test_filename_gen(filename_bad, FSFAT_FILENAME_MAX_LENGTH+1);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: unable to generate filename_bad.\n", __func__);
+    TEST_ASSERT_MESSAGE(ret >= 0, fsfat_fopen_utest_msg_g);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: filename_bad is not the correct length (len=%d, expected=%d).\n", __func__, (int) strlen(filename_bad), (int) FSFAT_FILENAME_MAX_LENGTH+1);
+    TEST_ASSERT_MESSAGE(strlen(filename_bad) == FSFAT_FILENAME_MAX_LENGTH+1, fsfat_fopen_utest_msg_g);
+
+    len = strlen(filename_good);
+    ret = fsfat_test_create(filename_good, filename_good, len);
+    /* FIXME:
+     * The current implementation can create file with a filename with 9 chars (more than the 8 restriction of FAT32 Short File Names).
+     * However, the exFAT 255 char filesnames is not supported and hence the following is commented out. Find out what is
+     * the supported max filename length and change this testcase according.
+     *
+     *  FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to create file (filename=%s, ret=%d).\n", __func__, filename_good, (int) ret);
+     *  TEST_ASSERT_MESSAGE(ret >= 0, fsfat_fopen_utest_msg_g);
+     */
+
+    len = strlen(filename_bad);
+    ret = fsfat_test_create(filename_bad, filename_bad, len);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: created file in store for filename_bad when should have failed (filename=%s, ret=%d).\n", __func__, filename_bad, (int) ret);
+    TEST_ASSERT_MESSAGE(ret < 0, fsfat_fopen_utest_msg_g);
+    return CaseNext;
+}
+
+
+/// @cond FSFAT_DOXYGEN_DISABLE
+typedef struct fsfat_fopen_kv_name_ascii_node {
+    uint32_t code;
+    uint32_t f_allowed : 1;
+} fsfat_fopen_kv_name_ascii_node;
+/// @endcond
+
+static const uint32_t fsfat_fopen_kv_name_ascii_table_code_sentinel_g = 256;
+
+/*@brief    table recording ascii character codes permitted in kv names */
+static fsfat_fopen_kv_name_ascii_node fsfat_fopen_kv_name_ascii_table[] =
+{
+        {0 , true},         /* code 0-33 allowed*/
+        {34, false},        /* '"' not allowed */
+        {35, true},         /* allowed */
+        {42, false},        /* '*' not allowed */
+        {43, true},         /* allowed */
+        {47, false},        /* '/' not allowed */
+        {48, true},         /* allowed */
+        {58, false},        /* ':' not allowed */
+        {59, true},         /* allowed */
+        {60, false},        /* '<' not allowed */
+        {61, true},         /* allowed */
+        {62, false},        /* '?', '>' not allowed */
+        {64, true},         /* allowed */
+        {92, false},        /* '\' not allowed */
+        {93, true},         /* allowed */
+        {124, false},        /* '!' not allowed */
+        {125, true},         /* allowed */
+        {127, false},        /* DEL not allowed */
+        {128, true},         /* allowed */
+        {fsfat_fopen_kv_name_ascii_table_code_sentinel_g, false},       /* sentinel */
+};
+
+
+/// @cond FSFAT_DOXYGEN_DISABLE
+enum fsfat_fopen_kv_name_pos {
+    fsfat_fopen_kv_name_pos_start = 0x0,
+    fsfat_fopen_kv_name_pos_mid,
+    fsfat_fopen_kv_name_pos_end,
+    fsfat_fopen_kv_name_pos_max
+};
+/// @endcond
+
+/** @brief  test to call fopen() with filename that in includes illegal characters
+ *          - the character(s) can be at the beginning of the filename
+ *          - the character(s) can be at the end of the filename
+ *          - the character(s) can be somewhere within the filename string
+ *          - a max-length string of random characters (legal and illegal)
+ *          - a max-length string of random illegal characters only
+ *
+ * @return on success returns CaseNext to continue to next test case, otherwise will assert on errors.
+ */
+control_t fsfat_fopen_test_05(const size_t call_count)
+{
+    bool f_allowed = false;
+    const char *mnt_pt = FSFAT_FOPEN_TEST_MOUNT_PT_PATH;
+    const char *basename = "goodfile";
+    const char *extname = "txt";
+    const size_t basename_len = strlen(basename);
+    const size_t filename_len = strlen(mnt_pt)+strlen(basename)+strlen(extname)+2;  /* extra 2 chars for '/' and '.' in "/sd/goodfile.txt" */
+    char filename[FSFAT_BUF_MAX_LENGTH];
+    size_t len = 0;
+    uint32_t j = 0;
+    int32_t ret = 0;
+    fsfat_fopen_kv_name_ascii_node* node = NULL;
+    uint32_t pos;
+
+    FSFAT_FENTRYLOG("%s:entered\n", __func__);
+    (void) call_count;
+
+#ifdef FSFAT_DEBUG
+    /* symbol only used why debug is enabled */
+    const char* pos_str = NULL;
+#endif
+
+    /* create bad keyname strings with invalid character code at start of keyname */
+    node = fsfat_fopen_kv_name_ascii_table;
+    memset(filename, 0, FSFAT_BUF_MAX_LENGTH);
+    while(node->code !=  fsfat_fopen_kv_name_ascii_table_code_sentinel_g)
+    {
+        /* loop over range */
+        for(j = node->code; j < (node+1)->code; j++)
+        {
+            if( (j >= 48 && j <= 57) || (j >= 65 && j <= 90) || (j >= 97 && j <= 122)) {
+                FSFAT_DBGLOG("%s: skipping alpha-numeric ascii character code %d (%c).\n", __func__, (int) j, (char) j);
+                continue;
+            }
+
+            /* set the start, mid, last character of the name to the test char code */
+            for(pos = (uint32_t) fsfat_fopen_kv_name_pos_start; pos < (uint32_t) fsfat_fopen_kv_name_pos_max; pos++)
+            {
+                len = snprintf(filename, filename_len+1, "%s/%s.%s", mnt_pt, basename, extname);
+                /* overwrite a char at the pos start, mid, end of the filename with an ascii char code (both illegal and legal)*/
+                switch(pos)
+                {
+                case fsfat_fopen_kv_name_pos_start:
+                    filename[5] = (char) j; /* 5 so at to write the second basename char (bad chars as first char not accepted)*/
+                    break;
+                case fsfat_fopen_kv_name_pos_mid:
+                    /* create bad keyname strings with invalid character code in the middle of keyname */
+                    filename[5+basename_len/2] = (char) j;
+                    break;
+                case fsfat_fopen_kv_name_pos_end:
+                    /* create bad keyname strings with invalid character code at end of keyname */
+                    filename[5+basename_len-1] = (char) j;
+                    break;
+                default:
+                    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: unexpected value of pos (pos=%d).\n", __func__, (int) pos);
+                    TEST_ASSERT_MESSAGE(ret >= 0, fsfat_fopen_utest_msg_g);
+                    break;
+                }
+
+#ifdef FSFAT_DEBUG
+                /* processing only required when debug trace enabled */
+                switch(pos)
+                {
+                case fsfat_fopen_kv_name_pos_start:
+                    pos_str = "start";
+                    break;
+                case fsfat_fopen_kv_name_pos_mid:
+                    pos_str = "middle";
+                    break;
+                case fsfat_fopen_kv_name_pos_end:
+                    pos_str = "end";
+                    break;
+                default:
+                    break;
+                }
+#endif
+                ret = fsfat_test_create(filename, (const char*) filename, len);
+
+                /* special cases */
+                switch(j)
+                {
+                //case 0 :
+				//case 46 :
+                //    switch(pos)
+                //    {
+                //    /* for code = 0 (null terminator). permitted at mid and end of string */
+                //    /* for code = 46 ('.'). permitted at mid and end of string but not at start */
+                //    case fsfat_fopen_kv_name_pos_start:
+                //        f_allowed = false;
+                //        break;
+                //    case fsfat_fopen_kv_name_pos_mid:
+                //    case fsfat_fopen_kv_name_pos_end:
+                //    default:
+                //        f_allowed = true;
+                //        break;
+                //    }
+                //    break;
+				default:
+					f_allowed = node->f_allowed;
+					break;
+                }
+                if(f_allowed == true)
+                {
+                    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to create file in store when filename contains valid characters (code=%d, ret=%d).\n", __func__, (int) j, (int) ret);
+                    TEST_ASSERT_MESSAGE(ret >= 0, fsfat_fopen_utest_msg_g);
+                    /* revert FSFAT_LOG for more trace */
+                    FSFAT_DBGLOG("Successfully created a file with valid keyname containing ascii character code %d (%c) at the %s of the keyname.\n", (int) j, (int) j, pos_str);
+                    FSFAT_LOG("%c", '.');
+
+                    ret = fsfat_test_delete(filename);
+                    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to delete file previously created (code=%d, ret=%d).\n", __func__, (int) j, (int) ret);
+                    TEST_ASSERT_MESSAGE(ret >= 0, fsfat_fopen_utest_msg_g);
+                }
+                else
+                {   /*node->f_allowed == false => not allowed to create kv name with ascii code */
+                    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: created file in store when filename contains an invalid character (code=%d, ret=%d).\n", __func__, (int) j, (int) ret);
+                    TEST_ASSERT_MESSAGE(ret < 0, fsfat_fopen_utest_msg_g);
+                    /* revert FSFAT_LOG for more trace */
+                    FSFAT_DBGLOG("Successfully failed to create a file with an invalid keyname containing ascii character code %d at the %s of the keyname.\n", (int) j, pos_str);
+                    FSFAT_LOG("%c", '.');
+                }
+            }
+        }
+        node++;
+    }
+
+    FSFAT_LOG("%c", '\n');
+    return CaseNext;
+}
+
+
+static const char fsfat_fopen_ascii_illegal_buf_g[] = "\"�'*+,./:;<=>?[\\]|";
+
+/** @brief  test to call fopen() with filename that in includes
+ *          illegal characters
+ *          - a max-length string of random illegal characters only
+ *
+ * @return on success returns CaseNext to continue to next test case, otherwise will assert on errors.
+ */
+control_t fsfat_fopen_test_06(const size_t call_count)
+{
+    const char *mnt_pt = FSFAT_FOPEN_TEST_MOUNT_PT_PATH;
+    const char *extname = "txt";
+    const size_t filename_len = strlen(mnt_pt)+FSFAT_MAX_FILE_BASENAME+strlen(extname)+2;  /* extra 2 chars for '/' and '.' in "/sd/goodfile.txt" */
+    char filename[FSFAT_BUF_MAX_LENGTH];
+    int32_t i = 0;
+    int32_t j = 0;
+    uint32_t pos = 0;
+    uint32_t len = 0;
+    int32_t ret = -1;
+    size_t buf_data_max = 0;
+
+    FSFAT_FENTRYLOG("%s:entered\n", __func__);
+    (void) call_count;
+
+    memset(filename, 0, FSFAT_BUF_MAX_LENGTH);
+    /* create bad keyname strings with invalid character code at start of keyname */
+    buf_data_max = strlen(fsfat_fopen_ascii_illegal_buf_g);
+
+    /* generate a number of illegal filenames */
+    for (j = 0; i < FSFAT_MAX_FILE_BASENAME; j++) {
+        /* generate a kv name of illegal chars*/
+        len = snprintf(filename, filename_len+1, "%s/", mnt_pt);
+        for (i = 0; i < FSFAT_MAX_FILE_BASENAME; i++) {
+            pos = rand() % (buf_data_max+1);
+            len += snprintf(filename+len, filename_len+1, "%c", fsfat_fopen_ascii_illegal_buf_g[pos]);
+
+        }
+        len += snprintf(filename+len, filename_len+1, ".%s", extname);
+        ret = fsfat_test_create(filename, filename, len);
+        FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: created file when filename contains invalid characters (filename=%s, ret=%d).\n", __func__, filename, (int) ret);
+        TEST_ASSERT_MESSAGE(ret < 0, fsfat_fopen_utest_msg_g);
+    }
+    return CaseNext;
+}
+
+
+/** @brief  test for errno reporting on a failed fopen()call
+ *
+ *	This test does the following:
+ *	- tries to open a file that does not exist for reading, and checks that a NULL pointer is returned.
+ *	- checks that errno is not 0 as there is an error.
+ *	- checks that ferror() returns 1 indicating an error exists.
+ *
+ * Note: see NOTE_1 below.
+ *
+ * @return on success returns CaseNext to continue to next test case, otherwise will assert on errors.
+ */
+control_t fsfat_fopen_test_07(const size_t call_count)
+{
+	FILE *f = NULL;
+	int ret = -1;
+    int errno_val = 0;
+    const char *filename = sd_badfile_path;
+
+    FSFAT_FENTRYLOG("%s:entered\n", __func__);
+    (void) call_count;
+
+    errno = 0;
+    /* this is expect to fail as the file doesnt exist */
+    f = fopen(filename,"r");
+
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: opened non-existent file for reading (filename=%s, f=%p).\n", __func__, filename, f);
+    TEST_ASSERT_MESSAGE(f == NULL, fsfat_fopen_utest_msg_g);
+
+    /* check errno is set correctly */
+#if ! defined(__ARMCC_VERSION) && defined(__GNUC__)
+    /* Store errno so the current value set  is not changed by new function call */
+    errno_val = errno;
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: errno has unexpected value (errno != 0 expected) (filename=%s, errno=%d).\n", __func__, filename, errno);
+    TEST_ASSERT_MESSAGE(errno_val != 0, fsfat_fopen_utest_msg_g);
+#endif  /* ! defined(__ARMCC_VERSION) && defined(__GNUC__) */
+    return CaseNext;
+}
+
+
+/** @brief  test for operation of clearerr() and ferror()
+ *
+ *  The test does the following:
+ *  - opens and then closes a file, but keeps a copy of the FILE pointer fp.
+ *  - set errno to 0.
+ *  - write to the close file with fwrite(fp) which should return 0 (no writes) and set the errno.
+ *  - check the error condition is set with ferror().
+ *  - clear the error with clearerr().
+ *  - check the error condition is reset with ferror().
+ *
+ * NOTE_1: GCC/ARMCC support for setting errno
+ *  - Documentation (e.g. fwrite() man page) does not explicity say fwrite() sets errno
+ *    (e.g. for an fwrite() on a read-only file).
+ *  - GCC libc fwrite() appears to set errno as expected.
+ *  - ARMCC & IAR libc fwrite() appears not to set errno.
+ *
+ * The following ARMCC documents are silent on whether fwrite() sets errno:
+ * - "ARM C and C++ Libraries and Floating-Point Support".
+ * - "RL-ARM User Guide fwrite() section".
+ *
+ * @return on success returns CaseNext to continue to next test case, otherwise will assert on errors.
+ */
+control_t fsfat_fopen_test_08(const size_t call_count)
+{
+    FILE *fp = NULL;
+    int ret = -1;
+    int ret_ferror = -1;
+    const char *filename = sd_testfile_path;
+
+    FSFAT_FENTRYLOG("%s:entered\n", __func__);
+    (void) call_count;
+
+    errno = 0;
+    fp = fopen(filename,"w+");
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to open file (filename=%s, f=%p).\n", __func__, filename, fp);
+    TEST_ASSERT_MESSAGE(fp != NULL, fsfat_fopen_utest_msg_g);
+
+    /* close the fp but then try to read or write it */
+    ret = fclose(fp);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to close file (ret=%d, errno=%d)\n", __func__, (int) ret, errno);
+    TEST_ASSERT_MESSAGE(ret == 0, fsfat_fopen_utest_msg_g);
+
+    /* open file  */
+    errno = 0;
+    fp = fopen(filename, "r");
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to open file for reading (filename=\"%s\", ret=%d)\n", __func__, filename, (int) ret);
+    TEST_ASSERT_MESSAGE(fp != NULL, fsfat_fopen_utest_msg_g);
+
+    /* Perform fwrite() operation that will fail. */
+    errno = 0;
+    ret = fwrite("42!", 4, 1, fp);
+
+    ret_ferror = ferror(fp);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: ferror() failed to report error (filename=%s, ret_ferror=%d).\n", __func__, filename, (int) ret_ferror);
+    TEST_ASSERT_MESSAGE(ret_ferror != 0, fsfat_fopen_utest_msg_g);
+
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: fwrite successfully wrote to read-only file (filename=%s, ret=%d).\n", __func__, filename, (int) ret);
+    /* the fwrite() should fail and return 0. */
+    TEST_ASSERT_MESSAGE(ret == 0, fsfat_fopen_utest_msg_g);
+
+#if ! defined(__ARMCC_VERSION) && defined(__GNUC__)
+    /* check that errno is set. ARMCC appears not to set errno for fwrite() failure. */
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: unexpected zero value for errno (filename=%s, ret=%d, errno=%d).\n", __func__, filename, (int) ret, errno);
+    TEST_ASSERT_MESSAGE(errno != 0, fsfat_fopen_utest_msg_g);
+
+    /* check that errno is set to the expected value (this may change differ for different libc's) */
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: errno != EBADF (filename=%s, ret=%d, errno=%d).\n", __func__, filename, (int) ret, errno);
+    TEST_ASSERT_MESSAGE(errno == EBADF, fsfat_fopen_utest_msg_g);
+#endif  /* ! defined(__ARMCC_VERSION) && defined(__GNUC__) */
+
+    /* check clearerr() return clears the error */
+    clearerr(fp);
+    ret = ferror(fp);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: ferror() did not return zero value when error has been cleared (filename=%s, ret=%d).\n", __func__, filename, (int) ret);
+    TEST_ASSERT_MESSAGE(ret == 0, fsfat_fopen_utest_msg_g);
+
+    fclose(fp);
+    return CaseNext;
+}
+
+
+/** @brief  test for operation of ftell()
+ *
+ * @return on success returns CaseNext to continue to next test case, otherwise will assert on errors.
+ */
+control_t fsfat_fopen_test_09(const size_t call_count)
+{
+    FILE *fp = NULL;
+    int ret = -1;
+    int32_t len = 0;
+
+    FSFAT_FENTRYLOG("%s:entered\n", __func__);
+    (void) call_count;
+
+    /* create a file of a certain length */
+    len = strlen(fsfat_fopen_test_02_data[0].value);
+    ret = fsfat_test_create(fsfat_fopen_test_02_data[0].filename, (char*) fsfat_fopen_test_02_data[0].value, len);
+
+    errno = 0;
+    /* Open the file for reading so the file is not truncated to 0 length. */
+    fp = fopen(fsfat_fopen_test_02_data[0].filename, "r");
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to open file (filename=%s, fp=%p, errno=%d).\n", __func__, fsfat_fopen_test_02_data[0].filename, fp, errno);
+    TEST_ASSERT_MESSAGE(fp != NULL, fsfat_fopen_utest_msg_g);
+
+    errno = 0;
+    ret = fseek(fp, 0, SEEK_END);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: fseek() failed to SEEK_END (filename=%s, ret=%d, errno=%d).\n", __func__, fsfat_fopen_test_02_data[0].filename, (int) ret, errno);
+    TEST_ASSERT_MESSAGE(ret == 0, fsfat_fopen_utest_msg_g);
+
+    errno = 0;
+    ret = ftell(fp);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: ftell() failed to report correct offset value (filename=%s, ret=%d, errno=%d).\n", __func__, fsfat_fopen_test_02_data[0].filename, (int) ret, errno);
+    TEST_ASSERT_MESSAGE(ret == len, fsfat_fopen_utest_msg_g);
+
+    errno = 0;
+    ret = fclose(fp);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to close file (ret=%d, errno=%d)\n", __func__, (int) ret, errno);
+    TEST_ASSERT_MESSAGE(ret == 0, fsfat_fopen_utest_msg_g);
+
+    return CaseNext;
+}
+
+
+/* file data for test_10 */
+static fsfat_kv_data_t fsfat_fopen_test_10_kv_data[] = {
+        { "/sd/test_10/testfile.txt", "test_data"},
+        { NULL, NULL},
+};
+
+/** @brief  test for operation of remove()
+ *
+ * Performs the following tests:
+ *  1. test remove() on a file that exists. This should succeed.
+ *  2. test remove() on a dir that exists. This should succeed.
+ *  3. test remove() on a file that doesnt exist. This should fail. check errno set.
+ *  4. test remove() on a dir that doesnt exist. This should fail. check errno set.
+ *
+ * @return on success returns CaseNext to continue to next test case, otherwise will assert on errors.
+ */
+control_t fsfat_fopen_test_10(const size_t call_count)
+{
+    char buf[FSFAT_FOPEN_TEST_WORK_BUF_SIZE_1];
+    char *pos = NULL;
+    int32_t ret = -1;
+    size_t len = 0;
+    fsfat_kv_data_t *node = fsfat_fopen_test_10_kv_data;
+
+    FSFAT_FENTRYLOG("%s:entered\n", __func__);
+    (void) call_count;
+
+    TEST_ASSERT(strlen(node->filename) < FSFAT_FOPEN_TEST_WORK_BUF_SIZE_1);
+
+    /* start from a known state i.e. directory to be created in not present */
+    fsfat_filepath_remove_all((char*) node->filename);
+
+    /* (1) */
+    errno = 0;
+    ret = fsfat_filepath_make_dirs((char*) node->filename, false);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to create dir (dirname=%s, ret=%d, errno=%d)\n", __func__, node->filename, (int) ret, errno);
+    TEST_ASSERT_MESSAGE(ret == 0, fsfat_fopen_utest_msg_g);
+
+    len = strlen(node->value);
+    ret = fsfat_test_create(node->filename, (char*) node->value, len);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to create file (ret=%d).\n", __func__, (int) ret);
+    TEST_ASSERT_MESSAGE(ret >= 0, fsfat_fopen_utest_msg_g);
+
+    ret = remove(node->filename);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: delete file operation failed (filename=%s, ret=%d) .\n", __func__, node->filename, (int) ret);
+    TEST_ASSERT_MESSAGE(ret == 0, fsfat_fopen_utest_msg_g);
+
+    /* (3) */
+    ret = remove(node->filename);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: deleted a file that doesn't exist (filename=%s, ret=%d, errno=%d) .\n", __func__, node->filename, (int) ret, errno);
+    TEST_ASSERT_MESSAGE(ret != 0, fsfat_fopen_utest_msg_g);
+
+    /* (2) */
+    memset(buf, 0, FSFAT_FOPEN_TEST_WORK_BUF_SIZE_1);
+    memcpy(buf, node->filename, strlen(node->filename));
+    pos = strrchr(buf, '/');
+    *pos = '\0';
+    ret = remove(buf);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: delete directory operation failed (directory name=%s, ret=%d, errno=%d).\n", __func__, buf, (int) ret, errno);
+    TEST_ASSERT_MESSAGE(ret == 0, fsfat_fopen_utest_msg_g);
+
+    /* (4) */
+    ret = remove(buf);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: deleted a directory that doesn't exist (directory name=%s, ret=%d, errno=%d).\n", __func__, buf, (int) ret, errno);
+    TEST_ASSERT_MESSAGE(ret != 0, fsfat_fopen_utest_msg_g);
+
+    return CaseNext;
+}
+
+
+/* file data for test_11 */
+static fsfat_kv_data_t fsfat_fopen_test_11_kv_data[] = {
+        { "/sd/test_11/step0.txt", "test_data"},
+        { "/sd/test_11/step1.txt", "test_data"},
+        { "/sd/test_11/subdir/step3.txt", "test_data"},
+        { NULL, NULL},
+};
+
+/** @brief  test for operation of rename()
+ *
+ * This test does the following:
+ *  1) test rename() on a file that exists to a new filename within the same directory.
+ *  2) test rename() on a file that exists to a new filename within a different directory.
+ *
+ * @return on success returns CaseNext to continue to next test case, otherwise will assert on errors.
+ */
+control_t fsfat_fopen_test_11(const size_t call_count)
+{
+    int32_t ret = -1;
+    size_t len = 0;
+    fsfat_kv_data_t *node = fsfat_fopen_test_11_kv_data;
+
+    FSFAT_FENTRYLOG("%s:entered\n", __func__);
+    (void) call_count;
+
+    TEST_ASSERT(strlen(node->filename) < FSFAT_FOPEN_TEST_WORK_BUF_SIZE_1);
+
+    /* start from a known state i.e. directory to be created in not present, files not present */
+    while(node->filename != NULL) {
+        fsfat_filepath_remove_all((char*) node->filename);
+        node++;
+    }
+
+    /* create file and directories ready for rename() tests */
+    errno = 0;
+    node = fsfat_fopen_test_11_kv_data;
+    ret = fsfat_filepath_make_dirs((char*) node->filename, false);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to create dir (dirname=%s, ret=%d, errno=%d)\n", __func__, node->filename, (int) ret, errno);
+    TEST_ASSERT_MESSAGE(ret == 0, fsfat_fopen_utest_msg_g);
+
+    len = strlen(node->value);
+    ret = fsfat_test_create(node->filename, (char*) node->value, len);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to create file (ret=%d).\n", __func__, (int) ret);
+    TEST_ASSERT_MESSAGE(ret >= 0, fsfat_fopen_utest_msg_g);
+
+    errno = 0;
+    node = &fsfat_fopen_test_11_kv_data[2];
+    ret = fsfat_filepath_make_dirs((char*) node->filename, false);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to create dir (dirname=%s, ret=%d, errno=%d)\n", __func__, node->filename, (int) ret, errno);
+    TEST_ASSERT_MESSAGE(ret == 0, fsfat_fopen_utest_msg_g);
+
+    /* (1) */
+    ret = rename(fsfat_fopen_test_11_kv_data[0].filename, fsfat_fopen_test_11_kv_data[1].filename);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: unable to rename file from (%s) to (%s) (ret=%d, errno=%d).\n", __func__, fsfat_fopen_test_11_kv_data[0].filename, fsfat_fopen_test_11_kv_data[1].filename, (int) ret, errno);
+    TEST_ASSERT_MESSAGE(ret == 0, fsfat_fopen_utest_msg_g);
+
+    /* (2) */
+    ret = rename(fsfat_fopen_test_11_kv_data[1].filename, fsfat_fopen_test_11_kv_data[2].filename);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: unable to rename file from (%s) to (%s) (ret=%d, errno=%d).\n", __func__, fsfat_fopen_test_11_kv_data[1].filename, fsfat_fopen_test_11_kv_data[2].filename, (int) ret, errno);
+    TEST_ASSERT_MESSAGE(ret == 0, fsfat_fopen_utest_msg_g);
+
+    return CaseNext;
+}
+
+
+/* file data for test_12 */
+static fsfat_kv_data_t fsfat_fopen_test_12_kv_data[] = {
+        { "/sd/test_12/subdir/testfil1.txt", "testfil1.txt"},
+        { "/sd/test_12/testfil2.txt", "testfil2.txt"},
+        { "/sd/test_12/testfil3.txt", "testfil3.txt"},
+        { "/sd/test_12/testfil4.txt", "testfil4.txt"},
+        { "/sd/test_12/testfil5.txt", "testfil5.txt"},
+        { NULL, NULL},
+};
+
+/** @brief  test for operation of readdir().
+ *
+ * Note, rewinddir(), telldir() and seekdir() dont appear to work reliably.
+ * opendir() not available on ARM/IAR toolchains.
+ *
+ * @return on success returns CaseNext to continue to next test case, otherwise will assert on errors.
+ */
+control_t fsfat_fopen_test_12(const size_t call_count)
+{
+    char buf[FSFAT_FOPEN_TEST_WORK_BUF_SIZE_1];
+    char *pos = NULL;
+    int32_t count = 0;
+    int32_t ret = -1;
+    size_t len = 0;
+    DIR *dir;
+    struct dirent *dp;
+    fsfat_kv_data_t *node = fsfat_fopen_test_12_kv_data;
+
+    FSFAT_FENTRYLOG("%s:entered\n", __func__);
+    (void) call_count;
+
+#if ! defined(__ARMCC_VERSION) && defined(__GNUC__)
+
+    /* start from a known state i.e. directory to be created in not present */
+    while(node->filename != NULL) {
+        fsfat_filepath_remove_all((char*) node->filename);
+        node++;
+    }
+
+    /* create a file */
+    node = fsfat_fopen_test_12_kv_data;
+    errno = 0;
+    ret = fsfat_filepath_make_dirs((char*) node->filename, false);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to create dir (dirname=%s, ret=%d, errno=%d)\n", __func__, node->filename, (int) ret, errno);
+    TEST_ASSERT_MESSAGE(ret == 0, fsfat_fopen_utest_msg_g);
+
+    node = fsfat_fopen_test_12_kv_data;
+    while(node->filename != NULL) {
+        len = strlen(node->value);
+        ret = fsfat_test_create(node->filename, (char*) node->value, len);
+        FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to create file (ret=%d).\n", __func__, (int) ret);
+        TEST_ASSERT_MESSAGE(ret >= 0, fsfat_fopen_utest_msg_g);
+        node++;
+    }
+
+    node = fsfat_fopen_test_12_kv_data;
+    memset(buf, 0, FSFAT_FOPEN_TEST_WORK_BUF_SIZE_1);
+    memcpy(buf, node->filename, strlen(node->filename));
+    pos = strrchr(buf, '/');
+    *pos = '\0';
+    dir = opendir(buf);
+
+    dp = readdir(dir);
+    TEST_ASSERT_MESSAGE(dp != 0, "Error: readdir() failed\n");
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: unexpected object name (name=%s, expected=%s).\n", __func__, dp->d_name, ".");
+    TEST_ASSERT_MESSAGE(strncmp(dp->d_name, ".", strlen(".")) == 0, fsfat_fopen_utest_msg_g);
+    dp = readdir(dir);
+    TEST_ASSERT_MESSAGE(dp != 0, "Error: readdir() failed\n");
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: unexpected object name (name=%s, expected=%s).\n", __func__, dp->d_name, "..");
+    TEST_ASSERT_MESSAGE(strncmp(dp->d_name, "..", strlen("..")) == 0, fsfat_fopen_utest_msg_g);
+
+    while ((dp = readdir(dir)) != NULL) {
+        FSFAT_DBGLOG("%s: filename: \"%s\"\n", __func__, dp->d_name);
+        TEST_ASSERT_MESSAGE(dp != 0, "Error: readdir() failed\n");
+        FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: unexpected object name (name=%s, expected=%s).\n", __func__, dp->d_name, fsfat_fopen_test_12_kv_data[count].value);
+        TEST_ASSERT_MESSAGE(strncmp(dp->d_name, fsfat_fopen_test_12_kv_data[count].value, strlen(fsfat_fopen_test_12_kv_data[count].value)) == 0, fsfat_fopen_utest_msg_g);
+        count++;
+    }
+    closedir(dir);
+
+    /* cleanup */
+    node = fsfat_fopen_test_12_kv_data;
+    while(node->filename != NULL) {
+        fsfat_filepath_remove_all((char*) node->filename);
+        node++;
+    }
+#endif  /* ! defined(__ARMCC_VERSION) && defined(__GNUC__) */
+    return CaseNext;
+}
+
+
+/* file data for test_13 */
+static fsfat_kv_data_t fsfat_fopen_test_13_kv_data[] = {
+        /* a file is included in the filepath even though its not created by the test,
+         * as the fsfat_filepath_make_dirs() works with it present. */
+        { "/sd/test_13/dummy.txt", "testdir"},
+        { NULL, NULL},
+};
+/** @brief  test for operation of mkdir()/remove()
+ *
+ * This test checks that:
+ * - The mkdir() function successfully creates a directory that is not already present.
+ * - The mkdir() function returns EEXIST when trying to create a directory thats already present.
+ * - The remove() function successfully removes a directory that is present.
+ *
+ * @return on success returns CaseNext to continue to next test case, otherwise will assert on errors.
+ */
+control_t fsfat_fopen_test_13(const size_t call_count)
+{
+    int32_t ret = 0;
+
+    FSFAT_DBGLOG("%s:entered\n", __func__);
+    (void) call_count;
+
+    /* start from a known state i.e. directory to be created in not present */
+    fsfat_filepath_remove_all((char*) fsfat_fopen_test_13_kv_data[0].filename);
+
+    errno = 0;
+    ret = fsfat_filepath_make_dirs((char*) fsfat_fopen_test_13_kv_data[0].filename, false);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to create dir (dirname=%s, ret=%d, errno=%d)\n", __func__, fsfat_fopen_test_13_kv_data[0].filename, (int) ret, errno);
+    TEST_ASSERT_MESSAGE(ret == 0, fsfat_fopen_utest_msg_g);
+
+    /* check that get a suitable error when try to create it again.*/
+    errno = 0;
+    ret = fsfat_filepath_make_dirs((char*) fsfat_fopen_test_13_kv_data[0].filename, false);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: permitted to create directory when already exists (dirname=%s, ret=%d, errno=%d)\n", __func__, fsfat_fopen_test_13_kv_data[0].filename, (int) ret, errno);
+    TEST_ASSERT_MESSAGE(ret != 0, fsfat_fopen_utest_msg_g);
+
+    /* check errno is as expected */
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: errno != EEXIST (dirname=%s, ret=%d, errno=%d)\n", __func__, fsfat_fopen_test_13_kv_data[0].filename, (int) ret, errno);
+    TEST_ASSERT_MESSAGE(errno == EEXIST, fsfat_fopen_utest_msg_g);
+
+    ret = fsfat_filepath_remove_all((char*) fsfat_fopen_test_13_kv_data[0].filename);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to remove directory (dirname=%s, ret=%d, errno=%d)\n", __func__, fsfat_fopen_test_13_kv_data[0].filename, (int) ret, errno);
+    TEST_ASSERT_MESSAGE(ret == 0, fsfat_fopen_utest_msg_g);
+
+    return CaseNext;
+}
+
+/* file data for test_14 */
+static fsfat_kv_data_t fsfat_fopen_test_14_kv_data[] = {
+        /* a file is included in the filepath even though its not created by the test,
+         * as the fsfat_filepath_make_dirs() works with it present. */
+        { "/sd/test_14/testfile.txt", "testdata"},
+        { NULL, NULL},
+};
+
+/** @brief  test for operation of stat()
+ *
+ * stat() is currently no supported by ARMCC and IAR toolchains libc.
+ *
+ * @return on success returns CaseNext to continue to next test case, otherwise will assert on errors.
+ */
+control_t fsfat_fopen_test_14(const size_t call_count)
+{
+#if ! defined(__ARMCC_VERSION) && defined(__GNUC__)
+
+	char buf[FSFAT_FOPEN_TEST_WORK_BUF_SIZE_1];
+    char *pos = NULL;
+    int32_t ret = -1;
+    size_t len = 0;
+    struct stat file_stat;
+    fsfat_kv_data_t *node = fsfat_fopen_test_14_kv_data;
+
+    FSFAT_FENTRYLOG("%s:entered\n", __func__);
+    (void) call_count;
+
+    TEST_ASSERT(strlen(node->filename) < FSFAT_FOPEN_TEST_WORK_BUF_SIZE_1);
+
+    /* start from a known state i.e. directory to be created in not present */
+    fsfat_filepath_remove_all((char*) node->filename);
+
+    /* Create file in a directory. */
+    errno = 0;
+    ret = fsfat_filepath_make_dirs((char*) node->filename, false);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to create dir (dirname=%s, ret=%d, errno=%d)\n", __func__, node->filename, (int) ret, errno);
+    TEST_ASSERT_MESSAGE(ret == 0, fsfat_fopen_utest_msg_g);
+
+    len = strlen(node->value);
+    ret = fsfat_test_create(node->filename, (char*) node->value, len);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to create file (ret=%d).\n", __func__, (int) ret);
+    TEST_ASSERT_MESSAGE(ret >= 0, fsfat_fopen_utest_msg_g);
+
+    /* Test stat() on the file returns the correct attribute set */
+    memset(&file_stat, 0, sizeof(file_stat));
+    ret = stat(node->filename, &file_stat);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: stat() operation on file failed (filename=%s, ret=%d, errno=%d).\n", __func__, node->filename, (int) ret, errno);
+    TEST_ASSERT_MESSAGE(ret == 0, fsfat_fopen_utest_msg_g);
+
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: expected st_mode S_IFREG flag not set (filename=%s).\n", __func__, node->filename);
+    TEST_ASSERT_MESSAGE((file_stat.st_mode & S_IFREG) == S_IFREG, fsfat_fopen_utest_msg_g);
+
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: unexpected st_mode S_IFDIR flag set (filename=%s).\n", __func__, node->filename);
+    TEST_ASSERT_MESSAGE((file_stat.st_mode & S_IFDIR) != S_IFDIR, fsfat_fopen_utest_msg_g);
+
+    /* Test stat() on the directory returns the correct attribute set */
+    memset(&file_stat, 0, sizeof(file_stat));
+    memset(buf, 0, FSFAT_FOPEN_TEST_WORK_BUF_SIZE_1);
+    memcpy(buf, node->filename, strlen(node->filename));
+    pos = strrchr(buf, '/');
+    *pos = '\0';
+    ret = stat(buf, &file_stat);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: stat() operation on directory failed (directory name=%s, ret=%d, errno=%d).\n", __func__, buf, (int) ret, errno);
+    TEST_ASSERT_MESSAGE(ret == 0, fsfat_fopen_utest_msg_g);
+
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: unexpected st_mode S_IFREG flag set (directory name=%s).\n", __func__, buf);
+    TEST_ASSERT_MESSAGE((file_stat.st_mode & S_IFREG) != S_IFREG, fsfat_fopen_utest_msg_g);
+
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: expected st_mode S_IFDIR flag not set (directory name=%s).\n", __func__, buf);
+    TEST_ASSERT_MESSAGE((file_stat.st_mode & S_IFDIR) == S_IFDIR, fsfat_fopen_utest_msg_g);
+
+    /* clean up after successful test */
+    fsfat_filepath_remove_all((char*) node->filename);
+
+#endif /* ! defined(__ARMCC_VERSION) && defined(__GNUC__) */
+    return CaseNext;
+}
+
+/** @brief  test for operation of SDFileSystem::format()
+ *
+ * @return on success returns CaseNext to continue to next test case, otherwise will assert on errors.
+ */
+control_t fsfat_fopen_test_15(const size_t call_count)
+{
+
+    FSFAT_FENTRYLOG("%s:entered\n", __func__);
+    (void) call_count;
+    int32_t ret = -1;
+
+    /* the allocation_unit of 0 means chanFS will use the default for the card (varies according to capacity). */
+    fs.unmount();
+    ret = fs.format(&sd);
+    FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to format sdcard (ret=%d)\n", __func__, (int) ret);
+    TEST_ASSERT_MESSAGE(ret == 0, fsfat_fopen_utest_msg_g);
+    fs.mount(&sd);
+    return CaseNext;
+}
+
+
+/* @brief   test utility function to create a file of a given size.
+ *
+ * A reference data table is used of so that the data file can be later be
+ * checked with fsfat_test_check_data_file().
+ *
+ * @param   filename    name of the file including path
+ * @param   data        data to store in file
+ * @param   len         number of bytes of data present in the data buffer.
+ */
+int32_t fsfat_test_create_data_file(const char* filename, size_t len)
+{
+    int32_t ret = -1;
+    FILE *fp = NULL;
+    size_t write_len = 0;
+    size_t written_len = 0;
+    int32_t exp = 0;
+    const int32_t exp_max = 8;      /* so as not to exceed FSFAT_TEST_BYTE_DATA_TABLE_SIZE/2 */
+
+    FSFAT_FENTRYLOG("%s:entered (filename=%s, len=%d).\n", __func__, filename, (int) len);
+    TEST_ASSERT(len % FSFAT_TEST_BYTE_DATA_TABLE_SIZE == 0);
+    fp = fopen(filename, "a");
+    if(fp == NULL){
+        return ret;
+    }
+
+    while(written_len < len) {
+        /* write fsfat_test_byte_data_table or part thereof, in 9 writes of sizes
+         * 1, 2, 4, 8, 16, 32, 64, 128, 1, totalling 256 bytes len permitting. */
+        for(exp = 0; (exp <= exp_max) && (written_len < len); exp++){
+            write_len = 0x1 << (exp % exp_max);
+            write_len = len - written_len  > write_len ? write_len : len - written_len;
+            ret = fwrite((const void*) &fsfat_test_byte_data_table[written_len % FSFAT_TEST_BYTE_DATA_TABLE_SIZE], write_len, 1, fp);
+            written_len += write_len;
+            if(ret != 1){
+                FSFAT_DBGLOG("%s:Error: fwrite() failed (ret=%d)\n", __func__, (int) ret);
+                ret = -1;
+                goto out0;
+            }
+        }
+    }
+    if(written_len == len) {
+        ret = 0;
+    } else {
+        ret = -1;
+    }
+out0:
+    fclose(fp);
+    return ret;
+}
+
+
+/* @brief   test utility function to check the data in the specified file is correct.
+ *
+ * The data read from the file is check that it agrees with the data written by
+ * fsfat_test_create_data_file().
+ *
+ * @param   filename    name of the file including path
+ * @param   data        data to store in file
+ * @param   len         number of bytes of data present in the data buffer.
+ */
+int32_t fsfat_test_check_data_file(const char* filename, size_t len)
+{
+    int32_t ret = -1;
+    FILE *fp = NULL;
+    size_t read_len = 0;
+    uint8_t buf[FSFAT_TEST_BYTE_DATA_TABLE_SIZE];
+
+    FSFAT_FENTRYLOG("%s:entered (filename=%s, len=%d).\n", __func__, filename, (int) len);
+    TEST_ASSERT(len % FSFAT_TEST_BYTE_DATA_TABLE_SIZE == 0);
+    fp = fopen(filename, "r");
+    if(fp == NULL){
+        return ret;
+    }
+
+    while(read_len < len) {
+        ret = fread((void*) buf, FSFAT_TEST_BYTE_DATA_TABLE_SIZE, 1, fp);
+        read_len += FSFAT_TEST_BYTE_DATA_TABLE_SIZE;
+        if(ret == 0){
+            /* end of read*/
+            FSFAT_DBGLOG("%s:unable to read data\n", __func__);
+            break;
+        }
+        if(memcmp(buf, fsfat_test_byte_data_table, FSFAT_TEST_BYTE_DATA_TABLE_SIZE) != 0) {
+            FSFAT_DBGLOG("%s:Error: read data not as expected (0x%2x, 0x%2x, 0x%2x, 0x%2x, 0x%2x, 0x%2x, 0x%2x, 0x%2x, 0x%2x, 0x%2x, 0x%2x, 0x%2x, 0x%2x, 0x%2x, 0x%2x, 0x%2x\n", __func__,
+                    buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6], buf[7], buf[8], buf[9], buf[10], buf[11], buf[12], buf[13], buf[14], buf[15]);
+            ret = -1;
+            goto out0;
+        }
+    }
+    if(read_len == len) {
+        ret = 0;
+    }
+out0:
+    fclose(fp);
+    return ret;
+}
+
+/* file data for test_16 */
+static fsfat_kv_data_t fsfat_fopen_test_16_kv_data[] = {
+        { "/sd/tst16_0/testfil0.txt", "dummy_data"},
+        { "/sd/tst16_1/subdir0/testfil0.txt", "dummy_data"},
+        { "/sd/tst16_2/subdir0/subdir1/testfil0.txt", "dummy_data"},
+        { "/sd/tst16_3/subdir0/subdir1/subdir2/subdir3/testfil0.txt", "dummy_data"},
+        { "/sd/tst16_4/subdir0/subdir1/subdir2/subdir3/subdir4/testfil0.txt", "dummy_data"},
+        { "/sd/tst16_5/subdir0/subdir1/subdir2/subdir3/subdir4/subdir5/testfil0.txt", "dummy_data"},
+        { "/sd/tst16_6/subdir0/subdir1/subdir2/subdir3/subdir4/subdir5/subdir6/testfil0.txt", "dummy_data"},
+        { "/sd/tst16_7/subdir0/subdir1/subdir2/subdir3/subdir4/subdir5/subdir6/subdir7/testfil0.txt", "dummy_data"},
+        { "/sd/tst16_8/subdir0/subdir1/subdir2/subdir3/subdir4/subdir5/subdir6/subdir7/subdir8/testfil0.txt", "dummy_data"},
+        { "/sd/tst16_9/subdir0/subdir1/subdir2/subdir3/subdir4/subdir5/subdir6/subdir7/subdir8/subdir9/testfil0.txt", "dummy_data"},
+        { NULL, NULL},
+};
+
+
+/** @brief  stress test to write data to fs
+ *
+ * @return on success returns CaseNext to continue to next test case, otherwise will assert on errors.
+ */
+control_t fsfat_fopen_test_16(const size_t call_count)
+{
+    int32_t ret = 0;
+    fsfat_kv_data_t *node = fsfat_fopen_test_16_kv_data;
+    const int32_t num_blocks = 100; /* each file ~25kB */
+
+    FSFAT_DBGLOG("%s:entered\n", __func__);
+    (void) call_count;
+
+    /* remove file and directory from a previous failed test run, if present */
+    while(node->filename != NULL) {
+        fsfat_filepath_remove_all((char*) node->filename);
+        node++;
+    }
+
+    /* create dirs */
+    node = fsfat_fopen_test_16_kv_data;
+    while(node->filename != NULL) {
+        ret = fsfat_filepath_make_dirs((char*) node->filename, true);
+        FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to create dirs for filename (filename=\"%s\")(ret=%d)\n", __func__, node->filename, (int) ret);
+        TEST_ASSERT_MESSAGE(ret == 0, fsfat_fopen_utest_msg_g);
+        node++;
+    }
+
+    /* create the data files */
+    node = fsfat_fopen_test_16_kv_data;
+    while(node->filename != NULL) {
+        ret = fsfat_test_create_data_file(node->filename, num_blocks * FSFAT_TEST_BYTE_DATA_TABLE_SIZE);
+        FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to create data file (filename=\"%s\")(ret=%d)\n", __func__, node->filename, (int) ret);
+        TEST_ASSERT_MESSAGE(ret == 0, fsfat_fopen_utest_msg_g);
+        node++;
+    }
+
+    /* read the data back and check its as expected */
+    node = fsfat_fopen_test_16_kv_data;
+    while(node->filename != NULL) {
+        ret = fsfat_test_check_data_file(node->filename, num_blocks * FSFAT_TEST_BYTE_DATA_TABLE_SIZE);
+        FSFAT_TEST_UTEST_MESSAGE(fsfat_fopen_utest_msg_g, FSFAT_UTEST_MSG_BUF_SIZE, "%s:Error: failed to check data file (filename=\"%s\")(ret=%d)\n", __func__, node->filename, (int) ret);
+        TEST_ASSERT_MESSAGE(ret == 0, fsfat_fopen_utest_msg_g);
+        node++;
+    }
+
+    /* clean up */
+    node = fsfat_fopen_test_16_kv_data;
+    while(node->filename != NULL) {
+        fsfat_filepath_remove_all((char*) node->filename);
+        node++;
+    }
+    return CaseNext;
+}
+
+
+#else
+
+
+#define FSFAT_FOPEN_TEST_01      fsfat_fopen_test_dummy
+#define FSFAT_FOPEN_TEST_02      fsfat_fopen_test_dummy
+#define FSFAT_FOPEN_TEST_03      fsfat_fopen_test_dummy
+#define FSFAT_FOPEN_TEST_04      fsfat_fopen_test_dummy
+#define FSFAT_FOPEN_TEST_05      fsfat_fopen_test_dummy
+#define FSFAT_FOPEN_TEST_06      fsfat_fopen_test_dummy
+#define FSFAT_FOPEN_TEST_07      fsfat_fopen_test_dummy
+#define FSFAT_FOPEN_TEST_08      fsfat_fopen_test_dummy
+#define FSFAT_FOPEN_TEST_09      fsfat_fopen_test_dummy
+#define FSFAT_FOPEN_TEST_10      fsfat_fopen_test_dummy
+#define FSFAT_FOPEN_TEST_11      fsfat_fopen_test_dummy
+#define FSFAT_FOPEN_TEST_12      fsfat_fopen_test_dummy
+#define FSFAT_FOPEN_TEST_13      fsfat_fopen_test_dummy
+#define FSFAT_FOPEN_TEST_14      fsfat_fopen_test_dummy
+#define FSFAT_FOPEN_TEST_15      fsfat_fopen_test_dummy
+#define FSFAT_FOPEN_TEST_16      fsfat_fopen_test_dummy
+#define FSFAT_FOPEN_TEST_17      fsfat_fopen_test_dummy
+#define FSFAT_FOPEN_TEST_18      fsfat_fopen_test_dummy
+#define FSFAT_FOPEN_TEST_19      fsfat_fopen_test_dummy
+#define FSFAT_FOPEN_TEST_20      fsfat_fopen_test_dummy
+#define FSFAT_FOPEN_TEST_21      fsfat_fopen_test_dummy
+#define FSFAT_FOPEN_TEST_22      fsfat_fopen_test_dummy
+#define FSFAT_FOPEN_TEST_23      fsfat_fopen_test_dummy
+#define FSFAT_FOPEN_TEST_24      fsfat_fopen_test_dummy
+#define FSFAT_FOPEN_TEST_25      fsfat_fopen_test_dummy
+#define FSFAT_FOPEN_TEST_26      fsfat_fopen_test_dummy
+#define FSFAT_FOPEN_TEST_27      fsfat_fopen_test_dummy
+#define FSFAT_FOPEN_TEST_28      fsfat_fopen_test_dummy
+#define FSFAT_FOPEN_TEST_29      fsfat_fopen_test_dummy
+#define FSFAT_FOPEN_TEST_30      fsfat_fopen_test_dummy
+
+/** @brief  fsfat_fopen_test_dummy    Dummy test case for testing when platform doesnt have an SDCard installed.
+ *
+ * @return success always
+ */
+static control_t fsfat_fopen_test_dummy()
+{
+    printf("Null test\n");
+    return CaseNext;
+}
+
+#endif  /* defined(DEVICE_SPI) && defined(MBED_CONF_APP_FSFAT_SDCARD_INSTALLED) */
+
+
+/// @cond FSFAT_DOXYGEN_DISABLE
+utest::v1::status_t greentea_setup(const size_t number_of_cases)
+{
+    GREENTEA_SETUP(FSFAT_FOPEN_GREENTEA_TIMEOUT_S, "default_auto");
+    return greentea_test_setup_handler(number_of_cases);
+}
+
+Case cases[] = {
+           /*          1         2         3         4         5         6        7  */
+           /* 1234567890123456789012345678901234567890123456789012345678901234567890 */
+        Case("FSFAT_FOPEN_TEST_01: fopen()/fwrite()/fclose() directories/file in multi-dir filepath.", FSFAT_FOPEN_TEST_01),
+        Case("FSFAT_FOPEN_TEST_02: fopen(r) pre-existing file try to write it.", FSFAT_FOPEN_TEST_02),
+        Case("FSFAT_FOPEN_TEST_03: fopen(w+) pre-existing file try to write it.", FSFAT_FOPEN_TEST_03),
+        Case("FSFAT_FOPEN_TEST_04: fopen() with a filename exceeding the maximum length.", FSFAT_FOPEN_TEST_04),
+#ifdef FOPEN_EXTENDED_TESTING
+        Case("FSFAT_FOPEN_TEST_05: fopen() with bad filenames (extended).", FSFAT_FOPEN_TEST_05),
+#endif
+        Case("FSFAT_FOPEN_TEST_06: fopen() with bad filenames (minimal).", FSFAT_FOPEN_TEST_06),
+        Case("FSFAT_FOPEN_TEST_07: fopen()/errno handling.", FSFAT_FOPEN_TEST_07),
+        Case("FSFAT_FOPEN_TEST_08: ferror()/clearerr()/errno handling.", FSFAT_FOPEN_TEST_08),
+        Case("FSFAT_FOPEN_TEST_09: ftell() handling.", FSFAT_FOPEN_TEST_09),
+        Case("FSFAT_FOPEN_TEST_10: remove() test.", FSFAT_FOPEN_TEST_10),
+        Case("FSFAT_FOPEN_TEST_11: rename().", FSFAT_FOPEN_TEST_11),
+        Case("FSFAT_FOPEN_TEST_12: opendir(), readdir(), closedir() test.", FSFAT_FOPEN_TEST_12),
+        Case("FSFAT_FOPEN_TEST_13: mkdir() test.", FSFAT_FOPEN_TEST_13),
+        Case("FSFAT_FOPEN_TEST_14: stat() test.", FSFAT_FOPEN_TEST_14),
+        Case("FSFAT_FOPEN_TEST_15: format() test.", FSFAT_FOPEN_TEST_15),
+        Case("FSFAT_FOPEN_TEST_16: write/check n x 25kB data files.", FSFAT_FOPEN_TEST_16),
+};
+
+
+/* Declare your test specification with a custom setup handler */
+Specification specification(greentea_setup, cases);
+
+int main()
+{
+    return !Harness::run(specification);
+}
+/// @endcond