Diff: libraries/tests/mbed/dev_null/main.cpp

Revision:

0:6c56fb4bc5f0

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libraries/tests/mbed/dev_null/main.cpp	Fri Nov 04 20:27:58 2016 +0000
@@ -0,0 +1,30 @@
+#include "mbed.h"
+#include "test_env.h"
+
+class DevNull : public Stream {
+public:
+    DevNull(const char *name = NULL) : Stream(name) {}
+
+protected:
+    virtual int _getc() {
+        return 0;
+    }
+    virtual int _putc(int c) {
+        return c;
+    }
+};
+
+DevNull null("null");
+
+int main() {
+    MBED_HOSTTEST_TIMEOUT(20);
+    MBED_HOSTTEST_SELECT(dev_null_auto);
+    MBED_HOSTTEST_DESCRIPTION(stdout redirected to dev null);
+    MBED_HOSTTEST_START("EXAMPLE_1");
+    
+    printf("MBED: re-routing stdout to /null\r\n");
+    freopen("/null", "w", stdout);
+    printf("MBED: printf redirected to /null\r\n");   // This shouldn't appear
+    // If failure message can be seen test should fail :)
+    MBED_HOSTTEST_RESULT(false);   // This is 'false' on purpose
+}