File content as of revision 0:02dd72d1d465:

from __future__ import print_function
import sys
import re
import time
import mido
from mido import Message


def test_midi_in(port):
	expected_messages_count=0
	while expected_messages_count < 7:
		for message in port.iter_pending():
			if message.type in ('note_on', 'note_off', 'program_change', 'sysex'):
				yield message
				expected_messages_count+=1
		time.sleep(0.1)

def test_midi_loopback(input_port):
	expected_messages_count=0
	while expected_messages_count < 1:
		for message in input_port.iter_pending():
			print('Test MIDI OUT loopback received {}'.format(message.hex()))
			expected_messages_count+=1

def test_midi_out_loopback(output_port,input_port):
	print("Test MIDI OUT loopback")
	output_port.send(Message('program_change', program=1))
	test_midi_loopback(input_port)

	output_port.send(Message('note_on', note=21))
	test_midi_loopback(input_port)

	output_port.send(Message('note_off', note=21))
	test_midi_loopback(input_port)

	output_port.send(Message('sysex', data=[0x7E,0x7F,0x09,0x01]))
	test_midi_loopback(input_port)

	output_port.send(Message('sysex', data=[0x7F,0x7F,0x04,0x01,0x7F,0x7F]))
	test_midi_loopback(input_port)

	output_port.send(Message('sysex', data=[0x41,0x10,0x42,0x12,0x40,0x00,0x7F,0x00,0x41]))
	test_midi_loopback(input_port)

	output_port.send(Message('sysex', data=[0x41,0x10,0x42,0x12,0x40,0x00,0x04,0x7F,0x3D]))
	test_midi_loopback(input_port)

portname=""

while portname=="":
	print("Wait for MIDI IN plug ...")
	for name in mido.get_input_names():
		matchObj = re.match( r'Mbed', name)

		if matchObj:
			portname=name
	time.sleep( 1 )

try:
	input_port = mido.open_input(portname)
	output_port = mido.open_output(portname)
	
	print('Using {}'.format(input_port))

	print("Test MIDI IN")

	for message in test_midi_in(input_port):
		print('Test MIDI IN received {}'.format(message.hex()))

	test_midi_out_loopback(output_port,input_port)
except KeyboardInterrupt:
    pass