A COMMON folder allows code reuse across different test cases. This
avoids code duplication or code enterying the application space.
The COMMON folder is uppercase to match naming conventions in Mbed OS.
Not all devices have enough heap to fit a simulated heap block device,
however using a simulated heap block device is preferred if available
(reduced flash wear, faster testing).
Added MBED_TEST_SIM_BLOCKDEVICE for tests that only need a simulated
block device (wear_leveling + resilience), and added support for targets
that are known to have enough heap.
Unfortunately there are several issues colluding to force the timeout
this high.
1. The tests push littlefs to the limits of how many errors it can
handle before failing. As a side effect this causes a massive amount
of debug/warn/error logging about the situation.
2. The logging can't be turned off for specific tests. Note: This might
change with the introduction of test-configs.
3. Logging is fixed to a baud rate of 9600. Previous testing was carried
out with a baud rate of 115200, which is the reason for the original
timeout.
Christopher Haster