MICROPY_LONGINT_IMPL_LONGLONG doesn't have overflow detection, so just
parsing a large number won't give an error, we need to print it out
to check that the whole number was parsed.

Tests which don't work with small ints are suffixed with _intbig.py. Some
of these may still work with long long ints and need to be reclassified
later.

Big aka arbitrary-precision integers (implemented by MPZ module) are used
in tests starting with "int_big_" or ending with "_intbig".

This allows using the test runner for other scenarios than just
testing uPy itself.
The principle of comparing either to CPython or else to a .exp
file is really handy but to be able to test custom modules not
built into micropython.exe one needs to be able to specify the
module search path a.k.a MICROPYPATH.

Fixes #2806.

If sets are not enabled, set literals lead to SyntaxError during parsing,
so it requires feature_check. Set tests are skipped based on set_*.py
pattern.

The native emitter doesn't provide proper traceback info so this test
should not be run in that case.

It now works.

The output might contain more than one line ending in 5b so properly skip
everything until the next known point.
This fixes test failures in appveyor debug builds.

Disabled until a proper fix is found.

With mpy-cross built, tests can now be run by first compiling them to .mpy
files, and then executing the .mpy file.  Usage: ./run-tests --via-mpy

The showbc function now no longer uses the system printf so works
correctly.

It has reliability issues (cause unknown at this time).

It has reliability issues (cause unknown at this time).

It has reliability issues and sometimes fails on Travis (reason currently
unknown).

It has reliability issues that need to be worked out.

Required to pass bytes_compare3.py (opptional warnings) on devices.

This may produce a warning, depending on MicroPython configuration.

They will fail because the GIL is disabled on the unix build.

To get consistent error messages, etc.

Just as the rest of generator tests, which aren't yet supoorted for
native.

This allows you to specify the heapsize that unix will use when running
the test suite, eg: ./run-tests --heapsize 16k

Now, all output has newlines converted to \n, regardless of port or
platform.