This adds the Python files in the tests/ directory to be formatted with
./tools/codeformat.py. The basics/ subdirectory is excluded for now so we
aren't changing too much at once.
In a few places `# fmt: off`/`# fmt: on` was used where the code had
special formatting for readability or where the test was actually testing
the specific formatting.
This test just tests that the basic functions/methods can be called with
the appropriate arguments. There is no real test of underlying
functionality.
Thanks to @hosaka for the initial implementation of this test.
