test: style: fix black ignoring integration_test/build directory

When `black` is passed multiple directories, it will try to look for
`pyproject.toml` in the common ancestor of those paths. In our cases,
since we pass it `tests`, `.buildkite` and `tools`, that would be the
repository root. However, our pyproject.toml sits in `tests`, and thus
the `exclude` rule it defines is ignored (and it is this `exclude` rules
that overwrites the default behavior of excluding directories called
`build`).

Fix this by explicitly passing in a `--config` argument. Since `isort`
does not support this argument, pass it in a quite ugly via by adding it
to the pytest parameters.

Fixes: 4f55e49
Signed-off-by: Patrick Roy <[email protected]>

Author: roypat

tests/integration_tests/style/test_python.py

@@ -8,7 +8,7 @@
 import pytest
 
 
-@pytest.mark.parametrize("formatter", ["black", "isort"])
+@pytest.mark.parametrize("formatter", ["black --config tests/pyproject.toml", "isort"])
 def test_python_style(formatter):
     """
     Test that python code passes `formatter`