tests: fix black checking on tests

tests/test_style.py

@@ -84,6 +84,8 @@ class TestStyle(unittest.TestCase):
             "-l",
             "79",
             "--check",
+            "--exclude",
+            '"/(\.eggs|\.git|\.hg|\.mypy_cache|\.nox|\.tox|\.venv|_build|buck-out|build|dist)/"',
             REPO_PATH,
             TESTS_PATH,
         ]