Move black to YAML, not pytest

.github/workflows/test.yml

@@ -36,6 +36,8 @@ jobs:
     - name: Install docs dependencies
       run: |
         pip install -e '.[docs]'
+    - name: Black
+      run: black --check .
     - name: Check if cog needs to be run
       run: |
         cog --check docs/*.rst

tests/test_black.py

@@ -1,11 +0,0 @@
-import black
-from click.testing import CliRunner
-from pathlib import Path
-
-code_root = Path(__file__).parent.parent
-
-
-def test_black():
-    runner = CliRunner()
-    result = runner.invoke(black.main, [str(code_root), "--check"])
-    assert result.exit_code == 0, result.output