fixup! Create new test suite based on test data

pelican/plugins/tailwindcss/test_tailwindcss.py

@@ -29,6 +29,7 @@ def test_generate_tailwind_css(tmp_path_factory):
     input_file_path = datadir / "input.css"
     twconfig_file_path = datadir / "tailwind.config.js"
 
+    assert datadir.is_dir()
     assert twconfig_file_path.exists()
 
     build_tailwind_css(prefix, input_file_path, output_file_path, twconfig_file_path)