Update test_main.py

test/test_main.py

@@ -2,23 +2,25 @@
 from sys import version_info
 from warnings import filterwarnings
 
+import pytest
+
+from puremagic.main import PureError, what
+
+filterwarnings("ignore", category=DeprecationWarning, module="imghdr")
 try:  # imghdr was removed from the standard library in Python 3.13
-    filterwarnings("ignore", category=DeprecationWarning)
     from imghdr import what as imghdr_what
 except ModuleNotFoundError:
     imghdr_what = None
 
-import pytest
-
-from puremagic.main import PureError, what
-
-files = "bmp exr gif jpg pbm pgm png ppm ras rgb tif webp xbm".split()
-files = "bmp gif jpg png tif webp".split()  # TODO: (cclauss) Add the remaining files
+# file_tests = sorted(test_func.__name__[5:] for test_func in imghdr.tests)
+# file_tests = "bmp exr gif jpg pbm pgm png ppm ras rgb tif webp xbm".split()
+file_tests = "bmp gif jpg png tif webp".split()  # TODO: (cclauss) Add the remaining files
 
 
 @pytest.mark.skipif(imghdr_what is None, reason="imghdr was removed from the standard library in Python 3.13")
-@pytest.mark.parametrize("file", files)
+@pytest.mark.parametrize("file", file_tests)
 def test_what_from_file(file, h=None):
+    """Run each test with a path string and a pathlib.Path."""
     file = f"test/resources/images/test.{file}"
     assert what(file, h) == imghdr_what(file, h)
     file = Path(file).resolve()
@@ -68,7 +70,7 @@ def test_what_from_file(file, h=None):
 @pytest.mark.skipif(imghdr_what is None, reason="imghdr was removed from the standard library in Python 3.13")
 @pytest.mark.parametrize("expected, h", string_tests)
 def test_what_from_string(expected, h):
-    if isinstance(h, str):
+    if isinstance(h, str):  # In imgdir.what() h must be bytes, not str.
         h = bytes.fromhex(h)
     assert imghdr_what(None, h) == what(None, h) == expected
 
@@ -86,7 +88,7 @@ def test_what_from_string_py311(expected, h):
     These tests fail with imghdr on Python < 3.11.
     TODO: (cclauss) Document these imghdr fails on Python < 3.11
     """
-    if isinstance(h, str):
+    if isinstance(h, str):  # In imgdir.what() h must be bytes, not str.
         h = bytes.fromhex(h)
     assert what(None, h) == expected
     if version_info < (3, 11):  # TODO: Document these imghdr fails