feat: add a simple HTML check pre-commit hook

tests/check_html_test.py

@@ -0,0 +1,20 @@
+from __future__ import annotations
+
+import pytest
+
+from pre_commit_hooks.check_html import main
+from testing.util import get_resource_path
+
+
+@pytest.mark.parametrize(
+    ('filename', 'expected_retval'), (
+        ('bad_html_not_closed.html', 1),
+        ('bad_html_too_many_close.html', 1),
+        ('bad_html_wrong_close.html', 1),
+        ('ok_html_fragment.html', 0),
+        ('ok_html_page.html', 0),
+    ),
+)
+def test_main(filename, expected_retval):
+    ret = main([get_resource_path(filename)])
+    assert ret == expected_retval