Demonstrate issue with typographic apostrophe U+2019 (’)

We miss misspellings using the typographic apostrophe or acute accent
U+2019 (’) because the typos in our dictionaries use the typewriter
apostrophe U+0027 (').

codespell_lib/tests/test_basic.py

@@ -159,6 +159,19 @@ def test_basic(
     assert cs.main(tmp_path) == 0
 
 
+def test_default_word_parsing(
+    tmp_path: Path,
+    capsys: pytest.CaptureFixture[str],
+) -> None:
+    fname = tmp_path / "apostrophe"
+    with fname.open("a") as f:
+        f.write("`woudn't`\n")  # ' is U+0027
+    assert cs.main(fname) == 1, "misspelling containing typewriter apostrophe U+0027"
+    with fname.open("a") as f:
+        f.write("`woudn’t`\n")  # ’ is U+2019
+    assert cs.main(fname) == 2, "misspelling containing typographic apostrophe U+2019"
+
+
 def test_bad_glob(
     tmp_path: Path,
     capsys: pytest.CaptureFixture[str],