diff --git a/pre_commit_hooks/forbid_articles_in_test_filenames.py b/pre_commit_hooks/forbid_articles_in_test_filenames.py
new file mode 100755
index 0000000..1a800bc
--- /dev/null
+++ b/pre_commit_hooks/forbid_articles_in_test_filenames.py
@@ -0,0 +1,48 @@
+#!/usr/bin/env python3
+
+import subprocess
+import sys
+from pathlib import Path
+
+FORBIDDEN = {"a", "an", "the"}
+
+
+def git_ls_python_files():
+    result = subprocess.run(
+        ["git", "ls-files", "*.py"],
+        capture_output=True,
+        text=True,
+        check=True,
+    )
+    return [Path(p) for p in result.stdout.splitlines()]
+
+
+def is_test_file(path: Path) -> bool:
+    name = path.name
+    return (
+        name.startswith("test_")
+        or name.startswith("tests_")
+        or name.endswith("_test.py")
+    )
+
+
+def has_forbidden_article(path: Path) -> bool:
+    parts = path.stem.split("_")
+    return any(part in FORBIDDEN for part in parts)
+
+
+def main() -> int:
+    for path in git_ls_python_files():
+        if not is_test_file(path):
+            continue
+
+        if has_forbidden_article(path):
+            print("ERROR: Forbidden article in test filename:")
+            print(path)
+            return 1
+
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())
diff --git a/tests/test_forbid_articles_in_test_filenames.py b/tests/test_forbid_articles_in_test_filenames.py
new file mode 100644
index 0000000..95a0b9d
--- /dev/null
+++ b/tests/test_forbid_articles_in_test_filenames.py
@@ -0,0 +1,56 @@
+import subprocess
+import sys
+from pathlib import Path
+
+
+HOOK = Path(__file__).parents[1] / "pre_commit_hooks" / "forbid_articles_in_test_filenames.py"
+
+
+def run_hook(repo_path: Path):
+    """Run the hook in a temporary git repo and return (exit_code, stdout)."""
+    result = subprocess.run(
+        [sys.executable, str(HOOK)],
+        cwd=repo_path,
+        capture_output=True,
+        text=True,
+    )
+    return result.returncode, result.stdout.strip()
+
+
+def init_git_repo(tmp_path: Path):
+    subprocess.run(["git", "init"], cwd=tmp_path, check=True)
+    subprocess.run(["git", "config", "user.email", "test@example.com"], cwd=tmp_path, check=True)
+    subprocess.run(["git", "config", "user.name", "Test User"], cwd=tmp_path, check=True)
+
+
+def git_add_all(tmp_path: Path):
+    subprocess.run(["git", "add", "."], cwd=tmp_path, check=True)
+
+
+def test_fails_on_forbidden_article_in_test_filename(tmp_path: Path):
+    init_git_repo(tmp_path)
+
+    bad_test = tmp_path / "tests_create_an_address.py"
+    bad_test.write_text("def test_something(): pass\n")
+
+    git_add_all(tmp_path)
+
+    code, output = run_hook(tmp_path)
+
+    assert code == 1
+    assert "ERROR: Forbidden article in test filename:" in output
+    assert "tests_create_an_address.py" in output
+
+
+def test_passes_on_valid_test_filename(tmp_path: Path):
+    init_git_repo(tmp_path)
+
+    good_test = tmp_path / "tests_create_address.py"
+    good_test.write_text("def test_something(): pass\n")
+
+    git_add_all(tmp_path)
+
+    code, output = run_hook(tmp_path)
+
+    assert code == 0
+    assert output == ""
\ No newline at end of file