test: added a license test

tests/test_license.py

@@ -0,0 +1,14 @@
+"""Tests for license."""
+import os
+
+
+def test_license_present():
+    """Test that the MIT license is present in the header of each module file."""
+    for path, _, files in os.walk("src/keycloak"):
+        for _file in files:
+            if _file.endswith(".py"):
+                with open(os.path.join(path, _file), "r") as fp:
+                    content = fp.read()
+                assert content.startswith(
+                    "# -*- coding: utf-8 -*-\n#\n# The MIT License (MIT)\n#\n#"
+                )