gh-131178: Add tests for this command-line interface

Author: tangyuan0821

Lib/test/test_this.py

@@ -0,0 +1,16 @@
+import unittest
+
+from test.support import requires_subprocess
+from test.support.script_helper import assert_python_ok
+
+
+@requires_subprocess()
+class CommandLineTest(unittest.TestCase):
+    def test_this_module(self):
+        rc, stdout, stderr = assert_python_ok('-m', 'this')
+        self.assertEqual(rc, 0)
+        self.assertIn(b'The Zen of Python', stdout)
+
+
+if __name__ == "__main__":
+    unittest.main()

Misc/NEWS.d/next/Tests/2026-06-21-17-30-00.gh-issue-131178.this.rst

@@ -0,0 +1 @@
+Add tests for ``this`` command-line interface.