tester: add unit tests iteration 1

test_hello.py

@@ -0,0 +1,29 @@
+import subprocess
+import unittest
+
+
+class TestHello(unittest.TestCase):
+    def test_hello_output(self):
+        """Test that hello.py prints 'Hello, World!' to stdout."""
+        result = subprocess.run(
+            ["python3", "hello.py"],
+            capture_output=True,
+            text=True,
+            cwd="/workspace"
+        )
+        self.assertEqual(result.returncode, 0)
+        self.assertIn("Hello, World!", result.stdout)
+
+    def test_hello_no_stderr(self):
+        """Test that hello.py produces no stderr output."""
+        result = subprocess.run(
+            ["python3", "hello.py"],
+            capture_output=True,
+            text=True,
+            cwd="/workspace"
+        )
+        self.assertEqual(result.stderr, "")
+
+
+if __name__ == "__main__":
+    unittest.main()