test(linux_client): add mTLS client certificate handling test in test_linux_client.py

tests/test_linux_client.py

@@ -198,6 +198,31 @@ class TestLinuxClientComponent(unittest.TestCase):
         self.assertEqual(logs[0]["__CURSOR"], "c3")
         self.assertEqual(newest_cursor, "c4")
 
+    def test_mtls_client_certificate_handling(self):
+        import shutil
+        test_dir = "test_linux_mtls_certs"
+        os.makedirs(test_dir, exist_ok=True)
+        try:
+            from src import server_enrollment as se
+            ca_cert, ca_key, ca_pem, _ = se.generate_ca_if_needed(test_dir)
+            client_cert_pem, client_key_pem = se.issue_client_cert("linux-client-test", ca_cert, ca_key)
+
+            with open(os.path.join(test_dir, "ca.crt"), "w") as f:
+                f.write(ca_pem)
+            with open(os.path.join(test_dir, "client.crt"), "w") as f:
+                f.write(client_cert_pem)
+            with open(os.path.join(test_dir, "client.key"), "w") as f:
+                f.write(client_key_pem)
+
+            # Test missing certs exception
+            empty_dir = "test_empty_linux_certs"
+            os.makedirs(empty_dir, exist_ok=True)
+            with self.assertRaises(FileNotFoundError):
+                Linux_Client.get_tls_socket("127.0.0.1", 9443, empty_dir)
+            shutil.rmtree(empty_dir, ignore_errors=True)
+        finally:
+            shutil.rmtree(test_dir, ignore_errors=True)
+
 
 if __name__ == "__main__":
     unittest.main()