tests/integration: Automate manual 'nets_test3' test

Signed-off-by: Monika Kairaityte <monika@kibit.lt>

tests/integration/nets_test3/docker-compose.yml

@@ -41,5 +41,5 @@ services:
           aliases:
           - alias21
       volumes:
-        - ./test2.txt:/var/www/html/index.txt:ro,z
+        - ./test3.txt:/var/www/html/index.txt:ro,z
 

tests/integration/nets_test3/test3.txt

@@ -0,0 +1 @@
+test3

tests/integration/nets_test3/test_podman_compose_nets_test3.py

@@ -0,0 +1,68 @@
+# SPDX-License-Identifier: GPL-2.0
+
+import os
+import unittest
+
+from parameterized import parameterized
+
+from tests.integration.test_utils import RunSubprocessMixin
+from tests.integration.test_utils import podman_compose_path
+from tests.integration.test_utils import test_path
+
+
+def compose_yaml_path():
+    return os.path.join(os.path.join(test_path(), "nets_test3"), "docker-compose.yml")
+
+
+class TestComposeNetsTest3(unittest.TestCase, RunSubprocessMixin):
+    # test if services can access the networks of other services using their respective aliases
+    @parameterized.expand([
+        ("nets_test3_web2_1", "web3", b"test3", 0),
+        ("nets_test3_web2_1", "alias11", b"test3", 0),
+        ("nets_test3_web2_1", "alias12", b"test3", 0),
+        ("nets_test3_web2_1", "alias21", b"test3", 0),
+        ("nets_test3_web1_1", "web3", b"test3", 0),
+        ("nets_test3_web1_1", "alias11", b"test3", 0),
+        ("nets_test3_web1_1", "alias12", b"test3", 0),
+        # connection fails as web1 service does not know net2 and its aliases
+        ("nets_test3_web1_1", "alias21", b"", 1),
+    ])
+    def test_nets_test3(
+        self, container_name, nework_alias_name, expected_text, expected_returncode
+    ):
+        try:
+            self.run_subprocess_assert_returncode(
+                [
+                    podman_compose_path(),
+                    "-f",
+                    compose_yaml_path(),
+                    "up",
+                    "-d",
+                ],
+            )
+            # check connection from different services to network aliases of web3 service
+            cmd = [
+                "podman",
+                "exec",
+                "-it",
+                f"{container_name}",
+                "/bin/busybox",
+                "wget",
+                "-O",
+                "-",
+                "-o",
+                "/dev/null",
+                f"http://{nework_alias_name}:8001/index.txt",
+            ]
+            out, _, returncode = self.run_subprocess(cmd)
+            self.assertEqual(expected_returncode, returncode)
+            self.assertEqual(expected_text, out.strip())
+        finally:
+            self.run_subprocess_assert_returncode([
+                podman_compose_path(),
+                "-f",
+                compose_yaml_path(),
+                "down",
+                "-t",
+                "0",
+            ])