Add integration test for default network behavior

Signed-off-by: Songmin Li <lisongmin@protonmail.com>

tests/integration/default_net_behavior/docker-compose_no_nets.yaml

@@ -0,0 +1,4 @@
+services:
+  web:
+    image: busybox
+    command: httpd -f -p 8123 -h /tmp/

tests/integration/default_net_behavior/docker-compose_no_nets_compat.yaml

@@ -0,0 +1,7 @@
+services:
+  web:
+    image: busybox
+    command: httpd -f -p 8123 -h /tmp/
+
+x-podman:
+  default_net_behavior_compat: true

tests/integration/default_net_behavior/docker-compose_one_net.yaml

@@ -0,0 +1,7 @@
+services:
+  web:
+    image: busybox
+    command: httpd -f -p 8123 -h /tmp/
+
+networks:
+  net0: {}

tests/integration/default_net_behavior/docker-compose_one_net_compat.yaml

@@ -0,0 +1,10 @@
+services:
+  web:
+    image: busybox
+    command: httpd -f -p 8123 -h /tmp/
+
+networks:
+  net0: {}
+
+x-podman:
+  default_net_behavior_compat: true

tests/integration/default_net_behavior/docker-compose_two_nets.yaml

@@ -0,0 +1,8 @@
+services:
+  web:
+    image: busybox
+    command: httpd -f -p 8123 -h /tmp/
+
+networks:
+  net0: {}
+  net1: {}

tests/integration/default_net_behavior/docker-compose_two_nets_compat.yaml

@@ -0,0 +1,11 @@
+services:
+  web:
+    image: busybox
+    command: httpd -f -p 8123 -h /tmp/
+
+networks:
+  net0: {}
+  net1: {}
+
+x-podman:
+  default_net_behavior_compat: true

tests/integration/default_net_behavior/docker-compose_with_default.yaml

@@ -0,0 +1,9 @@
+services:
+  web:
+    image: busybox
+    command: httpd -f -p 8123 -h /tmp/
+
+networks:
+  net0: {}
+  net1: {}
+  default: {}

tests/integration/default_net_behavior/docker-compose_with_default_compat.yaml

@@ -0,0 +1,12 @@
+services:
+  web:
+    image: busybox
+    command: httpd -f -p 8123 -h /tmp/
+
+networks:
+  net0: {}
+  net1: {}
+  default: {}
+
+x-podman:
+  default_net_behavior_compat: true

tests/integration/test_podman_compose_default_net_behavior.py

@@ -0,0 +1,65 @@
+# SPDX-License-Identifier: GPL-2.0
+
+import os
+import unittest
+
+from parameterized import parameterized
+
+from tests.integration.test_podman_compose import podman_compose_path
+from tests.integration.test_podman_compose import test_path
+from tests.integration.test_utils import RunSubprocessMixin
+
+
+def compose_yaml_path(scenario):
+    return os.path.join(
+        os.path.join(test_path(), "default_net_behavior"), f"docker-compose_{scenario}.yaml"
+    )
+
+
+class TestComposeDefaultNetBehavior(unittest.TestCase, RunSubprocessMixin):
+    @parameterized.expand([
+        ('no_nets', 'default_net_behavior_default'),
+        ('one_net', 'default_net_behavior_net0'),
+        ('two_nets', 'podman'),
+        ('with_default', 'default_net_behavior_default'),
+        ('no_nets_compat', 'default_net_behavior_default'),
+        ('one_net_compat', 'default_net_behavior_default'),
+        ('two_nets_compat', 'default_net_behavior_default'),
+        ('with_default_compat', 'default_net_behavior_default'),
+    ])
+    def test_nethost(self, scenario, default_net):
+        try:
+            self.run_subprocess_assert_returncode(
+                [podman_compose_path(), "-f", compose_yaml_path(scenario), "up", "-d"],
+            )
+
+            container_id, _ = self.run_subprocess_assert_returncode(
+                [
+                    podman_compose_path(),
+                    "-f",
+                    compose_yaml_path(scenario),
+                    "ps",
+                    "--format",
+                    '{{.ID}}',
+                ],
+            )
+            container_id = container_id.decode('utf-8').split('\n')[0]
+            output, _ = self.run_subprocess_assert_returncode(
+                [
+                    "podman",
+                    "inspect",
+                    container_id,
+                    "--format",
+                    "{{range $key, $value := .NetworkSettings.Networks }}{{ $key }}\n{{ end }}",
+                ],
+            )
+            self.assertEqual(output.decode('utf-8').strip(), default_net)
+        finally:
+            self.run_subprocess_assert_returncode([
+                podman_compose_path(),
+                "-f",
+                compose_yaml_path(scenario),
+                "down",
+                "-t",
+                "0",
+            ])