docker_compose_v2: move some code to module_utils (#747)

* Move some code to module_utils.

* Add unit tests.

Test cases are auto-generated from integration test logs.

* Rename ResourceEvent → Event.

tests/unit/plugins/module_utils/test_compose_v2.py

@@ -0,0 +1,31 @@
+# Copyright 2022 Red Hat | Ansible
+# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+import pytest
+
+from ansible_collections.community.docker.plugins.module_utils.compose_v2 import (
+    parse_events,
+)
+
+from .compose_v2_test_cases import EVENT_TEST_CASES
+
+
+@pytest.mark.parametrize(
+    'test_id, compose_version, dry_run, stderr, events, warnings',
+    EVENT_TEST_CASES,
+    ids=[tc[0] for tc in EVENT_TEST_CASES],
+)
+def test_parse_events(test_id, compose_version, dry_run, stderr, events, warnings):
+    collected_warnings = []
+
+    def collect_warning(msg):
+        collected_warnings.append(msg)
+
+    collected_events = parse_events(stderr, dry_run=dry_run, warn_function=collect_warning)
+
+    assert events == collected_events
+    assert warnings == collected_warnings