Add unit tests to container_runtime salt module

susemanager-utils/susemanager-sls/src/tests/test_module_container_runtime.py

@@ -0,0 +1,39 @@
+"""
+Unit tests for the container_runtime module
+"""
+from ..modules import container_runtime
+
+from unittest.mock import patch, mock_open, MagicMock
+import pytest
+
+@pytest.mark.parametrize(
+    "mock_read_file_return, mock_exists_return, expected_result",
+    [
+        ("docker", {"/proc/self/cgroup": True, "/.dockerenv": True}, "docker"),
+        ("", {"/proc/vz": True, "/proc/bc": False}, "openvz"),
+        ("podman", {"/run/.containerenv": True}, "podman"),
+        ("", {"/__runsc_containers__": True}, "gvisor"),
+        ("", {}, None),
+    ],
+)
+def test_get_container_runtime(mock_read_file_return, mock_exists_return, expected_result):
+    mock_read_file = MagicMock(return_value=mock_read_file_return)
+    mock_exists = MagicMock(side_effect=lambda path: mock_exists_return.get(path, False))
+    container_runtime._read_file = mock_read_file
+    with patch("os.path.exists", mock_exists):
+        assert container_runtime.get_container_runtime() == expected_result
+
+@pytest.mark.parametrize("file_name, expected_result", [
+    ("/run/.containerenv", "podman"),
+    ("/.dockerenv", "docker"),
+    ("/var/run/secrets/kubernetes.io/serviceaccount", "kube"),
+])
+def test_detect_container_files(file_name, expected_result):
+    mock_exists = MagicMock(side_effect=lambda path: path == file_name)
+    with patch("os.path.exists", mock_exists):
+        assert container_runtime._detect_container_files() == expected_result
+
+def test_detect_container_files_not_found():
+    mock_exists = MagicMock(side_effect=lambda path: False)
+    with patch("os.path.exists", mock_exists):
+        assert container_runtime._detect_container_files() == "not-found"