Add podman unit tests (#312)

Podman unit tests for docker runner.

Author: dfeddema

runners/mlcube_docker/mlcube_docker/tests/test_docker_runner.py

@@ -10,6 +10,8 @@
 from mlcube.shell import Shell
 
 _HAVE_DOCKER: bool = Shell.run(["docker", "--version"], on_error="ignore") == 0
+_HAVE_PODMAN: bool = Shell.run(["podman", "--version"], on_error="ignore") == 0
+
 
 _MLCUBE_DEFAULT_ENTRY_POINT = """
 docker:
@@ -54,13 +56,13 @@ def setUp(self) -> None:
     def tearDown(self) -> None:
         Shell.sync_workspace = self.sync_workspace
 
-    @unittest.skipUnless(_HAVE_DOCKER, reason="No docker available.")
-    def test_mlcube_default_entrypoints(self):
+    def default_entry_points(self, executable: str) -> None:
         with patch("io.open", mock_open(read_data=_MLCUBE_DEFAULT_ENTRY_POINT)):
             mlcube: DictConfig = MLCubeConfig.create_mlcube_config(
                 "/some/path/to/mlcube.yaml",
                 runner_config=Config.DEFAULT,
                 runner_cls=DockerRun,
+                mlcube_cli_args=OmegaConf.create({"docker": {"docker": executable}}),
             )
         self.assertEqual(mlcube.runner.image, "ubuntu:18.04")
         self.assertDictEqual(
@@ -76,13 +78,13 @@ def test_mlcube_default_entrypoints(self):
         DockerRun(mlcube, task="ls").run()
         DockerRun(mlcube, task="pwd").run()
 
-    @unittest.skipUnless(_HAVE_DOCKER, reason="No docker available.")
-    def test_mlcube_custom_entrypoints(self):
+    def custom_entry_points(self, executable: str) -> None:
         with patch("io.open", mock_open(read_data=_MLCUBE_CUSTOM_ENTRY_POINTS)):
             mlcube: DictConfig = MLCubeConfig.create_mlcube_config(
                 "/some/path/to/mlcube.yaml",
                 runner_config=Config.DEFAULT,
                 runner_cls=DockerRun,
+                mlcube_cli_args=OmegaConf.create({"docker": {"docker": executable}}),
             )
         self.assertEqual(mlcube.runner.image, "ubuntu:18.04")
         self.assertDictEqual(
@@ -100,3 +102,19 @@ def test_mlcube_custom_entrypoints(self):
         self._check_inspect_output(DockerRun(mlcube, task=None).inspect())
         DockerRun(mlcube, task="ls").run()
         DockerRun(mlcube, task="free").run()
+
+    @unittest.skipUnless(_HAVE_PODMAN, reason="No podman available.")
+    def test_default_entrypoints_with_podman(self):
+        self.default_entry_points("podman")
+
+    @unittest.skipUnless(_HAVE_DOCKER, reason="No docker available.")
+    def test_default_entrypoints_with_docker(self):
+        self.default_entry_points("docker")
+
+    @unittest.skipUnless(_HAVE_PODMAN, reason="No podman available.")
+    def test_custom_entrypoints_with_podman(self):
+        self.custom_entry_points("podman")
+
+    @unittest.skipUnless(_HAVE_DOCKER, reason="No docker available.")
+    def test_custom_entrypoints_with_docker(self):
+        self.custom_entry_points("docker")