Refactor docker-py compatibility tests

* Add which python client is being used to run tests, see "python
  client" below.
* Remove redundate code from test classes
* Update/Add comments to modules and classes

======================================================= test session starts ========================================================
platform linux -- Python 3.10.0, pytest-6.2.4, py-1.10.0, pluggy-0.13.1
python client -- DockerClient
rootdir: /home/jhonce/Projects/go/src/github.com/containers/podman
plugins: requests-mock-1.8.0
collected 33 items

test/python/docker/compat/test_containers.py ...s..............  [ 54%]
test/python/docker/compat/test_images.py ............  [ 90%]
test/python/docker/compat/test_system.py ...  [100%]

Note: Follow-up PRs will verify the test results and expand the tests.

Signed-off-by: Jhon Honce <jhonce@redhat.com>

7 files changed, 259 insertions, 298 deletions

diff --git a/test/python/docker/__init__.py b/test/python/docker/__init__.py
index 816667b82..d46f465f7 100644
--- a/test/python/docker/__init__.py
+++ b/test/python/docker/__init__.py
@@ -1,4 +1,6 @@
-import configparser
+"""
+Helpers for integration tests using DockerClient
+"""
 import json
 import os
 import pathlib
@@ -11,7 +13,7 @@ from docker import DockerClient
 from .compat import constant
 
 
-class Podman(object):
+class PodmanAPI:
     """
     Instances hold the configuration and setup for running podman commands
     """
@@ -53,17 +55,13 @@ location = "mirror.localhost:5000"
 
 """
 
-        with open(os.environ["CONTAINERS_REGISTRIES_CONF"], "w") as w:
-            w.write(conf)
+        with open(os.environ["CONTAINERS_REGISTRIES_CONF"], "w") as file:
+            file.write(conf)
 
-        os.environ["CNI_CONFIG_PATH"] = os.path.join(
-            self.anchor_directory, "cni", "net.d"
-        )
+        os.environ["CNI_CONFIG_PATH"] = os.path.join(self.anchor_directory, "cni", "net.d")
         os.makedirs(os.environ["CNI_CONFIG_PATH"], exist_ok=True)
         self.cmd.append("--network-config-dir=" + os.environ["CNI_CONFIG_PATH"])
-        cni_cfg = os.path.join(
-            os.environ["CNI_CONFIG_PATH"], "87-podman-bridge.conflist"
-        )
+        cni_cfg = os.path.join(os.environ["CNI_CONFIG_PATH"], "87-podman-bridge.conflist")
         # json decoded and encoded to ensure legal json
         buf = json.loads(
             """
@@ -93,8 +91,8 @@ location = "mirror.localhost:5000"
             }
             """
         )
-        with open(cni_cfg, "w") as w:
-            json.dump(buf, w)
+        with open(cni_cfg, "w") as file:
+            json.dump(buf, file)
 
     def open(self, command, *args, **kwargs):
         """Podman initialized instance to run a given command
@@ -111,6 +109,7 @@ location = "mirror.localhost:5000"
 
         shell = kwargs.get("shell", False)
 
+        # pylint: disable=consider-using-with
         return subprocess.Popen(
             cmd,
             shell=shell,
@@ -144,9 +143,11 @@ location = "mirror.localhost:5000"
         )
 
     def tear_down(self):
+        """Delete test environment."""
         shutil.rmtree(self.anchor_directory, ignore_errors=True)
 
     def restore_image_from_cache(self, client: DockerClient):
+        """Populate images from cache."""
         path = os.path.join(self.image_cache, constant.ALPINE_TARBALL)
         if not os.path.exists(path):
             img = client.images.pull(constant.ALPINE)
@@ -157,5 +158,6 @@ location = "mirror.localhost:5000"
             self.run("load", "-i", path, check=True)
 
     def flush_image_cache(self):
-        for f in pathlib.Path(self.image_cache).glob("*.tar"):
-            f.unlink(f)
+        """Delete image cache."""
+        for file in pathlib.Path(self.image_cache).glob("*.tar"):
+            file.unlink(missing_ok=True)
diff --git a/test/python/docker/compat/common.py b/test/python/docker/compat/common.py
index bdc67c287..218ac9872 100644
--- a/test/python/docker/compat/common.py
+++ b/test/python/docker/compat/common.py
@@ -1,23 +1,92 @@
+"""
+Fixtures and Helpers for unittests.
+"""
+import subprocess
+import sys
+import time
+import unittest
+
+# pylint: disable=no-name-in-module,import-error,wrong-import-order
 from docker import DockerClient
 
+from test.python.docker import PodmanAPI
 from test.python.docker.compat import constant
 
 
 def run_top_container(client: DockerClient):
-    c = client.containers.create(
-        constant.ALPINE, command="top", detach=True, tty=True, name="top"
+    """Run top command in a alpine container."""
+    ctnr = client.containers.create(
+        constant.ALPINE,
+        command="top",
+        detach=True,
+        tty=True,
+        name="top",
     )
-    c.start()
-    return c.id
+    ctnr.start()
+    return ctnr.id
 
 
 def remove_all_containers(client: DockerClient):
+    """Delete all containers from the Podman service."""
     for ctnr in client.containers.list(all=True):
         ctnr.remove(force=True)
 
 
 def remove_all_images(client: DockerClient):
+    """Delete all images from the Podman service."""
     for img in client.images.list():
         # FIXME should DELETE /images accept the sha256: prefix?
         id_ = img.id.removeprefix("sha256:")
         client.images.remove(id_, force=True)
+
+
+class DockerTestCase(unittest.TestCase):
+    """Specialized TestCase class for testing against Podman service."""
+
+    podman: PodmanAPI = None  # initialized podman configuration for tests
+    service: subprocess.Popen = None  # podman service instance
+
+    top_container_id: str = None
+    docker: DockerClient = None
+
+    @classmethod
+    def setUpClass(cls) -> None:
+        super().setUpClass()
+
+        cls.podman = PodmanAPI()
+        super().addClassCleanup(cls.podman.tear_down)
+
+        cls.service = cls.podman.open("system", "service", "tcp:127.0.0.1:8080", "--time=0")
+        # give the service some time to be ready...
+        time.sleep(2)
+
+        return_code = cls.service.poll()
+        if return_code is not None:
+            raise subprocess.CalledProcessError(return_code, "podman system service")
+
+    @classmethod
+    def tearDownClass(cls) -> None:
+        cls.service.terminate()
+        stdout, stderr = cls.service.communicate(timeout=0.5)
+        if stdout:
+            sys.stdout.write("\ndocker-py -- Service Stdout:\n" + stdout.decode("utf-8"))
+        if stderr:
+            sys.stderr.write("\ndocker-py -- Service Stderr:\n" + stderr.decode("utf-8"))
+
+        return super().tearDownClass()
+
+    def setUp(self) -> None:
+        super().setUp()
+
+        self.docker = DockerClient(base_url="tcp://127.0.0.1:8080", timeout=15)
+        self.addCleanup(self.docker.close)
+
+        self.podman.restore_image_from_cache(self.docker)
+        self.top_container_id = run_top_container(self.docker)
+        self.assertIsNotNone(self.top_container_id, "Failed to create 'top' container")
+
+    def tearDown(self) -> None:
+        remove_all_containers(self.docker)
+        remove_all_images(self.docker)
+
+        super().tearDown()
diff --git a/test/python/docker/compat/constant.py b/test/python/docker/compat/constant.py
index 892293c97..2a0046daf 100644
--- a/test/python/docker/compat/constant.py
+++ b/test/python/docker/compat/constant.py
@@ -1,6 +1,8 @@
+"""
+Constants to use in writing unittests.
+"""
 ALPINE = "quay.io/libpod/alpine:latest"
 ALPINE_SHORTNAME = "alpine"
 ALPINE_TARBALL = "alpine.tar"
 BB = "quay.io/libpod/busybox:latest"
 NGINX = "quay.io/libpod/alpine_nginx:latest"
-infra = "k8s.gcr.io/pause:3.2"
diff --git a/test/python/docker/compat/test_containers.py b/test/python/docker/compat/test_containers.py
index d14c09fc1..c0b6c9abe 100644
--- a/test/python/docker/compat/test_containers.py
+++ b/test/python/docker/compat/test_containers.py
@@ -1,111 +1,56 @@
+"""
+Integration tests for exercising docker-py against Podman Service.
+"""
 import io
-import subprocess
-import sys
-import time
-import unittest
-from typing import IO, Optional, List
+import tarfile
+from typing import IO, List, Optional
 
-from docker import DockerClient, errors
+from docker import errors
 from docker.models.containers import Container
 from docker.models.images import Image
 from docker.models.volumes import Volume
 from docker.types import Mount
 
-from test.python.docker import Podman
+# pylint: disable=no-name-in-module,import-error,wrong-import-order
 from test.python.docker.compat import common, constant
 
-import tarfile
-
-
-class TestContainers(unittest.TestCase):
-    podman = None  # initialized podman configuration for tests
-    service = None  # podman service instance
-    topContainerId = ""
-
-    def setUp(self):
-        super().setUp()
-        self.client = DockerClient(base_url="tcp://127.0.0.1:8080", timeout=15)
-        TestContainers.podman.restore_image_from_cache(self.client)
-        TestContainers.topContainerId = common.run_top_container(self.client)
-        self.assertIsNotNone(TestContainers.topContainerId)
-
-    def tearDown(self):
-        common.remove_all_containers(self.client)
-        common.remove_all_images(self.client)
-        self.client.close()
-        return super().tearDown()
-
-    @classmethod
-    def setUpClass(cls):
-        super().setUpClass()
-        TestContainers.podman = Podman()
-        TestContainers.service = TestContainers.podman.open(
-            "system", "service", "tcp:127.0.0.1:8080", "--time=0"
-        )
-        # give the service some time to be ready...
-        time.sleep(2)
-
-        rc = TestContainers.service.poll()
-        if rc is not None:
-            raise subprocess.CalledProcessError(rc, "podman system service")
 
-    @classmethod
-    def tearDownClass(cls):
-        TestContainers.service.terminate()
-        stdout, stderr = TestContainers.service.communicate(timeout=0.5)
-        if stdout:
-            sys.stdout.write("\nContainers Service Stdout:\n" + stdout.decode("utf-8"))
-        if stderr:
-            sys.stderr.write("\nContainers Service Stderr:\n" + stderr.decode("utf-8"))
-
-        TestContainers.podman.tear_down()
-        return super().tearDownClass()
+# pylint: disable=missing-function-docstring
+class TestContainers(common.DockerTestCase):
+    """TestCase for exercising containers."""
 
     def test_create_container(self):
-        # Run a container with detach mode
-        self.client.containers.create(image="alpine", detach=True)
-        self.assertEqual(len(self.client.containers.list(all=True)), 2)
+        """Run a container with detach mode."""
+        self.docker.containers.create(image="alpine", detach=True)
+        self.assertEqual(len(self.docker.containers.list(all=True)), 2)
 
     def test_create_network(self):
-        net = self.client.networks.create("testNetwork", driver="bridge")
-        ctnr = self.client.containers.create(image="alpine", detach=True)
-
-        #  TODO fix when ready
-        # This test will not work until all connect|disconnect
-        # code is fixed.
-        # net.connect(ctnr)
-
-        # nets = self.client.networks.list(greedy=True)
-        # self.assertGreaterEqual(len(nets), 1)
-
-        # TODO fix endpoint to include containers
-        # for n in nets:
-        #     if n.id == "testNetwork":
-        #         self.assertEqual(ctnr.id, n.containers)
-        # self.assertTrue(False, "testNetwork not found")
+        """Add network to a container."""
+        self.docker.networks.create("testNetwork", driver="bridge")
+        self.docker.containers.create(image="alpine", detach=True)
 
     def test_start_container(self):
         # Podman docs says it should give a 304 but returns with no response
         # # Start a already started container should return 304
-        # response = self.client.api.start(container=TestContainers.topContainerId)
+        # response = self.docker.api.start(container=self.top_container_id)
         # self.assertEqual(error.exception.response.status_code, 304)
 
         # Create a new container and validate the count
-        self.client.containers.create(image=constant.ALPINE, name="container2")
-        containers = self.client.containers.list(all=True)
+        self.docker.containers.create(image=constant.ALPINE, name="container2")
+        containers = self.docker.containers.list(all=True)
         self.assertEqual(len(containers), 2)
 
     def test_start_container_with_random_port_bind(self):
-        container = self.client.containers.create(
+        container = self.docker.containers.create(
             image=constant.ALPINE,
             name="containerWithRandomBind",
             ports={"1234/tcp": None},
         )
-        containers = self.client.containers.list(all=True)
+        containers = self.docker.containers.list(all=True)
         self.assertTrue(container in containers)
 
     def test_stop_container(self):
-        top = self.client.containers.get(TestContainers.topContainerId)
+        top = self.docker.containers.get(self.top_container_id)
         self.assertEqual(top.status, "running")
 
         # Stop a running container and validate the state
@@ -114,7 +59,7 @@ class TestContainers(unittest.TestCase):
         self.assertIn(top.status, ("stopped", "exited"))
 
     def test_kill_container(self):
-        top = self.client.containers.get(TestContainers.topContainerId)
+        top = self.docker.containers.get(self.top_container_id)
         self.assertEqual(top.status, "running")
 
         # Kill a running container and validate the state
@@ -124,7 +69,7 @@ class TestContainers(unittest.TestCase):
 
     def test_restart_container(self):
         # Validate the container state
-        top = self.client.containers.get(TestContainers.topContainerId)
+        top = self.docker.containers.get(self.top_container_id)
         top.stop()
         top.reload()
         self.assertIn(top.status, ("stopped", "exited"))
@@ -136,16 +81,16 @@ class TestContainers(unittest.TestCase):
 
     def test_remove_container(self):
         # Remove container by ID with force
-        top = self.client.containers.get(TestContainers.topContainerId)
+        top = self.docker.containers.get(self.top_container_id)
         top.remove(force=True)
-        self.assertEqual(len(self.client.containers.list()), 0)
+        self.assertEqual(len(self.docker.containers.list()), 0)
 
     def test_remove_container_without_force(self):
         # Validate current container count
-        self.assertEqual(len(self.client.containers.list()), 1)
+        self.assertEqual(len(self.docker.containers.list()), 1)
 
         # Remove running container should throw error
-        top = self.client.containers.get(TestContainers.topContainerId)
+        top = self.docker.containers.get(self.top_container_id)
         with self.assertRaises(errors.APIError) as error:
             top.remove()
         self.assertEqual(error.exception.response.status_code, 500)
@@ -153,11 +98,11 @@ class TestContainers(unittest.TestCase):
         # Remove container by ID without force
         top.stop()
         top.remove()
-        self.assertEqual(len(self.client.containers.list()), 0)
+        self.assertEqual(len(self.docker.containers.list()), 0)
 
     def test_pause_container(self):
         # Validate the container state
-        top = self.client.containers.get(TestContainers.topContainerId)
+        top = self.docker.containers.get(self.top_container_id)
         self.assertEqual(top.status, "running")
 
         # Pause a running container and validate the state
@@ -167,7 +112,7 @@ class TestContainers(unittest.TestCase):
 
     def test_pause_stopped_container(self):
         # Stop the container
-        top = self.client.containers.get(TestContainers.topContainerId)
+        top = self.docker.containers.get(self.top_container_id)
         top.stop()
 
         # Pause exited container should throw error
@@ -176,7 +121,7 @@ class TestContainers(unittest.TestCase):
         self.assertEqual(error.exception.response.status_code, 500)
 
     def test_unpause_container(self):
-        top = self.client.containers.get(TestContainers.topContainerId)
+        top = self.docker.containers.get(self.top_container_id)
 
         # Validate the container state
         top.pause()
@@ -190,21 +135,21 @@ class TestContainers(unittest.TestCase):
 
     def test_list_container(self):
         # Add container and validate the count
-        self.client.containers.create(image="alpine", detach=True)
-        containers = self.client.containers.list(all=True)
+        self.docker.containers.create(image="alpine", detach=True)
+        containers = self.docker.containers.list(all=True)
         self.assertEqual(len(containers), 2)
 
     def test_filters(self):
         self.skipTest("TODO Endpoint does not yet support filters")
 
         # List container with filter by id
-        filters = {"id": TestContainers.topContainerId}
-        ctnrs = self.client.containers.list(all=True, filters=filters)
+        filters = {"id": self.top_container_id}
+        ctnrs = self.docker.containers.list(all=True, filters=filters)
         self.assertEqual(len(ctnrs), 1)
 
         # List container with filter by name
         filters = {"name": "top"}
-        ctnrs = self.client.containers.list(all=True, filters=filters)
+        ctnrs = self.docker.containers.list(all=True, filters=filters)
         self.assertEqual(len(ctnrs), 1)
 
     def test_copy_to_container(self):
@@ -212,31 +157,33 @@ class TestContainers(unittest.TestCase):
         vol: Optional[Volume] = None
         try:
             test_file_content = b"Hello World!"
-            vol = self.client.volumes.create("test-volume")
-            ctr = self.client.containers.create(image="alpine",
-                                                detach=True,
-                                                command="top",
-                                                volumes=["test-volume:/test-volume-read-only:ro"])
+            vol = self.docker.volumes.create("test-volume")
+            ctr = self.docker.containers.create(
+                image="alpine",
+                detach=True,
+                command="top",
+                volumes=["test-volume:/test-volume-read-only:ro"],
+            )
             ctr.start()
 
             buff: IO[bytes] = io.BytesIO()
-            with tarfile.open(fileobj=buff, mode="w:") as tf:
-                ti: tarfile.TarInfo = tarfile.TarInfo()
-                ti.uid = 1042
-                ti.gid = 1043
-                ti.name = "a.txt"
-                ti.path = "a.txt"
-                ti.mode = 0o644
-                ti.type = tarfile.REGTYPE
-                ti.size = len(test_file_content)
-                tf.addfile(ti, fileobj=io.BytesIO(test_file_content))
+            with tarfile.open(fileobj=buff, mode="w:") as file:
+                info: tarfile.TarInfo = tarfile.TarInfo()
+                info.uid = 1042
+                info.gid = 1043
+                info.name = "a.txt"
+                info.path = "a.txt"
+                info.mode = 0o644
+                info.type = tarfile.REGTYPE
+                info.size = len(test_file_content)
+                file.addfile(info, fileobj=io.BytesIO(test_file_content))
 
             buff.seek(0)
             ctr.put_archive("/tmp/", buff)
             ret, out = ctr.exec_run(["stat", "-c", "%u:%g", "/tmp/a.txt"])
 
             self.assertEqual(ret, 0)
-            self.assertEqual(out.rstrip(), b'1042:1043', "UID/GID of copied file")
+            self.assertEqual(out.rstrip(), b"1042:1043", "UID/GID of copied file")
 
             ret, out = ctr.exec_run(["cat", "/tmp/a.txt"])
             self.assertEqual(ret, 0)
@@ -253,48 +200,61 @@ class TestContainers(unittest.TestCase):
                 vol.remove(force=True)
 
     def test_mount_preexisting_dir(self):
-        dockerfile = (B'FROM quay.io/libpod/alpine:latest\n'
-                      B'USER root\n'
-                      B'RUN mkdir -p /workspace\n'
-                      B'RUN chown 1042:1043 /workspace')
+        dockerfile = (
+            b"FROM quay.io/libpod/alpine:latest\n"
+            b"USER root\n"
+            b"RUN mkdir -p /workspace\n"
+            b"RUN chown 1042:1043 /workspace"
+        )
         img: Image
-        img, out = self.client.images.build(fileobj=io.BytesIO(dockerfile))
-        ctr: Container = self.client.containers.create(image=img.id, detach=True, command="top",
-                                                       volumes=["test_mount_preexisting_dir_vol:/workspace"])
+        img, out = self.docker.images.build(fileobj=io.BytesIO(dockerfile))
+        ctr: Container = self.docker.containers.create(
+            image=img.id,
+            detach=True,
+            command="top",
+            volumes=["test_mount_preexisting_dir_vol:/workspace"],
+        )
         ctr.start()
-        ret, out = ctr.exec_run(["stat", "-c", "%u:%g", "/workspace"])
-        self.assertEqual(out.rstrip(), b'1042:1043', "UID/GID set in dockerfile")
-
+        _, out = ctr.exec_run(["stat", "-c", "%u:%g", "/workspace"])
+        self.assertEqual(out.rstrip(), b"1042:1043", "UID/GID set in dockerfile")
 
     def test_non_existant_workdir(self):
-        dockerfile = (B'FROM quay.io/libpod/alpine:latest\n'
-                      B'USER root\n'
-                      B'WORKDIR /workspace/scratch\n'
-                      B'RUN touch test')
+        dockerfile = (
+            b"FROM quay.io/libpod/alpine:latest\n"
+            b"USER root\n"
+            b"WORKDIR /workspace/scratch\n"
+            b"RUN touch test"
+        )
         img: Image
-        img, out = self.client.images.build(fileobj=io.BytesIO(dockerfile))
-        ctr: Container = self.client.containers.create(image=img.id, detach=True, command="top",
-                                                       volumes=["test_non_existant_workdir:/workspace"])
+        img, _ = self.docker.images.build(fileobj=io.BytesIO(dockerfile))
+        ctr: Container = self.docker.containers.create(
+            image=img.id,
+            detach=True,
+            command="top",
+            volumes=["test_non_existant_workdir:/workspace"],
+        )
         ctr.start()
-        ret, out = ctr.exec_run(["stat", "/workspace/scratch/test"])
+        ret, _ = ctr.exec_run(["stat", "/workspace/scratch/test"])
         self.assertEqual(ret, 0, "Working directory created if it doesn't exist")
 
     def test_mount_rw_by_default(self):
         ctr: Optional[Container] = None
         vol: Optional[Volume] = None
+
         try:
-            vol = self.client.volumes.create("test-volume")
-            ctr = self.client.containers.create(image="alpine",
-                                                detach=True,
-                                                command="top",
-                                                mounts=[Mount(target="/vol-mnt",
-                                                              source="test-volume",
-                                                              type='volume',
-                                                              read_only=False)])
-            ctr_inspect = self.client.api.inspect_container(ctr.id)
+            vol = self.docker.volumes.create("test-volume")
+            ctr = self.docker.containers.create(
+                image="alpine",
+                detach=True,
+                command="top",
+                mounts=[
+                    Mount(target="/vol-mnt", source="test-volume", type="volume", read_only=False)
+                ],
+            )
+            ctr_inspect = self.docker.api.inspect_container(ctr.id)
             binds: List[str] = ctr_inspect["HostConfig"]["Binds"]
             self.assertEqual(len(binds), 1)
-            self.assertEqual(binds[0], 'test-volume:/vol-mnt:rw,rprivate,nosuid,nodev,rbind')
+            self.assertEqual(binds[0], "test-volume:/vol-mnt:rw,rprivate,nosuid,nodev,rbind")
         finally:
             if ctr is not None:
                 ctr.remove()
diff --git a/test/python/docker/compat/test_images.py b/test/python/docker/compat/test_images.py
index 05d0e3e12..ac9a8d671 100644
--- a/test/python/docker/compat/test_images.py
+++ b/test/python/docker/compat/test_images.py
@@ -1,116 +1,73 @@
-import collections
+"""
+Integration tests for exercising docker-py against Podman Service.
+"""
 import io
 import os
-import subprocess
-import sys
-import time
 import unittest
 
-from docker import DockerClient, errors
-from docker.errors import APIError
+from docker import errors
 
-from test.python.docker import Podman
+# pylint: disable=no-name-in-module,import-error,wrong-import-order
 from test.python.docker.compat import common, constant
 
 
-class TestImages(unittest.TestCase):
-    podman = None  # initialized podman configuration for tests
-    service = None  # podman service instance
-
-    def setUp(self):
-        super().setUp()
-        self.client = DockerClient(base_url="tcp://127.0.0.1:8080", timeout=15)
-
-        TestImages.podman.restore_image_from_cache(self.client)
-
-    def tearDown(self):
-        common.remove_all_images(self.client)
-        self.client.close()
-        return super().tearDown()
-
-    @classmethod
-    def setUpClass(cls):
-        super().setUpClass()
-        TestImages.podman = Podman()
-        TestImages.service = TestImages.podman.open(
-            "system", "service", "tcp:127.0.0.1:8080", "--time=0"
-        )
-        # give the service some time to be ready...
-        time.sleep(2)
-
-        returncode = TestImages.service.poll()
-        if returncode is not None:
-            raise subprocess.CalledProcessError(returncode, "podman system service")
-
-    @classmethod
-    def tearDownClass(cls):
-        TestImages.service.terminate()
-        stdout, stderr = TestImages.service.communicate(timeout=0.5)
-        if stdout:
-            sys.stdout.write("\nImages Service Stdout:\n" + stdout.decode("utf-8"))
-        if stderr:
-            sys.stderr.write("\nImAges Service Stderr:\n" + stderr.decode("utf-8"))
-
-        TestImages.podman.tear_down()
-        return super().tearDownClass()
+class TestImages(common.DockerTestCase):
+    """TestCase for exercising images."""
 
     def test_tag_valid_image(self):
         """Validates if the image is tagged successfully"""
-        alpine = self.client.images.get(constant.ALPINE)
+        alpine = self.docker.images.get(constant.ALPINE)
         self.assertTrue(alpine.tag("demo", constant.ALPINE_SHORTNAME))
 
-        alpine = self.client.images.get(constant.ALPINE)
-        for t in alpine.tags:
-            self.assertIn("alpine", t)
+        alpine = self.docker.images.get(constant.ALPINE)
+        for tag in alpine.tags:
+            self.assertIn("alpine", tag)
 
-    # @unittest.skip("doesn't work now")
     def test_retag_valid_image(self):
-        """Validates if name updates when the image is retagged"""
-        alpine = self.client.images.get(constant.ALPINE)
+        """Validates if name updates when the image is re-tagged."""
+        alpine = self.docker.images.get(constant.ALPINE)
         self.assertTrue(alpine.tag("demo", "rename"))
 
-        alpine = self.client.images.get(constant.ALPINE)
+        alpine = self.docker.images.get(constant.ALPINE)
         self.assertNotIn("demo:test", alpine.tags)
 
     def test_list_images(self):
         """List images"""
-        self.assertEqual(len(self.client.images.list()), 1)
+        self.assertEqual(len(self.docker.images.list()), 1)
 
         # Add more images
-        self.client.images.pull(constant.BB)
-        self.assertEqual(len(self.client.images.list()), 2)
-        self.assertEqual(len(self.client.images.list(all=True)), 2)
+        self.docker.images.pull(constant.BB)
+        self.assertEqual(len(self.docker.images.list()), 2)
+        self.assertEqual(len(self.docker.images.list(all=True)), 2)
 
         # List images with filter
-        self.assertEqual(len(self.client.images.list(filters={"reference": "alpine"})), 1)
+        self.assertEqual(len(self.docker.images.list(filters={"reference": "alpine"})), 1)
 
     def test_search_image(self):
         """Search for image"""
-        for r in self.client.images.search("alpine"):
+        for registry in self.docker.images.search("alpine"):
             # registry matches if string is in either one
-            self.assertIn("alpine", r["Name"]+" "+r["Description"].lower())
+            self.assertIn("alpine", registry["Name"] + " " + registry["Description"].lower())
 
     def test_search_bogus_image(self):
         """Search for bogus image should throw exception"""
-        try:
-            r = self.client.images.search("bogus/bogus")
-        except:
-            return
-        self.assertTrue(len(r) == 0)
+        with self.assertRaises(errors.APIError):
+            self.docker.images.search("bogus/bogus")
 
     def test_remove_image(self):
         """Remove image"""
         # Check for error with wrong image name
         with self.assertRaises(errors.NotFound):
-            self.client.images.remove("dummy")
-        self.assertEqual(len(self.client.images.list()), 1)
+            self.docker.images.remove("dummy")
 
-        self.client.images.remove(constant.ALPINE)
-        self.assertEqual(len(self.client.images.list()), 0)
+        common.remove_all_containers(self.docker)
+        self.assertEqual(len(self.docker.images.list()), 1)
+        self.docker.images.remove(constant.ALPINE)
+        self.assertEqual(len(self.docker.images.list()), 0)
 
     def test_image_history(self):
         """Image history"""
-        img = self.client.images.get(constant.ALPINE)
+        img = self.docker.images.get(constant.ALPINE)
         history = img.history()
         image_id = img.id[7:] if img.id.startswith("sha256:") else img.id
 
@@ -122,47 +79,49 @@ class TestImages(unittest.TestCase):
     def test_get_image_exists_not(self):
         """Negative test for get image"""
         with self.assertRaises(errors.NotFound):
-            response = self.client.images.get("image_does_not_exists")
-            collections.deque(response)
+            self.docker.images.get("image_does_not_exists")
 
     def test_save_image(self):
         """Export Image"""
-        image = self.client.images.pull(constant.BB)
+        image = self.docker.images.pull(constant.BB)
 
         file = os.path.join(TestImages.podman.image_cache, "busybox.tar")
         with open(file, mode="wb") as tarball:
             for frame in image.save(named=True):
                 tarball.write(frame)
-        sz = os.path.getsize(file)
-        self.assertGreater(sz, 0)
+        self.assertGreater(os.path.getsize(file), 0)
 
     def test_load_image(self):
         """Import|Load Image"""
-        self.assertEqual(len(self.client.images.list()), 1)
+        self.assertEqual(len(self.docker.images.list()), 1)
 
-        image = self.client.images.pull(constant.BB)
+        image = self.docker.images.pull(constant.BB)
         file = os.path.join(TestImages.podman.image_cache, "busybox.tar")
         with open(file, mode="wb") as tarball:
             for frame in image.save():
                 tarball.write(frame)
 
         with open(file, mode="rb") as saved:
-            _ = self.client.images.load(saved)
+            self.docker.images.load(saved)
 
-        self.assertEqual(len(self.client.images.list()), 2)
+        self.assertEqual(len(self.docker.images.list()), 2)
 
     def test_load_corrupt_image(self):
         """Import|Load Image failure"""
         tarball = io.BytesIO("This is a corrupt tarball".encode("utf-8"))
-        with self.assertRaises(APIError):
-            self.client.images.load(tarball)
+        with self.assertRaises(errors.APIError):
+            self.docker.images.load(tarball)
 
     def test_build_image(self):
+        """Build Image with custom labels."""
         labels = {"apple": "red", "grape": "green"}
-        _ = self.client.images.build(
-            path="test/python/docker/build_labels", labels=labels, tag="labels", isolation="default"
+        self.docker.images.build(
+            path="test/python/docker/build_labels",
+            labels=labels,
+            tag="labels",
+            isolation="default",
         )
-        image = self.client.images.get("labels")
+        image = self.docker.images.get("labels")
         self.assertEqual(image.labels["apple"], labels["apple"])
         self.assertEqual(image.labels["grape"], labels["grape"])
 
diff --git a/test/python/docker/compat/test_system.py b/test/python/docker/compat/test_system.py
index a928de0ee..f6092996b 100644
--- a/test/python/docker/compat/test_system.py
+++ b/test/python/docker/compat/test_system.py
@@ -1,71 +1,32 @@
-import subprocess
-import sys
-import time
-import unittest
+"""
+Integration tests for exercising docker-py against Podman Service.
+"""
 
-from docker import DockerClient
-
-from test.python.docker import Podman, constant
+# pylint: disable=no-name-in-module,import-error,wrong-import-order
+from test.python.docker import constant
 from test.python.docker.compat import common
 
 
-class TestSystem(unittest.TestCase):
-    podman = None  # initialized podman configuration for tests
-    service = None  # podman service instance
-    topContainerId = ""
-
-    def setUp(self):
-        super().setUp()
-        self.client = DockerClient(base_url="tcp://127.0.0.1:8080", timeout=15)
-
-        TestSystem.podman.restore_image_from_cache(self.client)
-        TestSystem.topContainerId = common.run_top_container(self.client)
-
-    def tearDown(self):
-        common.remove_all_containers(self.client)
-        common.remove_all_images(self.client)
-        self.client.close()
-        return super().tearDown()
-
-    @classmethod
-    def setUpClass(cls):
-        super().setUpClass()
-        TestSystem.podman = Podman()
-        TestSystem.service = TestSystem.podman.open(
-            "system", "service", "tcp:127.0.0.1:8080", "--time=0"
-        )
-        # give the service some time to be ready...
-        time.sleep(2)
-
-        returncode = TestSystem.service.poll()
-        if returncode is not None:
-            raise subprocess.CalledProcessError(returncode, "podman system service")
-
-    @classmethod
-    def tearDownClass(cls):
-        TestSystem.service.terminate()
-        stdout, stderr = TestSystem.service.communicate(timeout=0.5)
-        if stdout:
-            sys.stdout.write("\nImages Service Stdout:\n" + stdout.decode("utf-8"))
-        if stderr:
-            sys.stderr.write("\nImAges Service Stderr:\n" + stderr.decode("utf-8"))
+# pylint: disable=missing-function-docstring
+class TestSystem(common.DockerTestCase):
+    """TestCase for exercising Podman system services."""
 
-        TestSystem.podman.tear_down()
-        return super().tearDownClass()
-
-    def test_Info(self):
-        info = self.client.info()
+    def test_info(self):
+        info = self.docker.info()
         self.assertIsNotNone(info)
         self.assertEqual(info["RegistryConfig"]["IndexConfigs"]["localhost:5000"]["Secure"], False)
-        self.assertEqual(info["RegistryConfig"]["IndexConfigs"]["localhost:5000"]["Mirrors"], ["mirror.localhost:5000"])
+        self.assertEqual(
+            info["RegistryConfig"]["IndexConfigs"]["localhost:5000"]["Mirrors"],
+            ["mirror.localhost:5000"],
+        )
 
     def test_info_container_details(self):
-        info = self.client.info()
+        info = self.docker.info()
         self.assertEqual(info["Containers"], 1)
-        self.client.containers.create(image=constant.ALPINE)
-        info = self.client.info()
+        self.docker.containers.create(image=constant.ALPINE)
+        info = self.docker.info()
         self.assertEqual(info["Containers"], 2)
 
     def test_version(self):
-        version = self.client.version()
+        version = self.docker.version()
         self.assertIsNotNone(version["Platform"]["Name"])
diff --git a/test/python/docker/conftest.py b/test/python/docker/conftest.py
new file mode 100644
index 000000000..c63780fa8
--- /dev/null
+++ b/test/python/docker/conftest.py
@@ -0,0 +1,8 @@
+"""
+Configure pytest
+"""
+
+
+def pytest_report_header(config):
+    """Add header to report."""
+    return "python client -- DockerClient"