Don't install mock backport

Signed-off-by: Hugo van Kemenade <hugovk@users.noreply.github.com>
diff --git a/test-requirements.txt b/test-requirements.txt
index d135792..ccc97be 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,7 +1,6 @@
 setuptools==58.2.0
 coverage==6.0.1
 flake8==4.0.1
-mock==1.0.1
 pytest==6.2.5
 pytest-cov==3.0.0
 pytest-timeout==2.0.1
diff --git a/tests/integration/credentials/utils_test.py b/tests/integration/credentials/utils_test.py
index d7b2a1a..acf018d 100644
--- a/tests/integration/credentials/utils_test.py
+++ b/tests/integration/credentials/utils_test.py
@@ -1,11 +1,7 @@
 import os
 
 from docker.credentials.utils import create_environment_dict
-
-try:
-    from unittest import mock
-except ImportError:
-    from unittest import mock
+from unittest import mock
 
 
 @mock.patch.dict(os.environ)
diff --git a/tests/unit/api_container_test.py b/tests/unit/api_container_test.py
index 1ebd37d..a66aea0 100644
--- a/tests/unit/api_container_test.py
+++ b/tests/unit/api_container_test.py
@@ -4,6 +4,7 @@
 
 import docker
 from docker.api import APIClient
+from unittest import mock
 import pytest
 
 from . import fake_api
@@ -13,11 +14,6 @@
     fake_inspect_container, url_base
 )
 
-try:
-    from unittest import mock
-except ImportError:
-    from unittest import mock
-
 
 def fake_inspect_container_tty(self, container):
     return fake_inspect_container(self, container, tty=True)
diff --git a/tests/unit/api_image_test.py b/tests/unit/api_image_test.py
index 843c11b..8fb3e9d 100644
--- a/tests/unit/api_image_test.py
+++ b/tests/unit/api_image_test.py
@@ -3,16 +3,12 @@
 
 from . import fake_api
 from docker import auth
+from unittest import mock
 from .api_test import (
     BaseAPIClientTest, fake_request, DEFAULT_TIMEOUT_SECONDS, url_prefix,
     fake_resolve_authconfig
 )
 
-try:
-    from unittest import mock
-except ImportError:
-    from unittest import mock
-
 
 class ImageTest(BaseAPIClientTest):
     def test_image_viz(self):
diff --git a/tests/unit/api_network_test.py b/tests/unit/api_network_test.py
index 84d6544..8afab73 100644
--- a/tests/unit/api_network_test.py
+++ b/tests/unit/api_network_test.py
@@ -2,11 +2,7 @@
 
 from .api_test import BaseAPIClientTest, url_prefix, response
 from docker.types import IPAMConfig, IPAMPool
-
-try:
-    from unittest import mock
-except ImportError:
-    from unittest import mock
+from unittest import mock
 
 
 class NetworkTest(BaseAPIClientTest):
diff --git a/tests/unit/api_test.py b/tests/unit/api_test.py
index dfc3816..3234e55 100644
--- a/tests/unit/api_test.py
+++ b/tests/unit/api_test.py
@@ -19,14 +19,10 @@
 from docker.api import APIClient
 from docker.constants import DEFAULT_DOCKER_API_VERSION
 from requests.packages import urllib3
+from unittest import mock
 
 from . import fake_api
 
-try:
-    from unittest import mock
-except ImportError:
-    from unittest import mock
-
 
 DEFAULT_TIMEOUT_SECONDS = docker.constants.DEFAULT_TIMEOUT_SECONDS
 
diff --git a/tests/unit/auth_test.py b/tests/unit/auth_test.py
index 8bd2e16..ea953af 100644
--- a/tests/unit/auth_test.py
+++ b/tests/unit/auth_test.py
@@ -8,14 +8,9 @@
 import unittest
 
 from docker import auth, credentials, errors
+from unittest import mock
 import pytest
 
-try:
-    from unittest import mock
-except ImportError:
-    from unittest import mock
-
-
 class RegressionTest(unittest.TestCase):
     def test_803_urlsafe_encode(self):
         auth_data = {
diff --git a/tests/unit/client_test.py b/tests/unit/client_test.py
index d647d3a..e7c7eec 100644
--- a/tests/unit/client_test.py
+++ b/tests/unit/client_test.py
@@ -9,14 +9,10 @@
     DEFAULT_MAX_POOL_SIZE, IS_WINDOWS_PLATFORM
 )
 from docker.utils import kwargs_from_env
+from unittest import mock
 
 from . import fake_api
 
-try:
-    from unittest import mock
-except ImportError:
-    from unittest import mock
-
 TEST_CERT_DIR = os.path.join(os.path.dirname(__file__), 'testdata/certs')
 POOL_SIZE = 20
 
diff --git a/tests/unit/dockertypes_test.py b/tests/unit/dockertypes_test.py
index a0a171b..76a99a6 100644
--- a/tests/unit/dockertypes_test.py
+++ b/tests/unit/dockertypes_test.py
@@ -9,11 +9,7 @@
     IPAMPool, LogConfig, Mount, ServiceMode, Ulimit,
 )
 from docker.types.services import convert_service_ports
-
-try:
-    from unittest import mock
-except:  # noqa: E722
-    from unittest import mock
+from unittest import mock
 
 
 def create_host_config(*args, **kwargs):
diff --git a/tests/unit/fake_api_client.py b/tests/unit/fake_api_client.py
index 1663ef1..95cf63b 100644
--- a/tests/unit/fake_api_client.py
+++ b/tests/unit/fake_api_client.py
@@ -2,13 +2,9 @@
 
 import docker
 from docker.constants import DEFAULT_DOCKER_API_VERSION
+from unittest import mock
 from . import fake_api
 
-try:
-    from unittest import mock
-except ImportError:
-    from unittest import mock
-
 
 class CopyReturnMagicMock(mock.MagicMock):
     """
diff --git a/tests/unit/utils_config_test.py b/tests/unit/utils_config_test.py
index 83e04a1..27d5a7c 100644
--- a/tests/unit/utils_config_test.py
+++ b/tests/unit/utils_config_test.py
@@ -5,14 +5,10 @@
 import json
 
 from pytest import mark, fixture
+from unittest import mock
 
 from docker.utils import config
 
-try:
-    from unittest import mock
-except ImportError:
-    from unittest import mock
-
 
 class FindConfigFileTest(unittest.TestCase):