Do not require mock in Python 3 in apache module (#7896)

Part of #7886.

This PR conditionally installs mock in `apache/setup.py` based on setuptools version and python version, when possible. It then updates `apache` tests to use `unittest.mock` when `mock` isn't available.

* Conditionally install mock in apache

* error out on newer python and older setuptools

* error when trying to build wheels with old setuptools

* use unittest.mock when third-party mock isn't available in apache, with no cover and type ignore

certbot-apache/setup.py

@@ -1,5 +1,7 @@
+from distutils.version import StrictVersion
 import sys
 
+from setuptools import __version__ as setuptools_version
 from setuptools import find_packages
 from setuptools import setup
 from setuptools.command.test import test as TestCommand
@@ -11,13 +13,21 @@ version = '1.4.0.dev0'
 install_requires = [
     'acme>=0.29.0',
     'certbot>=1.1.0',
-    'mock',
     'python-augeas',
     'setuptools',
     'zope.component',
     'zope.interface',
 ]
 
+setuptools_known_environment_markers = (StrictVersion(setuptools_version) >= StrictVersion('36.2'))
+if setuptools_known_environment_markers:
+    install_requires.append('mock ; python_version < "3.3"')
+elif 'bdist_wheel' in sys.argv[1:]:
+    raise RuntimeError('Error, you are trying to build certbot wheels using an old version '
+                       'of setuptools. Version 36.2+ of setuptools is required.')
+elif sys.version_info < (3,3):
+    install_requires.append('mock')
+
 dev_extras = [
     'apacheconfig>=0.3.2',
 ]

certbot-apache/tests/augeasnode_test.py

@@ -1,5 +1,8 @@
 """Tests for AugeasParserNode classes"""
-import mock
+try:
+    import mock
+except ImportError: # pragma: no cover
+    from unittest import mock # type: ignore
 
 import os
 import util

certbot-apache/tests/autohsts_test.py

@@ -3,7 +3,10 @@
 import re
 import unittest
 
-import mock
+try:
+    import mock
+except ImportError: # pragma: no cover
+    from unittest import mock # type: ignore
 import six  # pylint: disable=unused-import  # six is used in mock.patch()
 
 from certbot import errors

certbot-apache/tests/centos_test.py

@@ -1,7 +1,10 @@
 """Test for certbot_apache._internal.configurator for Centos overrides"""
 import unittest
 
-import mock
+try:
+    import mock
+except ImportError: # pragma: no cover
+    from unittest import mock # type: ignore
 
 from certbot import errors
 from certbot.compat import filesystem

certbot-apache/tests/configurator_reverter_test.py

@@ -2,7 +2,10 @@
 import shutil
 import unittest
 
-import mock
+try:
+    import mock
+except ImportError: # pragma: no cover
+    from unittest import mock # type: ignore
 
 from certbot import errors
 import util

certbot-apache/tests/configurator_test.py

@@ -6,7 +6,10 @@ import socket
 import tempfile
 import unittest
 
-import mock
+try:
+    import mock
+except ImportError: # pragma: no cover
+    from unittest import mock # type: ignore
 import six  # pylint: disable=unused-import  # six is used in mock.patch()
 
 from acme import challenges

certbot-apache/tests/debian_test.py

@@ -2,7 +2,10 @@
 import shutil
 import unittest
 
-import mock
+try:
+    import mock
+except ImportError: # pragma: no cover
+    from unittest import mock # type: ignore
 
 from certbot import errors
 from certbot.compat import os

certbot-apache/tests/display_ops_test.py

@@ -1,7 +1,10 @@
 """Test certbot_apache._internal.display_ops."""
 import unittest
 
-import mock
+try:
+    import mock
+except ImportError: # pragma: no cover
+    from unittest import mock # type: ignore
 
 from certbot import errors
 from certbot.display import util as display_util

certbot-apache/tests/dualnode_test.py

@@ -1,7 +1,10 @@
 """Tests for DualParserNode implementation"""
 import unittest
 
-import mock
+try:
+    import mock
+except ImportError: # pragma: no cover
+    from unittest import mock # type: ignore
 
 from certbot_apache._internal import assertions
 from certbot_apache._internal import augeasparser

certbot-apache/tests/entrypoint_test.py

@@ -1,7 +1,10 @@
 """Test for certbot_apache._internal.entrypoint for override class resolution"""
 import unittest
 
-import mock
+try:
+    import mock
+except ImportError: # pragma: no cover
+    from unittest import mock # type: ignore
 
 from certbot_apache._internal import configurator
 from certbot_apache._internal import entrypoint

certbot-apache/tests/fedora_test.py

@@ -1,7 +1,10 @@
 """Test for certbot_apache._internal.configurator for Fedora 29+ overrides"""
 import unittest
 
-import mock
+try:
+    import mock
+except ImportError: # pragma: no cover
+    from unittest import mock # type: ignore
 
 from certbot import errors
 from certbot.compat import filesystem

certbot-apache/tests/gentoo_test.py

@@ -1,7 +1,10 @@
 """Test for certbot_apache._internal.configurator for Gentoo overrides"""
 import unittest
 
-import mock
+try:
+    import mock
+except ImportError: # pragma: no cover
+    from unittest import mock # type: ignore
 
 from certbot import errors
 from certbot.compat import filesystem

certbot-apache/tests/http_01_test.py

@@ -2,7 +2,10 @@
 import unittest
 import errno
 
-import mock
+try:
+    import mock
+except ImportError: # pragma: no cover
+    from unittest import mock # type: ignore
 
 from acme import challenges
 from certbot import achallenges

certbot-apache/tests/parser_test.py

@@ -2,7 +2,10 @@
 import shutil
 import unittest
 
-import mock
+try:
+    import mock
+except ImportError: # pragma: no cover
+    from unittest import mock # type: ignore
 
 from certbot import errors
 from certbot.compat import os

certbot-apache/tests/parsernode_configurator_test.py

@@ -1,7 +1,10 @@
 """Tests for ApacheConfigurator for AugeasParserNode classes"""
 import unittest
 
-import mock
+try:
+    import mock
+except ImportError: # pragma: no cover
+    from unittest import mock # type: ignore
 
 import util
 

certbot-apache/tests/util.py

@@ -5,7 +5,10 @@ import unittest
 
 import augeas
 import josepy as jose
-import mock
+try:
+    import mock
+except ImportError: # pragma: no cover
+    from unittest import mock # type: ignore
 import zope.component
 
 from certbot.compat import os