We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
Remove dependency mock
Use `unittest.mock` instead.

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `setup.py`
Content:
```
1 # -*- coding: utf-8 -*-
2 
3 from setuptools import setup, find_packages
4 
5 
6 with open('VERSION.txt', 'r') as f:
7     pkg_version = f.read().strip()
8 
9 
10 def get_long_description():
11     with open('README.rst', 'r') as f:
12         return f.read()
13 
14 
15 install_requires = [
16     'beautifulsoup4 >= 4.1.1',
17     'django >= 2.0,<3.0',
18     'django-contrib-comments == 1.9.1',
19     'django-tinymce == 2.7.0',
20     'django-uuslug == 1.1.8',
21     'html2text',
22     'odfpy >= 0.9.6',
23     'python-bugzilla',
24     'xmltodict',
25     'kobo == 0.9.0'
26 ]
27 
28 extras_require = {
29     'mysql': ['mysqlclient >= 1.2.3'],
30     'pgsql': ['psycopg2 == 2.7.5'],
31 
32     # Required for tcms.auth.backends.KerberosBackend
33     'krbauth': [
34         'kerberos == 1.2.5'
35     ],
36 
37     # Packages for building documentation
38     'docs': [
39         'Sphinx >= 1.1.2',
40         'sphinx_rtd_theme',
41     ],
42 
43     # Necessary packages for running tests
44     'tests': [
45         'beautifulsoup4',
46         'coverage',
47         'factory_boy',
48         'flake8',
49         'mock',
50         'pytest',
51         'pytest-cov',
52         'pytest-django',
53     ],
54 
55     # Contain tools that assists the development
56     'devtools': [
57         'django-debug-toolbar',
58         'tox',
59         'django-extensions',
60         'pygraphviz',
61     ],
62 
63     # Required packages required to run async tasks
64     'async': [
65         'celery == 4.2.0',
66     ],
67 
68     'multiauth': [
69         'social-auth-app-django == 3.1.0',
70     ]
71 }
72 
73 setup(
74     name='nitrate-tcms',
75     version=pkg_version,
76     description='A full-featured Test Case Management System',
77     long_description=get_long_description(),
78     author='Nitrate Team',
79     maintainer='Chenxiong Qi',
80     maintainer_email='qcxhome@gmail.com',
81     url='https://github.com/Nitrate/Nitrate/',
82     license='GPLv2+',
83     keywords='test case',
84     install_requires=install_requires,
85     extras_require=extras_require,
86     python_requires='>=3.6',
87     package_dir={'': 'src'},
88     packages=find_packages('src', exclude=['test*']),
89     include_package_data=True,
90     zip_safe=False,
91     classifiers=[
92         'Framework :: Django',
93         'Framework :: Django :: 2.0',
94         'Framework :: Django :: 2.1',
95         'Framework :: Django :: 2.2',
96         'Intended Audience :: Developers',
97         'License :: OSI Approved :: GNU General Public License v2 or later (GPLv2+)',
98         'Programming Language :: Python :: 3',
99         'Programming Language :: Python :: 3.6',
100         'Programming Language :: Python :: 3.7',
101         'Programming Language :: Python :: 3 :: Only',
102         'Topic :: Software Development :: Quality Assurance',
103         'Topic :: Software Development :: Testing',
104     ],
105     project_urls={
106         'Issue Tracker': 'https://github.com/Nitrate/Nitrate/issues',
107         'Source Code': 'https://github.com/Nitrate/Nitrate',
108         'Documentation': 'https://nitrate.readthedocs.io/',
109     },
110 )
111
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/setup.py b/setup.py
--- a/setup.py
+++ b/setup.py
@@ -46,7 +46,6 @@
         'coverage',
         'factory_boy',
         'flake8',
-        'mock',
         'pytest',
         'pytest-cov',
         'pytest-django',

{"golden_diff": "diff --git a/setup.py b/setup.py\n--- a/setup.py\n+++ b/setup.py\n@@ -46,7 +46,6 @@\n         'coverage',\n         'factory_boy',\n         'flake8',\n-        'mock',\n         'pytest',\n         'pytest-cov',\n         'pytest-django',\n", "issue": "Remove dependency mock\nUse `unittest.mock` instead.\n", "before_files": [{"content": "# -*- coding: utf-8 -*-\n\nfrom setuptools import setup, find_packages\n\n\nwith open('VERSION.txt', 'r') as f:\n    pkg_version = f.read().strip()\n\n\ndef get_long_description():\n    with open('README.rst', 'r') as f:\n        return f.read()\n\n\ninstall_requires = [\n    'beautifulsoup4 >= 4.1.1',\n    'django >= 2.0,<3.0',\n    'django-contrib-comments == 1.9.1',\n    'django-tinymce == 2.7.0',\n    'django-uuslug == 1.1.8',\n    'html2text',\n    'odfpy >= 0.9.6',\n    'python-bugzilla',\n    'xmltodict',\n    'kobo == 0.9.0'\n]\n\nextras_require = {\n    'mysql': ['mysqlclient >= 1.2.3'],\n    'pgsql': ['psycopg2 == 2.7.5'],\n\n    # Required for tcms.auth.backends.KerberosBackend\n    'krbauth': [\n        'kerberos == 1.2.5'\n    ],\n\n    # Packages for building documentation\n    'docs': [\n        'Sphinx >= 1.1.2',\n        'sphinx_rtd_theme',\n    ],\n\n    # Necessary packages for running tests\n    'tests': [\n        'beautifulsoup4',\n        'coverage',\n        'factory_boy',\n        'flake8',\n        'mock',\n        'pytest',\n        'pytest-cov',\n        'pytest-django',\n    ],\n\n    # Contain tools that assists the development\n    'devtools': [\n        'django-debug-toolbar',\n        'tox',\n        'django-extensions',\n        'pygraphviz',\n    ],\n\n    # Required packages required to run async tasks\n    'async': [\n        'celery == 4.2.0',\n    ],\n\n    'multiauth': [\n        'social-auth-app-django == 3.1.0',\n    ]\n}\n\nsetup(\n    name='nitrate-tcms',\n    version=pkg_version,\n    description='A full-featured Test Case Management System',\n    long_description=get_long_description(),\n    author='Nitrate Team',\n    maintainer='Chenxiong Qi',\n    maintainer_email='qcxhome@gmail.com',\n    url='https://github.com/Nitrate/Nitrate/',\n    license='GPLv2+',\n    keywords='test case',\n    install_requires=install_requires,\n    extras_require=extras_require,\n    python_requires='>=3.6',\n    package_dir={'': 'src'},\n    packages=find_packages('src', exclude=['test*']),\n    include_package_data=True,\n    zip_safe=False,\n    classifiers=[\n        'Framework :: Django',\n        'Framework :: Django :: 2.0',\n        'Framework :: Django :: 2.1',\n        'Framework :: Django :: 2.2',\n        'Intended Audience :: Developers',\n        'License :: OSI Approved :: GNU General Public License v2 or later (GPLv2+)',\n        'Programming Language :: Python :: 3',\n        'Programming Language :: Python :: 3.6',\n        'Programming Language :: Python :: 3.7',\n        'Programming Language :: Python :: 3 :: Only',\n        'Topic :: Software Development :: Quality Assurance',\n        'Topic :: Software Development :: Testing',\n    ],\n    project_urls={\n        'Issue Tracker': 'https://github.com/Nitrate/Nitrate/issues',\n        'Source Code': 'https://github.com/Nitrate/Nitrate',\n        'Documentation': 'https://nitrate.readthedocs.io/',\n    },\n)\n", "path": "setup.py"}], "after_files": [{"content": "# -*- coding: utf-8 -*-\n\nfrom setuptools import setup, find_packages\n\n\nwith open('VERSION.txt', 'r') as f:\n    pkg_version = f.read().strip()\n\n\ndef get_long_description():\n    with open('README.rst', 'r') as f:\n        return f.read()\n\n\ninstall_requires = [\n    'beautifulsoup4 >= 4.1.1',\n    'django >= 2.0,<3.0',\n    'django-contrib-comments == 1.9.1',\n    'django-tinymce == 2.7.0',\n    'django-uuslug == 1.1.8',\n    'html2text',\n    'odfpy >= 0.9.6',\n    'python-bugzilla',\n    'xmltodict',\n    'kobo == 0.9.0'\n]\n\nextras_require = {\n    'mysql': ['mysqlclient >= 1.2.3'],\n    'pgsql': ['psycopg2 == 2.7.5'],\n\n    # Required for tcms.auth.backends.KerberosBackend\n    'krbauth': [\n        'kerberos == 1.2.5'\n    ],\n\n    # Packages for building documentation\n    'docs': [\n        'Sphinx >= 1.1.2',\n        'sphinx_rtd_theme',\n    ],\n\n    # Necessary packages for running tests\n    'tests': [\n        'beautifulsoup4',\n        'coverage',\n        'factory_boy',\n        'flake8',\n        'pytest',\n        'pytest-cov',\n        'pytest-django',\n    ],\n\n    # Contain tools that assists the development\n    'devtools': [\n        'django-debug-toolbar',\n        'tox',\n        'django-extensions',\n        'pygraphviz',\n    ],\n\n    # Required packages required to run async tasks\n    'async': [\n        'celery == 4.2.0',\n    ],\n\n    'multiauth': [\n        'social-auth-app-django == 3.1.0',\n    ]\n}\n\nsetup(\n    name='nitrate-tcms',\n    version=pkg_version,\n    description='A full-featured Test Case Management System',\n    long_description=get_long_description(),\n    author='Nitrate Team',\n    maintainer='Chenxiong Qi',\n    maintainer_email='qcxhome@gmail.com',\n    url='https://github.com/Nitrate/Nitrate/',\n    license='GPLv2+',\n    keywords='test case',\n    install_requires=install_requires,\n    extras_require=extras_require,\n    python_requires='>=3.6',\n    package_dir={'': 'src'},\n    packages=find_packages('src', exclude=['test*']),\n    include_package_data=True,\n    zip_safe=False,\n    classifiers=[\n        'Framework :: Django',\n        'Framework :: Django :: 2.0',\n        'Framework :: Django :: 2.1',\n        'Framework :: Django :: 2.2',\n        'Intended Audience :: Developers',\n        'License :: OSI Approved :: GNU General Public License v2 or later (GPLv2+)',\n        'Programming Language :: Python :: 3',\n        'Programming Language :: Python :: 3.6',\n        'Programming Language :: Python :: 3.7',\n        'Programming Language :: Python :: 3 :: Only',\n        'Topic :: Software Development :: Quality Assurance',\n        'Topic :: Software Development :: Testing',\n    ],\n    project_urls={\n        'Issue Tracker': 'https://github.com/Nitrate/Nitrate/issues',\n        'Source Code': 'https://github.com/Nitrate/Nitrate',\n        'Documentation': 'https://nitrate.readthedocs.io/',\n    },\n)\n", "path": "setup.py"}]}