Merge branch 'master' into feature/2093-docs-revampfeature/2093-docs-revamp

32 files changed, 177 insertions, 303 deletions

diff --git a/setuptools/tests/__init__.py b/setuptools/tests/__init__.py
index 6377d785..a7a2112f 100644
--- a/setuptools/tests/__init__.py
+++ b/setuptools/tests/__init__.py
@@ -2,19 +2,12 @@ import locale
 
 import pytest
 
-from setuptools.extern.six import PY2, PY3
 
-
-__all__ = [
-    'fail_on_ascii', 'py2_only', 'py3_only', 'ack_2to3'
-]
+__all__ = ['fail_on_ascii', 'ack_2to3']
 
 
 is_ascii = locale.getpreferredencoding() == 'ANSI_X3.4-1968'
 fail_on_ascii = pytest.mark.xfail(is_ascii, reason="Test fails in this locale")
 
 
-py2_only = pytest.mark.skipif(not PY2, reason="Test runs on Python 2 only")
-py3_only = pytest.mark.skipif(not PY3, reason="Test runs on Python 3 only")
-
 ack_2to3 = pytest.mark.filterwarnings('ignore:2to3 support is deprecated')
diff --git a/setuptools/tests/contexts.py b/setuptools/tests/contexts.py
index 535ae107..51ce8984 100644
--- a/setuptools/tests/contexts.py
+++ b/setuptools/tests/contexts.py
@@ -4,8 +4,8 @@ import shutil
 import sys
 import contextlib
 import site
+import io
 
-from setuptools.extern import six
 import pkg_resources
 
 
@@ -58,8 +58,8 @@ def quiet():
 
     old_stdout = sys.stdout
     old_stderr = sys.stderr
-    new_stdout = sys.stdout = six.StringIO()
-    new_stderr = sys.stderr = six.StringIO()
+    new_stdout = sys.stdout = io.StringIO()
+    new_stderr = sys.stderr = io.StringIO()
     try:
         yield new_stdout, new_stderr
     finally:
diff --git a/setuptools/tests/files.py b/setuptools/tests/files.py
index bad2189d..71194b9d 100644
--- a/setuptools/tests/files.py
+++ b/setuptools/tests/files.py
@@ -1,9 +1,6 @@
 import os
 
 
-import pkg_resources.py31compat
-
-
 def build_files(file_defs, prefix=""):
     """
     Build a set of files/directories, as described by the
@@ -30,7 +27,7 @@ def build_files(file_defs, prefix=""):
     for name, contents in file_defs.items():
         full_name = os.path.join(prefix, name)
         if isinstance(contents, dict):
-            pkg_resources.py31compat.makedirs(full_name, exist_ok=True)
+            os.makedirs(full_name, exist_ok=True)
             build_files(contents, prefix=full_name)
         else:
             if isinstance(contents, bytes):
diff --git a/setuptools/tests/namespaces.py b/setuptools/tests/namespaces.py
index ef5ecdad..245cf8ea 100644
--- a/setuptools/tests/namespaces.py
+++ b/setuptools/tests/namespaces.py
@@ -1,5 +1,3 @@
-from __future__ import absolute_import, unicode_literals
-
 import textwrap
 
 
diff --git a/setuptools/tests/requirements.txt b/setuptools/tests/requirements.txt
index 19bf5aef..d0d07f70 100644
--- a/setuptools/tests/requirements.txt
+++ b/setuptools/tests/requirements.txt
@@ -10,3 +10,4 @@ pytest-cov>=2.5.1
 paver; python_version>="3.6"
 futures; python_version=="2.7"
 pip>=19.1 # For proper file:// URLs support.
+jaraco.envs
diff --git a/setuptools/tests/server.py b/setuptools/tests/server.py
index 8b17b081..7e213230 100644
--- a/setuptools/tests/server.py
+++ b/setuptools/tests/server.py
@@ -4,13 +4,12 @@
 import os
 import time
 import threading
+import http.server
+import urllib.parse
+import urllib.request
 
-from setuptools.extern.six.moves import BaseHTTPServer, SimpleHTTPServer
-from setuptools.extern.six.moves.urllib_parse import urljoin
-from setuptools.extern.six.moves.urllib.request import pathname2url
 
-
-class IndexServer(BaseHTTPServer.HTTPServer):
+class IndexServer(http.server.HTTPServer):
     """Basic single-threaded http server simulating a package index
 
     You can use this server in unittest like this::
@@ -24,8 +23,8 @@ class IndexServer(BaseHTTPServer.HTTPServer):
 
     def __init__(
             self, server_address=('', 0),
-            RequestHandlerClass=SimpleHTTPServer.SimpleHTTPRequestHandler):
-        BaseHTTPServer.HTTPServer.__init__(
+            RequestHandlerClass=http.server.SimpleHTTPRequestHandler):
+        http.server.HTTPServer.__init__(
             self, server_address, RequestHandlerClass)
         self._run = True
 
@@ -48,14 +47,14 @@ class IndexServer(BaseHTTPServer.HTTPServer):
         return 'http://127.0.0.1:%s/setuptools/tests/indexes/' % port
 
 
-class RequestRecorder(BaseHTTPServer.BaseHTTPRequestHandler):
+class RequestRecorder(http.server.BaseHTTPRequestHandler):
     def do_GET(self):
         requests = vars(self.server).setdefault('requests', [])
         requests.append(self)
         self.send_response(200, 'OK')
 
 
-class MockServer(BaseHTTPServer.HTTPServer, threading.Thread):
+class MockServer(http.server.HTTPServer, threading.Thread):
     """
     A simple HTTP Server that records the requests made to it.
     """
@@ -63,7 +62,7 @@ class MockServer(BaseHTTPServer.HTTPServer, threading.Thread):
     def __init__(
             self, server_address=('', 0),
             RequestHandlerClass=RequestRecorder):
-        BaseHTTPServer.HTTPServer.__init__(
+        http.server.HTTPServer.__init__(
             self, server_address, RequestHandlerClass)
         threading.Thread.__init__(self)
         self.setDaemon(True)
@@ -87,5 +86,5 @@ def path_to_url(path, authority=None):
     base = 'file:'
     if authority is not None:
         base += '//' + authority
-    url = urljoin(base, pathname2url(path))
+    url = urllib.parse.urljoin(base, urllib.request.pathname2url(path))
     return url
diff --git a/setuptools/tests/test_archive_util.py b/setuptools/tests/test_archive_util.py
index b789e9ac..7f996244 100644
--- a/setuptools/tests/test_archive_util.py
+++ b/setuptools/tests/test_archive_util.py
@@ -3,8 +3,6 @@
 import tarfile
 import io
 
-from setuptools.extern import six
-
 import pytest
 
 from setuptools import archive_util
@@ -22,8 +20,6 @@ def tarfile_with_unicode(tmpdir):
         data = b""
 
         filename = "testimäge.png"
-        if six.PY2:
-            filename = filename.decode('utf-8')
 
         t = tarfile.TarInfo(filename)
         t.size = len(data)
@@ -39,4 +35,4 @@ def tarfile_with_unicode(tmpdir):
 @pytest.mark.xfail(reason="#710 and #712")
 def test_unicode_files(tarfile_with_unicode, tmpdir):
     target = tmpdir / 'out'
-    archive_util.unpack_archive(tarfile_with_unicode, six.text_type(target))
+    archive_util.unpack_archive(tarfile_with_unicode, str(target))
diff --git a/setuptools/tests/test_build_ext.py b/setuptools/tests/test_build_ext.py
index 3dc87ca3..838fdb42 100644
--- a/setuptools/tests/test_build_ext.py
+++ b/setuptools/tests/test_build_ext.py
@@ -2,8 +2,6 @@ import sys
 import distutils.command.build_ext as orig
 from distutils.sysconfig import get_config_var
 
-from setuptools.extern import six
-
 from setuptools.command.build_ext import build_ext, get_abi3_suffix
 from setuptools.dist import Distribution
 from setuptools.extension import Extension
@@ -41,8 +39,8 @@ class TestBuildExt:
         assert 'spam.eggs' in cmd.ext_map
         res = cmd.get_ext_filename('spam.eggs')
 
-        if six.PY2 or not get_abi3_suffix():
-            assert res.endswith(get_config_var('SO'))
+        if not get_abi3_suffix():
+            assert res.endswith(get_config_var('EXT_SUFFIX'))
         elif sys.platform == 'win32':
             assert res.endswith('eggs.pyd')
         else:
diff --git a/setuptools/tests/test_build_meta.py b/setuptools/tests/test_build_meta.py
index 8fcf3055..5462b26a 100644
--- a/setuptools/tests/test_build_meta.py
+++ b/setuptools/tests/test_build_meta.py
@@ -1,20 +1,13 @@
-from __future__ import unicode_literals
-
 import os
 import shutil
 import tarfile
+import importlib
+from concurrent import futures
 
 import pytest
 
 from .files import build_files
 from .textwrap import DALS
-from . import py2_only
-
-__metaclass__ = type
-
-# Backports on Python 2.7
-import importlib
-from concurrent import futures
 
 
 class BuildBackendBase:
@@ -220,15 +213,6 @@ class TestBuildMetaBackend:
 
         assert os.path.isfile(os.path.join(dist_dir, dist_info, 'METADATA'))
 
-    @py2_only
-    def test_prepare_metadata_for_build_wheel_with_str(self, build_backend):
-        dist_dir = os.path.abspath(str('pip-dist-info'))
-        os.makedirs(dist_dir)
-
-        dist_info = build_backend.prepare_metadata_for_build_wheel(dist_dir)
-
-        assert os.path.isfile(os.path.join(dist_dir, dist_info, 'METADATA'))
-
     def test_build_sdist_explicit_dist(self, build_backend):
         # explicitly specifying the dist folder should work
         # the folder sdist_directory and the ``--dist-dir`` can be the same
@@ -380,7 +364,7 @@ class TestBuildMetaBackend:
                 setup(
                     name="qux",
                     version="0.0.0",
-                    py_modules=["hello.py"],
+                    py_modules=["hello"],
                     setup_requires={setup_literal},
                 )
             """).format(setup_literal=setup_literal),
@@ -407,6 +391,35 @@ class TestBuildMetaBackend:
 
         assert expected == sorted(actual)
 
+    def test_dont_install_setup_requires(self, tmpdir_cwd):
+        files = {
+            'setup.py': DALS("""
+                        from setuptools import setup
+
+                        setup(
+                            name="qux",
+                            version="0.0.0",
+                            py_modules=["hello"],
+                            setup_requires=["does-not-exist >99"],
+                        )
+                    """),
+            'hello.py': DALS("""
+                    def run():
+                        print('hello')
+                    """),
+        }
+
+        build_files(files)
+
+        build_backend = self.get_build_backend()
+
+        dist_dir = os.path.abspath('pip-dist-info')
+        os.makedirs(dist_dir)
+
+        # does-not-exist can't be satisfied, so if it attempts to install
+        # setup_requires, it will fail.
+        build_backend.prepare_metadata_for_build_wheel(dist_dir)
+
     _sys_argv_0_passthrough = {
         'setup.py': DALS("""
             import os
diff --git a/setuptools/tests/test_config.py b/setuptools/tests/test_config.py
index 67992c04..1dee1271 100644
--- a/setuptools/tests/test_config.py
+++ b/setuptools/tests/test_config.py
@@ -1,7 +1,5 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 import contextlib
+import configparser
 
 import pytest
 
@@ -9,9 +7,6 @@ from distutils.errors import DistutilsOptionError, DistutilsFileError
 from mock import patch
 from setuptools.dist import Distribution, _Distribution
 from setuptools.config import ConfigHandler, read_configuration
-from setuptools.extern.six.moves import configparser
-from setuptools.extern import six
-from . import py2_only, py3_only
 from .textwrap import DALS
 
 
@@ -311,10 +306,6 @@ class TestMetadata:
         with get_dist(tmpdir) as dist:
             assert dist.metadata.version == '2016.11.26'
 
-        if six.PY2:
-            # static version loading is unsupported on Python 2
-            return
-
         config.write(
             '[metadata]\n'
             'version = attr: fake_package.subpkg_b.mod.VERSION\n'
@@ -719,19 +710,6 @@ class TestOptions:
             assert set(dist.packages) == set(
                 ['fake_package', 'fake_package.sub_two'])
 
-    @py2_only
-    def test_find_namespace_directive_fails_on_py2(self, tmpdir):
-        dir_package, config = fake_env(
-            tmpdir,
-            '[options]\n'
-            'packages = find_namespace:\n'
-        )
-
-        with pytest.raises(DistutilsOptionError):
-            with get_dist(tmpdir) as dist:
-                dist.parse_config_files()
-
-    @py3_only
     def test_find_namespace_directive(self, tmpdir):
         dir_package, config = fake_env(
             tmpdir,
diff --git a/setuptools/tests/test_develop.py b/setuptools/tests/test_develop.py
index bb89a865..9854420e 100644
--- a/setuptools/tests/test_develop.py
+++ b/setuptools/tests/test_develop.py
@@ -1,8 +1,6 @@
 """develop tests
 """
 
-from __future__ import absolute_import, unicode_literals
-
 import os
 import site
 import sys
@@ -10,7 +8,6 @@ import io
 import subprocess
 import platform
 
-from setuptools.extern import six
 from setuptools.command import test
 
 import pytest
@@ -97,7 +94,7 @@ class TestDevelop:
         with io.open(fn) as init_file:
             init = init_file.read().strip()
 
-        expected = 'print "foo"' if six.PY2 else 'print("foo")'
+        expected = 'print("foo")'
         assert init == expected
 
     def test_console_scripts(self, tmpdir):
@@ -163,7 +160,7 @@ class TestNamespaces:
         reason="https://github.com/pypa/setuptools/issues/851",
     )
     @pytest.mark.skipif(
-        platform.python_implementation() == 'PyPy' and not six.PY2,
+        platform.python_implementation() == 'PyPy',
         reason="https://github.com/pypa/setuptools/issues/1202",
     )
     def test_namespace_package_importable(self, tmpdir):
diff --git a/setuptools/tests/test_dist.py b/setuptools/tests/test_dist.py
index 531ea1b4..cb47fb58 100644
--- a/setuptools/tests/test_dist.py
+++ b/setuptools/tests/test_dist.py
@@ -1,11 +1,9 @@
-# -*- coding: utf-8 -*-
-
-from __future__ import unicode_literals
-
 import io
 import collections
 import re
 import functools
+import urllib.request
+import urllib.parse
 from distutils.errors import DistutilsSetupError
 from setuptools.dist import (
     _get_unpatched,
@@ -14,9 +12,6 @@ from setuptools.dist import (
 )
 from setuptools import sic
 from setuptools import Distribution
-from setuptools.extern.six.moves.urllib.request import pathname2url
-from setuptools.extern.six.moves.urllib_parse import urljoin
-from setuptools.extern import six
 
 from .textwrap import DALS
 from .test_easy_install import make_nspkg_sdist
@@ -29,7 +24,8 @@ def test_dist_fetch_build_egg(tmpdir):
     Check multiple calls to `Distribution.fetch_build_egg` work as expected.
     """
     index = tmpdir.mkdir('index')
-    index_url = urljoin('file://', pathname2url(str(index)))
+    index_url = urllib.parse.urljoin(
+        'file://', urllib.request.pathname2url(str(index)))
 
     def sdist_with_index(distname, version):
         dist_dir = index.mkdir(distname)
@@ -63,8 +59,7 @@ def test_dist_fetch_build_egg(tmpdir):
             dist.fetch_build_egg(r)
             for r in reqs
         ]
-    # noqa below because on Python 2 it causes flakes
-    assert [dist.key for dist in resolved_dists if dist] == reqs  # noqa
+    assert [dist.key for dist in resolved_dists if dist] == reqs
 
 
 def test_dist__get_unpatched_deprecated():
@@ -150,10 +145,7 @@ def test_read_metadata(name, attrs):
     dist_class = metadata_out.__class__
 
     # Write to PKG_INFO and then load into a new metadata object
-    if six.PY2:
-        PKG_INFO = io.BytesIO()
-    else:
-        PKG_INFO = io.StringIO()
+    PKG_INFO = io.StringIO()
 
     metadata_out.write_pkg_file(PKG_INFO)
 
diff --git a/setuptools/tests/test_dist_info.py b/setuptools/tests/test_dist_info.py
index f7e7d2bf..29fbd09d 100644
--- a/setuptools/tests/test_dist_info.py
+++ b/setuptools/tests/test_dist_info.py
@@ -1,10 +1,6 @@
 """Test .dist-info style distributions.
 """
 
-from __future__ import unicode_literals
-
-from setuptools.extern.six.moves import map
-
 import pytest
 
 import pkg_resources
diff --git a/setuptools/tests/test_distutils_adoption.py b/setuptools/tests/test_distutils_adoption.py
new file mode 100644
index 00000000..a53773df
--- /dev/null
+++ b/setuptools/tests/test_distutils_adoption.py
@@ -0,0 +1,71 @@
+import os
+import sys
+import functools
+import subprocess
+import platform
+
+import pytest
+import jaraco.envs
+import path
+
+
+IS_PYPY = '__pypy__' in sys.builtin_module_names
+
+
+class VirtualEnv(jaraco.envs.VirtualEnv):
+    name = '.env'
+
+    def run(self, cmd, *args, **kwargs):
+        cmd = [self.exe(cmd[0])] + cmd[1:]
+        return subprocess.check_output(cmd, *args, cwd=self.root, **kwargs)
+
+
+@pytest.fixture
+def venv(tmpdir):
+    env = VirtualEnv()
+    env.root = path.Path(tmpdir)
+    env.req = os.getcwd()
+    return env.create()
+
+
+def popen_text(call):
+    """
+    Augment the Popen call with the parameters to ensure unicode text.
+    """
+    return functools.partial(call, universal_newlines=True) \
+        if sys.version_info < (3, 7) else functools.partial(call, text=True)
+
+
+def find_distutils(venv, imports='distutils', env=None, **kwargs):
+    py_cmd = 'import {imports}; print(distutils.__file__)'.format(**locals())
+    cmd = ['python', '-c', py_cmd]
+    if platform.system() == 'Windows':
+        env['SYSTEMROOT'] = os.environ['SYSTEMROOT']
+    return popen_text(venv.run)(cmd, env=env, **kwargs)
+
+
+def test_distutils_stdlib(venv):
+    """
+    Ensure stdlib distutils is used when appropriate.
+    """
+    env = dict(SETUPTOOLS_USE_DISTUTILS='stdlib')
+    assert venv.name not in find_distutils(venv, env=env).split(os.sep)
+
+
+def test_distutils_local_with_setuptools(venv):
+    """
+    Ensure local distutils is used when appropriate.
+    """
+    env = dict(SETUPTOOLS_USE_DISTUTILS='local')
+    loc = find_distutils(venv, imports='setuptools, distutils', env=env)
+    assert venv.name in loc.split(os.sep)
+
+
+@pytest.mark.xfail('IS_PYPY', reason='pypy imports distutils on startup')
+def test_distutils_local(venv):
+    """
+    Even without importing, the setuptools-local copy of distutils is
+    preferred.
+    """
+    env = dict(SETUPTOOLS_USE_DISTUTILS='local')
+    assert venv.name in find_distutils(venv, env=env).split(os.sep)
diff --git a/setuptools/tests/test_easy_install.py b/setuptools/tests/test_easy_install.py
index 3044cbd0..26a5e9a6 100644
--- a/setuptools/tests/test_easy_install.py
+++ b/setuptools/tests/test_easy_install.py
@@ -1,7 +1,5 @@
-# -*- coding: utf-8 -*-
 """Easy install Tests
 """
-from __future__ import absolute_import, unicode_literals
 
 import sys
 import os
@@ -16,8 +14,7 @@ import io
 import zipfile
 import mock
 import time
-
-from setuptools.extern import six
+import re
 
 import pytest
 
@@ -40,8 +37,6 @@ from . import contexts
 from .files import build_files
 from .textwrap import DALS
 
-__metaclass__ = type
-
 
 class FakeDist:
     def get_entry_map(self, group):
@@ -61,35 +56,17 @@ SETUP_PY = DALS("""
 
 
 class TestEasyInstallTest:
-    def test_install_site_py(self, tmpdir):
-        dist = Distribution()
-        cmd = ei.easy_install(dist)
-        cmd.sitepy_installed = False
-        cmd.install_dir = str(tmpdir)
-        cmd.install_site_py()
-        assert (tmpdir / 'site.py').exists()
-
     def test_get_script_args(self):
         header = ei.CommandSpec.best().from_environment().as_header()
-        expected = header + DALS(r"""
-            # EASY-INSTALL-ENTRY-SCRIPT: 'spec','console_scripts','name'
-            __requires__ = 'spec'
-            import re
-            import sys
-            from pkg_resources import load_entry_point
-
-            if __name__ == '__main__':
-                sys.argv[0] = re.sub(r'(-script\.pyw?|\.exe)?$', '', sys.argv[0])
-                sys.exit(
-                    load_entry_point('spec', 'console_scripts', 'name')()
-                )
-            """)  # noqa: E501
         dist = FakeDist()
-
         args = next(ei.ScriptWriter.get_args(dist))
         name, script = itertools.islice(args, 2)
-
-        assert script == expected
+        assert script.startswith(header)
+        assert "'spec'" in script
+        assert "'console_scripts'" in script
+        assert "'name'" in script
+        assert re.search(
+            '^# EASY-INSTALL-ENTRY-SCRIPT', script, flags=re.MULTILINE)
 
     def test_no_find_links(self):
         # new option '--no-find-links', that blocks find-links added at
@@ -1001,8 +978,6 @@ def create_setup_requires_package(path, distname='foobar', version='0.1',
 )
 class TestScriptHeader:
     non_ascii_exe = '/Users/José/bin/python'
-    if six.PY2:
-        non_ascii_exe = non_ascii_exe.encode('utf-8')
     exe_with_spaces = r'C:\Program Files\Python36\python.exe'
 
     def test_get_script_header(self):
diff --git a/setuptools/tests/test_egg_info.py b/setuptools/tests/test_egg_info.py
index 109f9135..dc472af4 100644
--- a/setuptools/tests/test_egg_info.py
+++ b/setuptools/tests/test_egg_info.py
@@ -10,7 +10,6 @@ from setuptools.command.egg_info import (
     egg_info, manifest_maker, EggInfoDeprecationWarning, get_pkg_info_revision,
 )
 from setuptools.dist import Distribution
-from setuptools.extern.six.moves import map
 
 import pytest
 
@@ -19,8 +18,6 @@ from .files import build_files
 from .textwrap import DALS
 from . import contexts
 
-__metaclass__ = type
-
 
 class Environment(str):
     pass
@@ -73,8 +70,7 @@ class TestEggInfo:
         """
         When the egg_info section is empty or not present, running
         save_version_info should add the settings to the setup.cfg
-        in a deterministic order, consistent with the ordering found
-        on Python 2.7 with PYTHONHASHSEED=0.
+        in a deterministic order.
         """
         setup_cfg = os.path.join(env.paths['home'], 'setup.cfg')
         dist = Distribution()
@@ -906,49 +902,3 @@ class TestEggInfo:
 
     def test_get_pkg_info_revision_deprecated(self):
         pytest.warns(EggInfoDeprecationWarning, get_pkg_info_revision)
-
-    EGG_INFO_TESTS = (
-        # Check for issue #1136: invalid string type when
-        # reading declarative `setup.cfg` under Python 2.
-        {
-            'setup.py': DALS(
-                """
-                from setuptools import setup
-                setup(
-                    name="foo",
-                )
-                """),
-            'setup.cfg': DALS(
-                """
-                [options]
-                package_dir =
-                    = src
-                """),
-            'src': {},
-        },
-        # Check Unicode can be used in `setup.py` under Python 2.
-        {
-            'setup.py': DALS(
-                """
-                # -*- coding: utf-8 -*-
-                from __future__ import unicode_literals
-                from setuptools import setup, find_packages
-                setup(
-                    name="foo",
-                    package_dir={'': 'src'},
-                )
-                """),
-            'src': {},
-        }
-    )
-
-    @pytest.mark.parametrize('package_files', EGG_INFO_TESTS)
-    def test_egg_info(self, tmpdir_cwd, env, package_files):
-        """
-        """
-        build_files(package_files)
-        code, data = environment.run_setup_py(
-            cmd=['egg_info'],
-            data_stream=1,
-        )
-        assert not code, data
diff --git a/setuptools/tests/test_extern.py b/setuptools/tests/test_extern.py
index 3519a680..0d6b164f 100644
--- a/setuptools/tests/test_extern.py
+++ b/setuptools/tests/test_extern.py
@@ -3,7 +3,6 @@ import pickle
 
 from setuptools import Distribution
 from setuptools.extern import ordered_set
-from setuptools.tests import py3_only
 
 
 def test_reimport_extern():
@@ -17,6 +16,5 @@ def test_orderedset_pickle_roundtrip():
     assert o1 == o2
 
 
-@py3_only
 def test_distribution_picklable():
     pickle.loads(pickle.dumps(Distribution()))
diff --git a/setuptools/tests/test_find_packages.py b/setuptools/tests/test_find_packages.py
index ab26b4f1..906713f6 100644
--- a/setuptools/tests/test_find_packages.py
+++ b/setuptools/tests/test_find_packages.py
@@ -7,12 +7,8 @@ import platform
 
 import pytest
 
-from . import py3_only
-
-from setuptools.extern.six import PY3
 from setuptools import find_packages
-if PY3:
-    from setuptools import find_namespace_packages
+from setuptools import find_namespace_packages
 
 
 # modeled after CPython's test.support.can_symlink
@@ -154,34 +150,29 @@ class TestFindPackages:
     def _assert_packages(self, actual, expected):
         assert set(actual) == set(expected)
 
-    @py3_only
     def test_pep420_ns_package(self):
         packages = find_namespace_packages(
             self.dist_dir, include=['pkg*'], exclude=['pkg.subpkg.assets'])
         self._assert_packages(packages, ['pkg', 'pkg.nspkg', 'pkg.subpkg'])
 
-    @py3_only
     def test_pep420_ns_package_no_includes(self):
         packages = find_namespace_packages(
             self.dist_dir, exclude=['pkg.subpkg.assets'])
         self._assert_packages(
             packages, ['docs', 'pkg', 'pkg.nspkg', 'pkg.subpkg'])
 
-    @py3_only
     def test_pep420_ns_package_no_includes_or_excludes(self):
         packages = find_namespace_packages(self.dist_dir)
         expected = [
             'docs', 'pkg', 'pkg.nspkg', 'pkg.subpkg', 'pkg.subpkg.assets']
         self._assert_packages(packages, expected)
 
-    @py3_only
     def test_regular_package_with_nested_pep420_ns_packages(self):
         self._touch('__init__.py', self.pkg_dir)
         packages = find_namespace_packages(
             self.dist_dir, exclude=['docs', 'pkg.subpkg.assets'])
         self._assert_packages(packages, ['pkg', 'pkg.nspkg', 'pkg.subpkg'])
 
-    @py3_only
     def test_pep420_ns_package_no_non_package_dirs(self):
         shutil.rmtree(self.docs_dir)
         shutil.rmtree(os.path.join(self.dist_dir, 'pkg/subpkg/assets'))
diff --git a/setuptools/tests/test_integration.py b/setuptools/tests/test_integration.py
index f1a27f8b..24cef480 100644
--- a/setuptools/tests/test_integration.py
+++ b/setuptools/tests/test_integration.py
@@ -11,8 +11,8 @@ import subprocess
 import functools
 import tarfile
 import zipfile
+import urllib.request
 
-from setuptools.extern.six.moves import urllib
 import pytest
 
 from setuptools.command.easy_install import easy_install
diff --git a/setuptools/tests/test_manifest.py b/setuptools/tests/test_manifest.py
index 2a0e9c86..82bdb9c6 100644
--- a/setuptools/tests/test_manifest.py
+++ b/setuptools/tests/test_manifest.py
@@ -7,19 +7,16 @@ import shutil
 import sys
 import tempfile
 import itertools
+import io
 from distutils import log
 from distutils.errors import DistutilsTemplateError
 
-import pkg_resources.py31compat
 from setuptools.command.egg_info import FileList, egg_info, translate_pattern
 from setuptools.dist import Distribution
-from setuptools.extern import six
 from setuptools.tests.textwrap import DALS
 
 import pytest
 
-__metaclass__ = type
-
 
 def make_local_path(s):
     """Converts '/' in a string to os.sep"""
@@ -42,7 +39,7 @@ setup(**%r)
 @contextlib.contextmanager
 def quiet():
     old_stdout, old_stderr = sys.stdout, sys.stderr
-    sys.stdout, sys.stderr = six.StringIO(), six.StringIO()
+    sys.stdout, sys.stderr = io.StringIO(), io.StringIO()
     try:
         yield
     finally:
@@ -364,7 +361,7 @@ class TestFileListTest(TempDirTestCase):
         for file in files:
             file = os.path.join(self.temp_dir, file)
             dirname, basename = os.path.split(file)
-            pkg_resources.py31compat.makedirs(dirname, exist_ok=True)
+            os.makedirs(dirname, exist_ok=True)
             open(file, 'w').close()
 
     def test_process_template_line(self):
diff --git a/setuptools/tests/test_msvc14.py b/setuptools/tests/test_msvc14.py
index 7833aab4..1aca12dd 100644
--- a/setuptools/tests/test_msvc14.py
+++ b/setuptools/tests/test_msvc14.py
@@ -31,8 +31,6 @@ class TestMSVC14:
         finally:
             _msvccompiler._msvc14_find_vcvarsall = old_find_vcvarsall
 
-    @pytest.mark.skipif(sys.version_info[0] < 3,
-                        reason="Unicode requires encode/decode on Python 2")
     def test_get_vc_env_unicode(self):
         import setuptools.msvc as _msvccompiler
 
diff --git a/setuptools/tests/test_namespaces.py b/setuptools/tests/test_namespaces.py
index f937d981..6c8c522d 100644
--- a/setuptools/tests/test_namespaces.py
+++ b/setuptools/tests/test_namespaces.py
@@ -1,5 +1,3 @@
-from __future__ import absolute_import, unicode_literals
-
 import sys
 import subprocess
 
diff --git a/setuptools/tests/test_packageindex.py b/setuptools/tests/test_packageindex.py
index 29aace13..8e9435ef 100644
--- a/setuptools/tests/test_packageindex.py
+++ b/setuptools/tests/test_packageindex.py
@@ -1,12 +1,11 @@
-from __future__ import absolute_import
-
 import sys
 import os
 import distutils.errors
 import platform
+import urllib.request
+import urllib.error
+import http.client
 
-from setuptools.extern import six
-from setuptools.extern.six.moves import urllib, http_client
 import mock
 import pytest
 
@@ -60,7 +59,7 @@ class TestPackageIndex:
         )
 
         def _urlopen(*args):
-            raise http_client.BadStatusLine('line')
+            raise http.client.BadStatusLine('line')
 
         index.opener = _urlopen
         url = 'http://example.com'
@@ -84,7 +83,7 @@ class TestPackageIndex:
         try:
             index.open_url(url)
         except distutils.errors.DistutilsError as error:
-            msg = six.text_type(error)
+            msg = str(error)
             assert (
                 'nonnumeric port' in msg
                 or 'getaddrinfo failed' in msg
diff --git a/setuptools/tests/test_sdist.py b/setuptools/tests/test_sdist.py
index 0bea53df..049fdcc0 100644
--- a/setuptools/tests/test_sdist.py
+++ b/setuptools/tests/test_sdist.py
@@ -1,8 +1,5 @@
-# -*- coding: utf-8 -*-
 """sdist tests"""
 
-from __future__ import print_function, unicode_literals
-
 import os
 import sys
 import tempfile
@@ -10,9 +7,6 @@ import unicodedata
 import contextlib
 import io
 
-from setuptools.extern import six
-from setuptools.extern.six.moves import map
-
 import pytest
 
 import pkg_resources
@@ -21,7 +15,6 @@ from setuptools.command.egg_info import manifest_maker
 from setuptools.dist import Distribution
 from setuptools.tests import fail_on_ascii
 from .text import Filenames
-from . import py3_only
 
 
 SETUP_ATTRS = {
@@ -42,7 +35,7 @@ setup(**%r)
 @contextlib.contextmanager
 def quiet():
     old_stdout, old_stderr = sys.stdout, sys.stderr
-    sys.stdout, sys.stderr = six.StringIO(), six.StringIO()
+    sys.stdout, sys.stderr = io.StringIO(), io.StringIO()
     try:
         yield
     finally:
@@ -51,7 +44,7 @@ def quiet():
 
 # Convert to POSIX path
 def posix(path):
-    if not six.PY2 and not isinstance(path, str):
+    if not isinstance(path, str):
         return path.replace(os.sep.encode('ascii'), b'/')
     else:
         return path.replace(os.sep, '/')
@@ -59,7 +52,7 @@ def posix(path):
 
 # HFS Plus uses decomposed UTF-8
 def decompose(path):
-    if isinstance(path, six.text_type):
+    if isinstance(path, str):
         return unicodedata.normalize('NFD', path)
     try:
         path = path.decode('utf-8')
@@ -231,7 +224,6 @@ class TestSdistTest:
         # The manifest should contain the UTF-8 filename
         assert posix(filename) in u_contents
 
-    @py3_only
     @fail_on_ascii
     def test_write_manifest_allows_utf8_filenames(self):
         # Test for #303.
@@ -265,7 +257,6 @@ class TestSdistTest:
         # The filelist should have been updated as well
         assert u_filename in mm.filelist.files
 
-    @py3_only
     def test_write_manifest_skips_non_utf8_filenames(self):
         """
         Files that cannot be encoded to UTF-8 (specifically, those that
@@ -329,11 +320,9 @@ class TestSdistTest:
             cmd.read_manifest()
 
         # The filelist should contain the UTF-8 filename
-        if not six.PY2:
-            filename = filename.decode('utf-8')
+        filename = filename.decode('utf-8')
         assert filename in cmd.filelist.files
 
-    @py3_only
     @fail_on_latin1_encoded_filenames
     def test_read_manifest_skips_non_utf8_filenames(self):
         # Test for #303.
@@ -383,21 +372,18 @@ class TestSdistTest:
         if sys.platform == 'darwin':
             filename = decompose(filename)
 
-        if not six.PY2:
-            fs_enc = sys.getfilesystemencoding()
+        fs_enc = sys.getfilesystemencoding()
 
-            if sys.platform == 'win32':
-                if fs_enc == 'cp1252':
-                    # Python 3 mangles the UTF-8 filename
-                    filename = filename.decode('cp1252')
-                    assert filename in cmd.filelist.files
-                else:
-                    filename = filename.decode('mbcs')
-                    assert filename in cmd.filelist.files
+        if sys.platform == 'win32':
+            if fs_enc == 'cp1252':
+                # Python mangles the UTF-8 filename
+                filename = filename.decode('cp1252')
+                assert filename in cmd.filelist.files
             else:
-                filename = filename.decode('utf-8')
+                filename = filename.decode('mbcs')
                 assert filename in cmd.filelist.files
         else:
+            filename = filename.decode('utf-8')
             assert filename in cmd.filelist.files
 
     @classmethod
@@ -425,33 +411,20 @@ class TestSdistTest:
         with quiet():
             cmd.run()
 
-        if six.PY2:
-            # Under Python 2 there seems to be no decoded string in the
-            # filelist.  However, due to decode and encoding of the
-            # file name to get utf-8 Manifest the latin1 maybe excluded
-            try:
-                # fs_enc should match how one is expect the decoding to
-                # be proformed for the manifest output.
-                fs_enc = sys.getfilesystemencoding()
-                filename.decode(fs_enc)
-                assert filename in cmd.filelist.files
-            except UnicodeDecodeError:
-                filename not in cmd.filelist.files
-        else:
-            # not all windows systems have a default FS encoding of cp1252
-            if sys.platform == 'win32':
-                # Latin-1 is similar to Windows-1252 however
-                # on mbcs filesys it is not in latin-1 encoding
-                fs_enc = sys.getfilesystemencoding()
-                if fs_enc != 'mbcs':
-                    fs_enc = 'latin-1'
-                filename = filename.decode(fs_enc)
+        # not all windows systems have a default FS encoding of cp1252
+        if sys.platform == 'win32':
+            # Latin-1 is similar to Windows-1252 however
+            # on mbcs filesys it is not in latin-1 encoding
+            fs_enc = sys.getfilesystemencoding()
+            if fs_enc != 'mbcs':
+                fs_enc = 'latin-1'
+            filename = filename.decode(fs_enc)
 
-                assert filename in cmd.filelist.files
-            else:
-                # The Latin-1 filename should have been skipped
-                filename = filename.decode('latin-1')
-                filename not in cmd.filelist.files
+            assert filename in cmd.filelist.files
+        else:
+            # The Latin-1 filename should have been skipped
+            filename = filename.decode('latin-1')
+            filename not in cmd.filelist.files
 
     def test_pyproject_toml_in_sdist(self, tmpdir):
         """
diff --git a/setuptools/tests/test_setopt.py b/setuptools/tests/test_setopt.py
index 1b038954..0163f9af 100644
--- a/setuptools/tests/test_setopt.py
+++ b/setuptools/tests/test_setopt.py
@@ -1,13 +1,7 @@
-# coding: utf-8
-
-from __future__ import unicode_literals
-
 import io
-
-import six
+import configparser
 
 from setuptools.command import setopt
-from setuptools.extern.six.moves import configparser
 
 
 class TestEdit:
@@ -15,7 +9,7 @@ class TestEdit:
     def parse_config(filename):
         parser = configparser.ConfigParser()
         with io.open(filename, encoding='utf-8') as reader:
-            (parser.readfp if six.PY2 else parser.read_file)(reader)
+            parser.read_file(reader)
         return parser
 
     @staticmethod
diff --git a/setuptools/tests/test_setuptools.py b/setuptools/tests/test_setuptools.py
index 08d263ae..42f8e18b 100644
--- a/setuptools/tests/test_setuptools.py
+++ b/setuptools/tests/test_setuptools.py
@@ -15,7 +15,6 @@ import setuptools
 import setuptools.dist
 import setuptools.depends as dep
 from setuptools.depends import Require
-from setuptools.extern import six
 
 
 def makeSetup(**args):
@@ -49,7 +48,7 @@ class TestDepends:
             x = "test"
             y = z
 
-        fc = six.get_function_code(f1)
+        fc = f1.__code__
 
         # unrecognized name
         assert dep.extract_constant(fc, 'q', -1) is None
diff --git a/setuptools/tests/test_test.py b/setuptools/tests/test_test.py
index 892fd120..180562e2 100644
--- a/setuptools/tests/test_test.py
+++ b/setuptools/tests/test_test.py
@@ -1,7 +1,3 @@
-# -*- coding: utf-8 -*-
-
-from __future__ import unicode_literals
-
 import mock
 from distutils import log
 import os
@@ -110,7 +106,6 @@ def test_tests_are_run_once(capfd):
     with open('dummy/test_dummy.py', 'wt') as f:
         f.write(DALS(
             """
-            from __future__ import print_function
             import unittest
             class TestTest(unittest.TestCase):
                 def test_test(self):
diff --git a/setuptools/tests/test_virtualenv.py b/setuptools/tests/test_virtualenv.py
index 555273ae..b555ce4f 100644
--- a/setuptools/tests/test_virtualenv.py
+++ b/setuptools/tests/test_virtualenv.py
@@ -13,17 +13,6 @@ from .test_easy_install import make_nspkg_sdist
 
 
 @pytest.fixture(autouse=True)
-def disable_requires_python(monkeypatch):
-    """
-    Disable Requires-Python on Python 2.7
-    """
-    if sys.version_info > (3,):
-        return
-
-    monkeypatch.setenv('PIP_IGNORE_REQUIRES_PYTHON', 'true')
-
-
-@pytest.fixture(autouse=True)
 def pytest_virtualenv_works(virtualenv):
     """
     pytest_virtualenv may not work. if it doesn't, skip these
diff --git a/setuptools/tests/test_wheel.py b/setuptools/tests/test_wheel.py
index f72ccbbf..e56eac14 100644
--- a/setuptools/tests/test_wheel.py
+++ b/setuptools/tests/test_wheel.py
@@ -25,8 +25,6 @@ from .contexts import tempdir
 from .files import build_files
 from .textwrap import DALS
 
-__metaclass__ = type
-
 
 WHEEL_INFO_TESTS = (
     ('invalid.whl', ValueError),
diff --git a/setuptools/tests/test_windows_wrappers.py b/setuptools/tests/test_windows_wrappers.py
index 2553394a..fa647de8 100644
--- a/setuptools/tests/test_windows_wrappers.py
+++ b/setuptools/tests/test_windows_wrappers.py
@@ -12,8 +12,6 @@ the script they are to wrap and with the same name as the script they
 are to wrap.
 """
 
-from __future__ import absolute_import
-
 import sys
 import textwrap
 import subprocess
diff --git a/setuptools/tests/text.py b/setuptools/tests/text.py
index ad2c6249..e05cc633 100644
--- a/setuptools/tests/text.py
+++ b/setuptools/tests/text.py
@@ -1,8 +1,3 @@
-# -*- coding: utf-8 -*-
-
-from __future__ import unicode_literals
-
-
 class Filenames:
     unicode = 'smörbröd.py'
     latin_1 = unicode.encode('latin-1')
diff --git a/setuptools/tests/textwrap.py b/setuptools/tests/textwrap.py
index 5cd9e5bc..5e39618d 100644
--- a/setuptools/tests/textwrap.py
+++ b/setuptools/tests/textwrap.py
@@ -1,5 +1,3 @@
-from __future__ import absolute_import
-
 import textwrap