Add unit tests for setuptools deprecation warnings

These are tests to ensure that the specified deprecation warnings are
raised when the functions are called.
Co-authored-by: Junhan Huang <robin.j.huang@gmail.com>
Co-authored-by: Marton Pono <marci93@gmail.com>

setuptools/tests/test_dist.py

@@ -3,7 +3,7 @@
 from __future__ import unicode_literals
 
 import io
-
+from setuptools.dist import DistDeprecationWarning, _get_unpatched
 from setuptools import Distribution
 from setuptools.extern.six.moves.urllib.request import pathname2url
 from setuptools.extern.six.moves.urllib_parse import urljoin
@@ -56,6 +56,9 @@ def test_dist_fetch_build_egg(tmpdir):
     assert [dist.key for dist in resolved_dists if dist] == reqs
 
 
+def test_dist__get_unpatched_deprecated():
+    pytest.warns(DistDeprecationWarning, _get_unpatched, [""])
+
 def __maintainer_test_cases():
     attrs = {"name": "package",
              "version": "1.0",

setuptools/tests/test_easy_install.py

@@ -15,7 +15,7 @@ import distutils.errors
 import io
 import zipfile
 import mock
-
+from setuptools.command.easy_install import EasyInstallDeprecationWarning, ScriptWriter, WindowsScriptWriter
 import time
 from setuptools.extern import six
 from setuptools.extern.six.moves import urllib
@@ -288,6 +288,22 @@ class TestEasyInstallTest:
         assert (target / 'mypkg_script').exists()
 
 
+    def test_dist_get_script_args_deprecated(self):
+        with pytest.warns(EasyInstallDeprecationWarning):
+            ScriptWriter.get_script_args(None, None)
+
+    def test_dist_get_script_header_deprecated(self):
+        with pytest.warns(EasyInstallDeprecationWarning):
+            ScriptWriter.get_script_header("")
+
+    def test_dist_get_writer_deprecated(self):
+        with pytest.warns(EasyInstallDeprecationWarning):
+            ScriptWriter.get_writer(None)
+
+    def test_dist_WindowsScriptWriter_get_writer_deprecated(self):
+        with pytest.warns(EasyInstallDeprecationWarning):
+            WindowsScriptWriter.get_writer()
+
 @pytest.mark.filterwarnings('ignore:Unbuilt egg')
 class TestPTHFileWriter:
     def test_add_from_cwd_site_sets_dirty(self):

setuptools/tests/test_egg_info.py

@@ -7,7 +7,7 @@ import re
 import stat
 import time
 
-from setuptools.command.egg_info import egg_info, manifest_maker
+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
 
@@ -603,3 +603,6 @@ class TestEggInfo:
         with open(os.path.join(egg_info_dir, 'PKG-INFO')) as pkginfo_file:
             pkg_info_lines = pkginfo_file.read().split('\n')
         assert 'Version: 0.0.0.dev0' in pkg_info_lines
+
+    def test_get_pkg_info_revision_deprecated(self):
+        pytest.warns(EggInfoDeprecationWarning, get_pkg_info_revision)
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