Remove pytest marker and code for Python < 2.7

setuptools/tests/test_test.py

@@ -93,10 +93,6 @@ def test_test(capfd):
     assert out == 'Foo\n'
 
 
-@pytest.mark.skipif(
-    sys.version_info < (2, 7),
-    reason="No discover support for unittest on Python 2.6",
-)
 @pytest.mark.usefixtures('tmpdir_cwd', 'quiet_log')
 def test_tests_are_run_once(capfd):
     params = dict(

setuptools/tests/test_virtualenv.py

@@ -57,9 +57,6 @@ def test_pip_upgrade_from_source(virtualenv):
     Check pip can upgrade setuptools from source.
     """
     dist_dir = virtualenv.workspace
-    if sys.version_info < (2, 7):
-        # Python 2.6 support was dropped in wheel 0.30.0.
-        virtualenv.run('pip install -U "wheel<0.30.0"')
     # Generate source distribution / wheel.
     virtualenv.run(' && '.join((
         'cd {source}',