Added a mocked test case for --no-index passing to pip install.

tests/unit/modules/pip_test.py

@@ -355,6 +355,16 @@ class PipTestCase(TestCase):
                 cwd=None
             )
 
+    def test_no_index_argument_in_resulting_command(self):
+        mock = MagicMock(return_value={'retcode': 0, 'stdout': ''})
+        with patch.dict(pip.__salt__, {'cmd.run_all': mock}):
+            pip.install('pep8', no_index=True)
+            mock.assert_called_once_with(
+                'pip install --no-index pep8',
+                runas=None,
+                cwd=None
+            )
+
 if __name__ == '__main__':
     from integration import run_tests
     run_tests(PipTestCase, needs_daemon=False)