better test coverage for not equals version spec

tests/samples/requirements-with-multiline.txt

@@ -1,2 +1,4 @@
 afakepackage == 0.9, < 3.0, \
-  < 2.0, <= 1.0
+  > 0.1, >= 0.2, < 2.0, <= 1.0, != 0.9.1
+afakepackage == 0.9, < 3.0, \
+  < 2.0, <= 1.0, != 0.9.1\

tests/samples/results/test_updates_package_with_multiline_spec

@@ -1,2 +1,4 @@
 afakepackage == 1.0, < 3.0, \
-  < 2.0, <= 1.0
+  > 0.1, >= 0.2, < 2.0, <= 1.0, != 0.9.1
+afakepackage == 1.0, < 3.0, \
+  < 2.0, <= 1.0, != 0.9.1\

tests/test_pur.py

@@ -347,6 +347,28 @@ def test_max_version_spec_prevents_updating_package(self):
             expected_requirements = open(tmpfile).read()
             self.assertEquals(open(tmpfile).read(), expected_requirements)
 
+    def test_notequal_version_spec_prevents_updating_package(self):
+        requirements = 'tests/samples/requirements-with-multiline.txt'
+        tempdir = tempfile.mkdtemp()
+        tmpfile = os.path.join(tempdir, 'requirements.txt')
+        shutil.copy(requirements, tmpfile)
+        args = ['-r', tmpfile]
+
+        with utils.mock.patch('pip.index.PackageFinder.find_all_candidates') as mock_find_all_candidates:
+            project = 'afakepackage'
+            version = '0.9.1'
+            link = Link('')
+            candidate = InstallationCandidate(project, version, link)
+            mock_find_all_candidates.return_value = [candidate]
+
+            result = self.runner.invoke(pur, args)
+            self.assertIsNone(result.exception)
+            expected_output = "All requirements up-to-date.\n"
+            self.assertEquals(u(result.output), u(expected_output))
+            self.assertEquals(result.exit_code, 0)
+            expected_requirements = open(tmpfile).read()
+            self.assertEquals(open(tmpfile).read(), expected_requirements)
+
     def test_updates_package_with_multiline_spec(self):
         requirements = 'tests/samples/requirements-with-multiline.txt'
         tempdir = tempfile.mkdtemp()
@@ -363,7 +385,7 @@ def test_updates_package_with_multiline_spec(self):
 
             result = self.runner.invoke(pur, args)
             self.assertIsNone(result.exception)
-            expected_output = "Updated afakepackage: 0.9 -> 1.0\nAll requirements up-to-date.\n"
+            expected_output = "Updated afakepackage: 0.9 -> 1.0\nUpdated afakepackage: 0.9 -> 1.0\nAll requirements up-to-date.\n"
             self.assertEquals(u(result.output), u(expected_output))
             self.assertEquals(result.exit_code, 0)
             expected_requirements = open('tests/samples/results/test_updates_package_with_multiline_spec').read()