Finish porting unit tests to Python 3

Port the last unit tests to Python 3, test_test_runner:

* TestCaseShell constructor: don't replace sys.stdout and sys.stderr
  by StringIO, it's useless and prevent using print() to debug
  failing unit tests.
* shell(): use mock.patch() to replace sys.stdout and sys.stderr
* test_version(): on Python 3, the version is written into stdout,
  not stderr.
* test_package_is_not_provided(): the exact error message changes on
  Python 3.

test_migrations:

* Use a byte string for archive and logo BLOBs

Remove whitelist of tests running on Python 3 from tox.ini since all
unit tests now pass on Python 3!

Blueprint: murano-python-3-support
Change-Id: Ic795b99526746ac0c06427001e4da27275b76d84

murano/tests/unit/api/cmd/test_test_runner.py

@@ -41,9 +41,6 @@ class TestCaseShell(testtools.TestCase):
             k = '--os-' + k.replace('_', '-')
             self.args.extend([k, v])
 
-        sys.stdout = six.StringIO()
-        sys.stderr = six.StringIO()
-
         self.useFixture(fixtures.MonkeyPatch('keystoneclient.v3.client.Client',
                                              mock.MagicMock))
         dirs = [os.path.dirname(__file__),
@@ -60,24 +57,20 @@ class TestCaseShell(testtools.TestCase):
         self.addCleanup(CONF.clear_override, name, group)
 
     def shell(self, cmd_args=None, exitcode=0):
-        orig = sys.stdout
+        stdout = six.StringIO()
-        orig_stderr = sys.stderr
+        stderr = six.StringIO()
-        sys.stdout = six.StringIO()
-        sys.stderr = six.StringIO()
         args = self.args
         if cmd_args:
             cmd_args = cmd_args.split()
             args.extend(cmd_args)
+        with mock.patch.object(sys, 'stdout', stdout):
+            with mock.patch.object(sys, 'stderr', stderr):
                 with mock.patch.object(sys, 'argv', args):
                     result = self.assertRaises(SystemExit, test_runner.main)
                     self.assertEqual(result.code, exitcode,
                                      'Command finished with error.')
-        stdout = sys.stdout.getvalue()
+        stdout = stdout.getvalue()
-        sys.stdout.close()
+        stderr = stderr.getvalue()
-        sys.stdout = orig
-        stderr = sys.stderr.getvalue()
-        sys.stderr.close()
-        sys.stderr = orig_stderr
         return (stdout, stderr)
 
     def test_help(self):
@@ -94,8 +87,12 @@ class TestCaseShell(testtools.TestCase):
         self.assertIn(usage, stdout)
 
     def test_version(self):
-        _, stderr = self.shell('--version')
+        stdout, stderr = self.shell('--version')
-        self.assertIn(version.version_string, stderr)
+        if six.PY3:
+            output = stdout
+        else:
+            output = stderr
+        self.assertIn(version.version_string, output)
 
     @mock.patch.object(test_runner, 'LOG')
     def test_increase_verbosity(self, mock_log):
@@ -157,7 +154,11 @@ class TestCaseShell(testtools.TestCase):
 
     def test_package_is_not_provided(self):
         _, stderr = self.shell(exitcode=2)
-        self.assertIn('murano-test-runner: error: too few arguments', stderr)
+        if six.PY3:
+            err = 'the following arguments are required: '
+        else:
+            err = 'too few arguments'
+        self.assertIn('murano-test-runner: error: %s' % err, stderr)
 
     def test_wrong_parent(self):
         _, stderr = self.shell(

murano/tests/unit/db/migration/test_migrations.py

@@ -105,7 +105,7 @@ class MuranoMigrationsCheckers(object):
 
         package = {
             'id': str(uuid.uuid4()),
-            'archive': "archive blob here",
+            'archive': b"archive blob here",
             'fully_qualified_name': 'com.example.package',
             'type': 'class',
             'author': 'OpenStack',
@@ -114,7 +114,7 @@ class MuranoMigrationsCheckers(object):
             'description': 'some text',
             'is_public': False,
             'tags': ['tag1', 'tag2'],
-            'logo': "logo blob here",
+            'logo': b"logo blob here",
             'ui_definition': '{}',
             'owner_id': '123',
             'created': datetime.datetime.now(),

tox.ini

@@ -15,39 +15,6 @@ deps = -r{toxinidir}/requirements.txt
 commands = bash tools/pretty_tox.sh '{posargs}'
 whitelist_externals = bash
 
-[testenv:py34]
-commands = python -m testtools.run \
-    murano/tests/unit/api/middleware/test_ssl.py \
-    murano/tests/unit/api/v1/cloudfoundry/test_cfapi.py \
-    murano/tests/unit/api/v1/test_actions.py \
-    murano/tests/unit/api/v1/test_catalog.py \
-    murano/tests/unit/api/v1/test_env_templates.py \
-    murano/tests/unit/api/v1/test_environments.py \
-    murano/tests/unit/api/v1/test_sessions.py \
-    murano/tests/unit/cmd/test_engine_workers.py \
-    murano/tests/unit/common/helpers/test_token_sanitizer.py \
-    murano/tests/unit/common/test_is_different.py \
-    murano/tests/unit/common/test_plugin_loader.py \
-    murano/tests/unit/common/test_traverse_helper.py \
-    murano/tests/unit/core_library/instance/test_destroy/test_destroy.py \
-    murano/tests/unit/db/services/test_core_service.py \
-    murano/tests/unit/db/services/test_environments.py \
-    murano/tests/unit/db/services/test_templates_service.py \
-    murano/tests/unit/db/test_catalog.py \
-    murano/tests/unit/db/test_models.py \
-    murano/tests/unit/dsl/test_helpers.py \
-    murano/tests/unit/engine/system/test_agent.py \
-    murano/tests/unit/engine/test_package_loader.py \
-    murano/tests/unit/packages/hot_package/test_hot_package.py \
-    murano/tests/unit/packages/versions/test_hot_v1.py \
-    murano/tests/unit/packages/versions/test_mpl_v1.py \
-    murano/tests/unit/policy/test_congress_rules.py \
-    murano/tests/unit/policy/test_model_policy_enforcer.py \
-    murano/tests/unit/test_actions.py \
-    murano/tests/unit/test_engine.py \
-    murano/tests/unit/test_hacking.py \
-    murano/tests/unit/test_heat_stack.py
-
 [testenv:murano-test-runner]
 commands = murano-test-runner {posargs}