Define create_snapshot() and clean() in TestCase

They replace the former calls in run_tests which are not suitable for all
test cases. Now any test case can define how to clean its resources.

If the snapshot cannot be created, the test case is considered as
failed. Only a message is printed if any failure during cleaning.

It also defines a new class called OSGCTestCase useful for test cases
which don't clean their OpenStack resources.
All test cases located in opnfv_tests/openstack inherit from it to
keep the global behavior unchanged.

It also deletes exit instructions in openstack_clean and
openstack_snapshot, removes clean flags in testcases.yaml and updates
the related utils.

All Docs are modified as well.

JIRA: FUNCTEST-438

Change-Id: I8938e6255708012380389763a24059ace4ce45d8
Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

15 files changed, 148 insertions, 100 deletions

diff --git a/functest/ci/run_tests.py b/functest/ci/run_tests.py
index 8317df54..9e64196e 100755
--- a/functest/ci/run_tests.py
+++ b/functest/ci/run_tests.py
@@ -22,8 +22,6 @@ import prettytable
 import functest.ci.tier_builder as tb
 import functest.core.testcase as testcase
 import functest.utils.functest_utils as ft_utils
-import functest.utils.openstack_clean as os_clean
-import functest.utils.openstack_snapshot as os_snapshot
 import functest.utils.openstack_utils as os_utils
 from functest.utils.constants import CONST
 
@@ -98,14 +96,6 @@ class Runner(object):
                     CONST.__setattr__('OS_PASSWORD', value)
 
     @staticmethod
-    def generate_os_snapshot():
-        os_snapshot.main()
-
-    @staticmethod
-    def cleanup():
-        os_clean.main()
-
-    @staticmethod
     def get_run_dict(testname):
         try:
             dict = ft_utils.get_dict_by_test(testname)
@@ -124,14 +114,11 @@ class Runner(object):
                 "The test case {} is not enabled".format(test.get_name()))
         logger.info("\n")  # blank line
         self.print_separator("=")
-        logger.info("Running test case '%s'..." % test.get_name())
+        logger.info("Running test case '%s'...", test.get_name())
         self.print_separator("=")
         logger.debug("\n%s" % test)
         self.source_rc_file()
 
-        if test.needs_clean() and self.clean_flag:
-            self.generate_os_snapshot()
-
         flags = " -t %s" % test.get_name()
         if self.report_flag:
             flags += " -r"
@@ -145,6 +132,9 @@ class Runner(object):
                 test_dict = ft_utils.get_dict_by_test(test.get_name())
                 test_case = cls(**test_dict)
                 self.executed_test_cases.append(test_case)
+                if self.clean_flag:
+                    if test_case.create_snapshot() != test_case.EX_OK:
+                        return result
                 try:
                     kwargs = run_dict['args']
                     result = test_case.run(**kwargs)
@@ -155,6 +145,8 @@ class Runner(object):
                         test_case.push_to_db()
                     result = test_case.is_successful()
                 logger.info("Test result:\n\n%s\n", test_case)
+                if self.clean_flag:
+                    test_case.clean()
             except ImportError:
                 logger.exception("Cannot import module {}".format(
                     run_dict['module']))
@@ -164,15 +156,7 @@ class Runner(object):
         else:
             raise Exception("Cannot import the class for the test case.")
 
-        if test.needs_clean() and self.clean_flag:
-            self.cleanup()
-        if result != testcase.TestCase.EX_OK:
-            logger.error("The test case '%s' failed. " % test.get_name())
-            self.overall_result = Result.EX_ERROR
-            if test.is_blocking():
-                raise BlockingTestFailed(
-                    "The test case {} failed and is blocking".format(
-                        test.get_name()))
+        return result
 
     def run_tier(self, tier):
         tier_name = tier.get_name()
@@ -187,7 +171,14 @@ class Runner(object):
         self.print_separator("#")
         logger.debug("\n%s" % tier)
         for test in tests:
-            self.run_test(test, tier_name)
+            result = self.run_test(test, tier_name)
+            if result != testcase.TestCase.EX_OK:
+                logger.error("The test case '%s' failed.", test.get_name())
+                self.overall_result = Result.EX_ERROR
+                if test.is_blocking():
+                    raise BlockingTestFailed(
+                        "The test case {} failed and is blocking".format(
+                            test.get_name()))
 
     def run_all(self, tiers):
         summary = ""
@@ -225,9 +216,14 @@ class Runner(object):
                 if _tiers.get_tier(kwargs['test']):
                     self.run_tier(_tiers.get_tier(kwargs['test']))
                 elif _tiers.get_test(kwargs['test']):
-                    self.run_test(_tiers.get_test(kwargs['test']),
-                                  _tiers.get_tier_name(kwargs['test']),
-                                  kwargs['test'])
+                    result = self.run_test(
+                        _tiers.get_test(kwargs['test']),
+                        _tiers.get_tier_name(kwargs['test']),
+                        kwargs['test'])
+                    if result != testcase.TestCase.EX_OK:
+                        logger.error("The test case '%s' failed.",
+                                     kwargs['test'])
+                        self.overall_result = Result.EX_ERROR
                 elif kwargs['test'] == "all":
                     self.run_all(_tiers)
                 else:
diff --git a/functest/ci/testcases.yaml b/functest/ci/testcases.yaml
index 8222df10..7d518324 100644
--- a/functest/ci/testcases.yaml
+++ b/functest/ci/testcases.yaml
@@ -12,7 +12,6 @@ tiers:
                 project_name: functest
                 criteria: 100
                 blocking: true
-                clean_flag: false
                 description: >-
                     This test case verifies the retrieval of OpenStack clients:
                     Keystone, Glance, Neutron and Nova and may perform some
@@ -31,7 +30,6 @@ tiers:
                 project_name: functest
                 criteria: 100
                 blocking: true
-                clean_flag: false
                 description: >-
                     This test case verifies the retrieval of OpenStack clients:
                     Keystone, Glance, Neutron and Nova and may perform some
@@ -50,7 +48,6 @@ tiers:
                 project_name: functest
                 criteria: 100
                 blocking: true
-                clean_flag: false
                 description: >-
                     This test case creates executes the SimpleHealthCheck
                     Python test class which creates an, image, flavor, network,
@@ -75,7 +72,6 @@ tiers:
                 project_name: functest
                 criteria: 100
                 blocking: true
-                clean_flag: true
                 description: >-
                     This test case verifies: 1) SSH to an instance using floating
                     IPs over the public network. 2) Connectivity between 2 instances
@@ -92,7 +88,6 @@ tiers:
                 project_name: functest
                 criteria: 100
                 blocking: true
-                clean_flag: true
                 description: >-
                     This test case verifies:  1) Boot a VM with given userdata.
                     2) Connectivity between 2 instances over a private network.
@@ -108,7 +103,6 @@ tiers:
                 project_name: functest
                 criteria: 100
                 blocking: false
-                clean_flag: true
                 description: >-
                     This test case runs the smoke subset of the OpenStack
                     Tempest suite. The list of test cases is generated by
@@ -126,7 +120,6 @@ tiers:
                 project_name: functest
                 criteria: 100
                 blocking: false
-                clean_flag: false
                 description: >-
                     This test case runs a sub group of tests of the OpenStack
                     Rally suite in smoke mode.
@@ -142,7 +135,6 @@ tiers:
                 project_name: functest
                 criteria: 100
                 blocking: false
-                clean_flag: true
                 description: >-
                     This test case runs a sub group of tests of the OpenStack
                     Defcore testcases by using refstack client.
@@ -158,7 +150,6 @@ tiers:
                 project_name: functest
                 criteria: 100
                 blocking: true
-                clean_flag: false
                 description: >-
                     Test Suite for the OpenDaylight SDN Controller. It
                     integrates some test suites from upstream using
@@ -179,7 +170,6 @@ tiers:
                 project_name: functest
                 criteria: 100
                 blocking: false
-                clean_flag: false
                 description: >-
                     Test Suite for the OpenDaylight SDN Controller when
                     the NetVirt features are installed. It integrates
@@ -202,7 +192,6 @@ tiers:
                 project_name: functest
                 criteria: 100
                 blocking: false
-                clean_flag: false
                 description: >-
                     Test Suite for the OpenDaylight SDN Controller when GBP features are
                     installed. It integrates some test suites from upstream using
@@ -222,7 +211,6 @@ tiers:
                 project_name: functest
                 criteria: 100
                 blocking: true
-                clean_flag: true
                 description: >-
                     Test Suite for the ONOS SDN Controller. It integrates
                     some test suites from upstream using TestON as the test
@@ -239,7 +227,6 @@ tiers:
                 project_name: functest
                 criteria: 100
                 blocking: false
-                clean_flag: false
                 description: >-
                     This test case contains tests that setup and destroy
                     environments with VMs with and without Floating IPs
@@ -269,7 +256,6 @@ tiers:
                 project_name: promise
                 criteria: 100
                 blocking: false
-                clean_flag: true
                 description: >-
                     Test suite from Promise project.
                 dependencies:
@@ -287,7 +273,6 @@ tiers:
                 project_name: doctor
                 criteria: 100
                 blocking: false
-                clean_flag: true
                 description: >-
                     Test suite from Doctor project.
                 dependencies:
@@ -304,7 +289,6 @@ tiers:
                 project_name: sdnvpn
                 criteria: 100
                 blocking: false
-                clean_flag: true
                 description: >-
                     Test suite from SDNVPN project.
                 dependencies:
@@ -322,7 +306,6 @@ tiers:
                 project_name: securityscanning
                 criteria: 100
                 blocking: false
-                clean_flag: true
                 description: >-
                     Simple Security Scan
                 dependencies:
@@ -340,7 +323,6 @@ tiers:
                 project_name: copper
                 criteria: 100
                 blocking: false
-                clean_flag: true
                 description: >-
                     Test suite for policy management based on OpenStack Congress
                 dependencies:
@@ -358,7 +340,6 @@ tiers:
                 project_name: multisite
                 criteria: 100
                 blocking: false
-                clean_flag: false
                 description: >-
                     Test suite from kingbird
                 dependencies:
@@ -374,7 +355,6 @@ tiers:
                 project_name: sfc
                 criteria: 100
                 blocking: false
-                clean_flag: true
                 description: >-
                     Test suite for odl-sfc to test two chains and two SFs
                 dependencies:
@@ -392,7 +372,6 @@ tiers:
                 project_name: functest
                 criteria: 100
                 blocking: true
-                clean_flag: true
                 description: >-
                     Test Suite for onos-sfc to test sfc function.
                 dependencies:
@@ -408,7 +387,6 @@ tiers:
                 project_name: parser
                 criteria: 100
                 blocking: false
-                clean_flag: true
                 description: >-
                     Test suite from Parser project.
                 dependencies:
@@ -426,7 +404,6 @@ tiers:
                 project_name: domino
                 criteria: 100
                 blocking: false
-                clean_flag: true
                 description: >-
                     Test suite from Domino project.
                 dependencies:
@@ -444,7 +421,6 @@ tiers:
                 project_name: netready
                 criteria: 100
                 blocking: false
-                clean_flag: true
                 description: >-
                     Test suite from Netready project.
                 dependencies:
@@ -462,7 +438,6 @@ tiers:
                 project_name: barometer
                 criteria: 100
                 blocking: false
-                clean_flag: true
                 description: >-
                     Test suite for the Barometer project. Separate tests verify the
                     proper configuration and functionality of the following
@@ -487,7 +462,6 @@ tiers:
                 project_name: functest
                 criteria: 80
                 blocking: false
-                clean_flag: true
                 description: >-
                     The list of test cases is generated by
                     Tempest automatically and depends on the parameters of
@@ -504,7 +478,6 @@ tiers:
                 project_name: functest
                 criteria: 100
                 blocking: false
-                clean_flag: true
                 description: >-
                     The test case allows running a customized list of tempest
                     test cases defined in a file under
@@ -523,7 +496,6 @@ tiers:
                 project_name: functest
                 criteria: 90
                 blocking: false
-                clean_flag: false
                 description: >-
                     This test case runs the full suite of scenarios of the OpenStack
                     Rally suite using several threads and iterations.
@@ -546,7 +518,6 @@ tiers:
                 project_name: functest
                 criteria: 100
                 blocking: false
-                clean_flag: true
                 description: >-
                     This test case deploys an OpenSource vIMS solution from Clearwater
                     using the Cloudify orchestrator. It also runs some signaling traffic.
@@ -563,7 +534,6 @@ tiers:
                 project_name: functest
                 criteria: 100
                 blocking: false
-                clean_flag: true
                 description: >-
                    Test suite from Parser project.
                 dependencies:
@@ -579,7 +549,6 @@ tiers:
                 project_name: functest
                 criteria: 100
                 blocking: false
-                clean_flag: true
                 description: >-
                     VNF deployment with OpenBaton (Orchestra)
                 dependencies:
@@ -595,7 +564,6 @@ tiers:
                 project_name: opera
                 criteria: 100
                 blocking: false
-                clean_flag: true
                 description: >-
                     VNF deployment with OPEN-O
                 dependencies:
@@ -611,7 +579,6 @@ tiers:
                 project_name: functest
                 criteria: 100
                 blocking: false
-                clean_flag: true
                 description: >-
                     This test case is vRouter testing.
                 dependencies:
diff --git a/functest/ci/tier_builder.py b/functest/ci/tier_builder.py
index d03cd903..f8038468 100644
--- a/functest/ci/tier_builder.py
+++ b/functest/ci/tier_builder.py
@@ -52,7 +52,6 @@ class TierBuilder(object):
                                        dependency=dep,
                                        criteria=dic_testcase['criteria'],
                                        blocking=dic_testcase['blocking'],
-                                       clean_flag=dic_testcase['clean_flag'],
                                        description=dic_testcase['description'])
                 if (testcase.is_compatible(self.ci_installer,
                                            self.ci_scenario) and
diff --git a/functest/ci/tier_handler.py b/functest/ci/tier_handler.py
index 36ce245e..4f2f14ec 100644
--- a/functest/ci/tier_handler.py
+++ b/functest/ci/tier_handler.py
@@ -109,14 +109,12 @@ class TestCase(object):
                  dependency,
                  criteria,
                  blocking,
-                 clean_flag,
                  description=""):
         self.name = name
         self.enabled = enabled
         self.dependency = dependency
         self.criteria = criteria
         self.blocking = blocking
-        self.clean_flag = clean_flag
         self.description = description
 
     @staticmethod
@@ -149,9 +147,6 @@ class TestCase(object):
     def is_blocking(self):
         return self.blocking
 
-    def needs_clean(self):
-        return self.clean_flag
-
     def __str__(self):
         lines = split_text(self.description, LINE_LENGTH - 6)
 
diff --git a/functest/core/testcase.py b/functest/core/testcase.py
index 43161525..50ca2ce4 100644
--- a/functest/core/testcase.py
+++ b/functest/core/testcase.py
@@ -15,6 +15,8 @@ import os
 import prettytable
 
 import functest.utils.functest_utils as ft_utils
+import functest.utils.openstack_clean as os_clean
+import functest.utils.openstack_snapshot as os_snapshot
 
 __author__ = "Cedric Ollivier <cedric.ollivier@orange.com>"
 
@@ -176,3 +178,51 @@ class TestCase(object):
         except Exception:  # pylint: disable=broad-except
             self.__logger.exception("The results cannot be pushed to DB")
             return TestCase.EX_PUSH_TO_DB_ERROR
+
+    def create_snapshot(self):  # pylint: disable=no-self-use
+        """Save the testing environement before running test.
+
+        It can be overriden if resources must be listed running the
+        test case.
+
+        Returns:
+            TestCase.EX_OK
+        """
+        return TestCase.EX_OK
+
+    def clean(self):
+        """Clean the resources.
+
+        It can be overriden if resources must be deleted after
+        running the test case.
+        """
+
+
+class OSGCTestCase(TestCase):
+    """Model for single test case which requires an OpenStack Garbage
+    Collector."""
+
+    __logger = logging.getLogger(__name__)
+
+    def create_snapshot(self):
+        """Create a snapshot listing the OpenStack resources.
+
+        Returns:
+            TestCase.EX_OK if os_snapshot.main() returns 0.
+            TestCase.EX_RUN_ERROR otherwise.
+        """
+        try:
+            assert os_snapshot.main() == 0
+            self.__logger.info("OpenStack resources snapshot created")
+            return TestCase.EX_OK
+        except Exception:  # pylint: disable=broad-except
+            self.__logger.exception("Cannot create the snapshot")
+            return TestCase.EX_RUN_ERROR
+
+    def clean(self):
+        """Clean the OpenStack resources."""
+        try:
+            assert os_clean.main() == 0
+            self.__logger.info("OpenStack resources cleaned")
+        except Exception:  # pylint: disable=broad-except
+            self.__logger.exception("Cannot clean the OpenStack resources")
diff --git a/functest/opnfv_tests/openstack/rally/rally.py b/functest/opnfv_tests/openstack/rally/rally.py
index 86ec3558..97e2444a 100644
--- a/functest/opnfv_tests/openstack/rally/rally.py
+++ b/functest/opnfv_tests/openstack/rally/rally.py
@@ -27,7 +27,7 @@ import functest.utils.openstack_utils as os_utils
 logger = logging.getLogger(__name__)
 
 
-class RallyBase(testcase.TestCase):
+class RallyBase(testcase.OSGCTestCase):
     TESTS = ['authenticate', 'glance', 'cinder', 'heat', 'keystone',
              'neutron', 'nova', 'quotas', 'requests', 'vm', 'all']
     GLANCE_IMAGE_NAME = CONST.__getattribute__('openstack_image_name')
diff --git a/functest/opnfv_tests/openstack/refstack_client/refstack_client.py b/functest/opnfv_tests/openstack/refstack_client/refstack_client.py
index 5f1f3a1d..b2a21533 100755
--- a/functest/opnfv_tests/openstack/refstack_client/refstack_client.py
+++ b/functest/opnfv_tests/openstack/refstack_client/refstack_client.py
@@ -27,7 +27,7 @@ from tempest_conf import TempestConf
 logger = logging.getLogger(__name__)
 
 
-class RefstackClient(testcase.TestCase):
+class RefstackClient(testcase.OSGCTestCase):
 
     def __init__(self, **kwargs):
         if "case_name" not in kwargs:
diff --git a/functest/opnfv_tests/openstack/tempest/tempest.py b/functest/opnfv_tests/openstack/tempest/tempest.py
index f5f194e6..99425af5 100644
--- a/functest/opnfv_tests/openstack/tempest/tempest.py
+++ b/functest/opnfv_tests/openstack/tempest/tempest.py
@@ -28,7 +28,7 @@ import functest.utils.functest_utils as ft_utils
 logger = logging.getLogger(__name__)
 
 
-class TempestCommon(testcase.TestCase):
+class TempestCommon(testcase.OSGCTestCase):
 
     def __init__(self, **kwargs):
         super(TempestCommon, self).__init__(**kwargs)
diff --git a/functest/opnfv_tests/openstack/vping/vping_base.py b/functest/opnfv_tests/openstack/vping/vping_base.py
index 8e71bf82..099f26b7 100644
--- a/functest/opnfv_tests/openstack/vping/vping_base.py
+++ b/functest/opnfv_tests/openstack/vping/vping_base.py
@@ -13,7 +13,7 @@ import os
 import time
 import uuid
 
-from functest.core.testcase import TestCase
+from functest.core import testcase
 from functest.utils import functest_utils
 from functest.utils.constants import CONST
 
@@ -24,7 +24,7 @@ from snaps.openstack.tests import openstack_tests
 from snaps.openstack.utils import deploy_utils, nova_utils
 
 
-class VPingBase(TestCase):
+class VPingBase(testcase.OSGCTestCase):
 
     """
     Base class for vPing tests that check connectivity between two VMs shared
@@ -152,12 +152,12 @@ class VPingBase(TestCase):
         else:
             raise Exception('VMs never became active')
 
-        if result == TestCase.EX_RUN_ERROR:
-            return TestCase.EX_RUN_ERROR
+        if result == testcase.TestCase.EX_RUN_ERROR:
+            return testcase.TestCase.EX_RUN_ERROR
 
         self.stop_time = time.time()
         self.result = 100
-        return TestCase.EX_OK
+        return testcase.TestCase.EX_OK
 
     def _cleanup(self):
         """
diff --git a/functest/tests/unit/ci/test_run_tests.py b/functest/tests/unit/ci/test_run_tests.py
index 88e5d2b8..fb8cb391 100644
--- a/functest/tests/unit/ci/test_run_tests.py
+++ b/functest/tests/unit/ci/test_run_tests.py
@@ -38,8 +38,12 @@ class RunTestsTesting(unittest.TestCase):
                       'OS_PASSWORD': 'test_password'}
         self.test = {'test_name': 'test_name'}
         self.tier = mock.Mock()
+        test1 = mock.Mock()
+        test1.get_name.return_value = 'test1'
+        test2 = mock.Mock()
+        test2.get_name.return_value = 'test2'
         attrs = {'get_name.return_value': 'test_tier',
-                 'get_tests.return_value': ['test1', 'test2'],
+                 'get_tests.return_value': [test1, test2],
                  'get_ci_loop.return_value': 'test_ci_loop',
                  'get_test_names.return_value': ['test1', 'test2']}
         self.tier.configure_mock(**attrs)
@@ -70,16 +74,6 @@ class RunTestsTesting(unittest.TestCase):
                         return_value=self.creds):
             self.runner.source_rc_file()
 
-    @mock.patch('functest.ci.run_tests.os_snapshot.main')
-    def test_generate_os_snapshot(self, mock_os_snap):
-        self.runner.generate_os_snapshot()
-        self.assertTrue(mock_os_snap.called)
-
-    @mock.patch('functest.ci.run_tests.os_clean.main')
-    def test_cleanup(self, mock_os_clean):
-        self.runner.cleanup()
-        self.assertTrue(mock_os_clean.called)
-
     def test_get_run_dict_if_defined_default(self):
         mock_obj = mock.Mock()
         with mock.patch('functest.ci.run_tests.'
@@ -137,8 +131,6 @@ class RunTestsTesting(unittest.TestCase):
 
     @mock.patch('functest.ci.run_tests.Runner.print_separator')
     @mock.patch('functest.ci.run_tests.Runner.source_rc_file')
-    @mock.patch('functest.ci.run_tests.Runner.generate_os_snapshot')
-    @mock.patch('functest.ci.run_tests.Runner.cleanup')
     @mock.patch('importlib.import_module', name="module",
                 return_value=mock.Mock(test_class=mock.Mock(
                     side_effect=FakeModule)))
@@ -161,10 +153,10 @@ class RunTestsTesting(unittest.TestCase):
     def test_run_tier_default(self, mock_logger_info):
         with mock.patch('functest.ci.run_tests.Runner.print_separator'), \
                 mock.patch(
-                    'functest.ci.run_tests.Runner.run_test') as mock_method:
+                    'functest.ci.run_tests.Runner.run_test',
+                    return_value=TestCase.EX_OK) as mock_method:
             self.runner.run_tier(self.tier)
-            mock_method.assert_any_call('test1', 'test_tier')
-            mock_method.assert_any_call('test2', 'test_tier')
+            mock_method.assert_any_call(mock.ANY, 'test_tier')
             self.assertTrue(mock_logger_info.called)
 
     @mock.patch('functest.ci.run_tests.logger.info')
@@ -237,7 +229,8 @@ class RunTestsTesting(unittest.TestCase):
         with mock.patch('functest.ci.run_tests.tb.TierBuilder',
                         return_value=mock_obj), \
             mock.patch('functest.ci.run_tests.Runner.source_rc_file'), \
-                mock.patch('functest.ci.run_tests.Runner.run_test') as m:
+                mock.patch('functest.ci.run_tests.Runner.run_test',
+                           return_value=TestCase.EX_OK) as m:
             self.assertEqual(self.runner.main(**kwargs),
                              run_tests.Result.EX_OK)
             self.assertTrue(m.called)
diff --git a/functest/tests/unit/ci/test_tier_builder.py b/functest/tests/unit/ci/test_tier_builder.py
index 989c0870..ab75e15b 100644
--- a/functest/tests/unit/ci/test_tier_builder.py
+++ b/functest/tests/unit/ci/test_tier_builder.py
@@ -24,7 +24,6 @@ class TierBuilderTesting(unittest.TestCase):
                          'case_name': 'test_name',
                          'criteria': 'test_criteria',
                          'blocking': 'test_blocking',
-                         'clean_flag': 'test_clean_flag',
                          'description': 'test_desc'}
 
         self.dic_tier = {'name': 'test_tier',
diff --git a/functest/tests/unit/ci/test_tier_handler.py b/functest/tests/unit/ci/test_tier_handler.py
index c93fffd3..1909ac22 100644
--- a/functest/tests/unit/ci/test_tier_handler.py
+++ b/functest/tests/unit/ci/test_tier_handler.py
@@ -34,7 +34,6 @@ class TierHandlerTesting(unittest.TestCase):
                                               self.mock_depend,
                                               'test_criteria',
                                               'test_blocking',
-                                              'test_clean_flag',
                                               description='test_desc')
 
         self.dependency = tier_handler.Dependency('test_installer',
diff --git a/functest/tests/unit/core/test_testcase.py b/functest/tests/unit/core/test_testcase.py
index ef0983cc..0a6f0c9f 100644
--- a/functest/tests/unit/core/test_testcase.py
+++ b/functest/tests/unit/core/test_testcase.py
@@ -221,6 +221,55 @@ class TestCaseTesting(unittest.TestCase):
         self.assertIn(duration, message)
         self.assertIn('FAIL', message)
 
+    def test_create_snapshot(self):
+        self.assertEqual(self.test.create_snapshot(),
+                         testcase.TestCase.EX_OK)
+
+    def test_clean(self):
+        self.assertEqual(self.test.clean(), None)
+
+
+class OSGCTestCaseTesting(unittest.TestCase):
+    """The class testing OSGCTestCase."""
+    # pylint: disable=missing-docstring
+
+    def setUp(self):
+        self.test = testcase.OSGCTestCase()
+
+    @mock.patch('functest.utils.openstack_snapshot.main',
+                side_effect=Exception)
+    def test_create_snapshot_exc(self, mock_method=None):
+        self.assertEqual(self.test.create_snapshot(),
+                         testcase.TestCase.EX_RUN_ERROR)
+        mock_method.assert_called_once_with()
+
+    @mock.patch('functest.utils.openstack_snapshot.main', return_value=-1)
+    def test_create_snapshot_ko(self, mock_method=None):
+        self.assertEqual(self.test.create_snapshot(),
+                         testcase.TestCase.EX_RUN_ERROR)
+        mock_method.assert_called_once_with()
+
+    @mock.patch('functest.utils.openstack_snapshot.main', return_value=0)
+    def test_create_snapshot_env(self, mock_method=None):
+        self.assertEqual(self.test.create_snapshot(),
+                         testcase.TestCase.EX_OK)
+        mock_method.assert_called_once_with()
+
+    @mock.patch('functest.utils.openstack_clean.main', side_effect=Exception)
+    def test_clean_exc(self, mock_method=None):
+        self.assertEqual(self.test.clean(), None)
+        mock_method.assert_called_once_with()
+
+    @mock.patch('functest.utils.openstack_clean.main', return_value=-1)
+    def test_clean_ko(self, mock_method=None):
+        self.assertEqual(self.test.clean(), None)
+        mock_method.assert_called_once_with()
+
+    @mock.patch('functest.utils.openstack_clean.main', return_value=0)
+    def test_clean(self, mock_method=None):
+        self.assertEqual(self.test.clean(), None)
+        mock_method.assert_called_once_with()
+
 
 if __name__ == "__main__":
     logging.disable(logging.CRITICAL)
diff --git a/functest/utils/openstack_clean.py b/functest/utils/openstack_clean.py
index 29106d9e..cdd91852 100755
--- a/functest/utils/openstack_clean.py
+++ b/functest/utils/openstack_clean.py
@@ -22,9 +22,9 @@
 # http://www.apache.org/licenses/LICENSE-2.0
 #
 
-import time
-
 import logging
+import sys
+import time
 import yaml
 
 import functest.utils.openstack_utils as os_utils
@@ -392,7 +392,7 @@ def main():
     except Exception:
         logger.info("The file %s does not exist. The OpenStack snapshot must"
                     " be created first. Aborting cleanup." % OS_SNAPSHOT_FILE)
-        exit(0)
+        return 0
 
     default_images = snapshot_yaml.get('images')
     default_instances = snapshot_yaml.get('instances')
@@ -407,7 +407,7 @@ def main():
     if not os_utils.check_credentials():
         logger.error("Please source the openrc credentials and run "
                      "the script again.")
-        exit(-1)
+        return -1
 
     remove_instances(nova_client, default_instances)
     separator()
@@ -429,4 +429,4 @@ def main():
 
 if __name__ == '__main__':
     logging.basicConfig()
-    main()
+    sys.exit(main())
diff --git a/functest/utils/openstack_snapshot.py b/functest/utils/openstack_snapshot.py
index 952fb7bb..8f1d3b9b 100755
--- a/functest/utils/openstack_snapshot.py
+++ b/functest/utils/openstack_snapshot.py
@@ -22,6 +22,7 @@
 
 import logging
 import yaml
+import sys
 
 import functest.utils.openstack_utils as os_utils
 from functest.utils.constants import CONST
@@ -139,7 +140,7 @@ def main():
     if not os_utils.check_credentials():
         logger.error("Please source the openrc credentials and run the" +
                      "script again.")
-        exit(-1)
+        return -1
 
     snapshot = {}
     snapshot.update(get_instances(nova_client))
@@ -163,4 +164,4 @@ def main():
 
 if __name__ == '__main__':
     logging.basicConfig()
-    main()
+    sys.exit(main())