smoketest: add shim for every test to re-use common tasts

Currently every smoketest does the setup and destruction of the configsession
on its own durin setUp(). This creates a lot of overhead and one configsession
should be re-used during execution of every smoketest script.

In addiion a test that failed will leaf the system in an unconsistent state.
For this reason before the test is executed we will save the running config
to /tmp and the will re-load the config after the test has passed, always
ensuring a clean environment for the next test.

1 files changed, 7 insertions, 6 deletions

diff --git a/smoketest/scripts/cli/test_interfaces_loopback.py b/smoketest/scripts/cli/test_interfaces_loopback.py
index 77dd4c1b5..85b5ca6d6 100755
--- a/smoketest/scripts/cli/test_interfaces_loopback.py
+++ b/smoketest/scripts/cli/test_interfaces_loopback.py
@@ -23,16 +23,17 @@ from vyos.validate import is_intf_addr_assigned
 
 loopbacks = ['127.0.0.1', '::1']
 
-class LoopbackInterfaceTest(BasicInterfaceTest.BaseTest):
+class LoopbackInterfaceTest(BasicInterfaceTest.TestCase):
     @classmethod
     def setUpClass(cls):
-         cls._base_path = ['interfaces', 'loopback']
-         cls._interfaces = ['lo']
+        cls._base_path = ['interfaces', 'loopback']
+        cls._interfaces = ['lo']
+        # call base-classes classmethod
+        super(cls, cls).setUpClass()
 
     def tearDown(self):
-        self.session.delete(self._base_path)
-        self.session.commit()
-        del self.session
+        self.cli_delete(self._base_path)
+        self.cli_commit()
 
         # loopback interface must persist!
         for intf in self._interfaces: