selftests: Run the whole test workflow for SimpleTests

The advanced features of SimpleTests require logging to be enabled,
which is not part of the `test` method, but the full `run_avocado`
workflow. The fact that it passed is that the advanced features were
broken for quite a long time. This patch uses the `run_avocado` which
contains the `_start_logging` and `_stop_logging` methods needed for the
advanced features to work.
Signed-off-by: NLukáš Doktor <ldoktor@redhat.com>

selftests/unit/test_loader.py

@@ -154,7 +154,7 @@ class LoaderTest(unittest.TestCase):
         test_parameters['name'] = test.TestName(0, test_parameters['name'])
         test_parameters['base_logdir'] = self.tmpdir
         tc = test_class(**test_parameters)
-        tc.test()
+        tc.run_avocado()
         # Load with params
         simple_with_params = simple_test.path + " 'foo bar' --baz"
         suite = self.loader.discover(simple_with_params, True)
@@ -227,7 +227,7 @@ class LoaderTest(unittest.TestCase):
         test_parameters['name'] = test.TestName(0, test_parameters['name'])
         test_parameters['base_logdir'] = self.tmpdir
         tc = test_class(**test_parameters)
-        tc.test()
+        tc.run_avocado()
         avocado_simple_test.remove()
 
     def test_py_simple_test_notexec(self):