selftests: Add additional stdout/stderr checks

More checks to make sure we are not outputting errors to
the wrong loggers.
Signed-off-by: NLucas Meneghel Rodrigues <lmr@redhat.com>

selftests/all/functional/avocado/basic_tests.py

@@ -170,12 +170,14 @@ class RunnerOperationTest(unittest.TestCase):
         expected_rc = 2
         self.assertEqual(result.exit_status, expected_rc)
         self.assertIn('File not found', result.stderr)
+        self.assertNotIn('File not found', result.stdout)
 
     def test_invalid_unique_id(self):
         cmd_line = './scripts/avocado run --sysinfo=off --force-job-id foobar skiptest'
         result = process.run(cmd_line, ignore_status=True)
         self.assertNotEqual(0, result.exit_status)
         self.assertIn('needs to be a 40 digit hex', result.stderr)
+        self.assertNotIn('needs to be a 40 digit hex', result.stdout)
 
     def test_valid_unique_id(self):
         cmd_line = './scripts/avocado run --sysinfo=off --force-job-id 975de258ac05ce5e490648dec4753657b7ccc7d1 skiptest'

selftests/all/functional/avocado/loader_tests.py

@@ -78,6 +78,7 @@ class LoaderTestFunctional(unittest.TestCase):
                          "Avocado did not return rc %d:\n%s" %
                          (expected_rc, result))
         self.assertIn('is not an avocado test', result.stderr)
+        self.assertNotIn('is not an avocado test', result.stdout)
         simple_test.remove()
 
     def test_pass(self):