tests: Fix TestMirrorGroup to load oscrc from fixtures

tests/test_grabber.py

@@ -7,12 +7,16 @@
 import osc.grabber as osc_grabber
 
 
+FIXTURES_DIR = os.path.join(os.path.dirname(__file__), "conf_fixtures")
+
+
 class TestMirrorGroup(unittest.TestCase):
     def setUp(self):
         self.tmpdir = tempfile.mkdtemp(prefix='osc_test')
         # reset the global `config` in preparation for running the tests
         importlib.reload(osc.conf)
-        osc.conf.get_config()
+        oscrc = os.path.join(self._get_fixtures_dir(), "oscrc")
+        osc.conf.get_config(override_conffile=oscrc, override_no_keyring=True)
 
     def tearDown(self):
         # reset the global `config` to avoid impacting tests from other classes
@@ -22,6 +26,9 @@ def tearDown(self):
         except:
             pass
 
+    def _get_fixtures_dir(self):
+        return FIXTURES_DIR
+
     def test_invalid_scheme(self):
         gr = osc_grabber.OscFileGrabber()
         mg = osc_grabber.OscMirrorGroup(gr, ["container://example.com"])