Code order

jupyterlab/tests/test_jupyterlab.py

@@ -117,9 +117,9 @@ class TestExtension(TestCase):
         assert '@jupyterlab/python-tests' in _get_extensions(self.app_dir)
 
     def test_install_twice(self):
-        install_extension(self.source_dir)
         install_extension(self.source_dir)
         path = pjoin(get_app_dir(), 'extensions', '*python-tests*.tgz')
+        install_extension(self.source_dir)
         assert glob.glob(path)
         assert '@jupyterlab/python-tests' in list_extensions()