Update test_isatools_utils.py

Looks like the API changed a little bit, so it's 'ols4' instead of 'ols'. It also returns a '?lang=en' at the end, so I changed it to an assertIn instead of assertEqual. The description is also not empty now. I'm not sure why it was once empty. Perhaps 'efo' wasn't actually being found and now it is? I ran the test with the base 'develop' branch and the description is not empty their either.

tests/utils/test_isatools_utils.py

@@ -82,12 +82,13 @@ def test_get_ontology(self):
         ontology_source = ols.get_ols_ontology('efo')
         self.assertIsInstance(ontology_source, OntologySource)
         self.assertEqual(ontology_source.name, 'efo')
-        self.assertEqual(
-            ontology_source.file,
-            'https://www.ebi.ac.uk/ols/api/ontologies/efo')
+        self.assertIn(
+            'https://www.ebi.ac.uk/ols4/api/ontologies/efo',
+            ontology_source.file
+            )
         self.assertIsInstance(ontology_source.version, str)
         self.assertEqual(
-            ontology_source.description, '')
+            ontology_source.description, 'Experimental Factor Ontology')
 
     def test_search_for_term(self):
         ontology_source = ols.get_ols_ontology('efo')