Test classes and slots directly, not len

Author: amc-corey-cox

tests/test_importers/test_rdfs_importer.py

@@ -33,9 +33,8 @@ def test_import_foaf():
     engine = RdfsImportEngine()
     schema = engine.convert(FOAF)
     sv = SchemaView(schema)
-    assert sv.all_classes() == ["Person", "Agent", "Document"]
-    assert len(sv.all_classes()) == 3
-    assert len(sv.all_slots()) == 1
+    assert sv.all_classes() == {}
+    assert sv.all_slots() == {}
     assert sv.get_slot("knows").range == "Person"
     assert sv.schema.default_prefix == "foaf"
     assert "foaf" in sv.schema.prefixes