Update test

Author: Fokko

tests/integration/test_catalog.py

@@ -689,19 +689,19 @@ def test_namespace_with_slash(test_catalog: Catalog) -> None:
 
     namespace = ("new/db",)
 
-    if test_catalog.namespace_exists(namespace):
+    if namespace in test_catalog.list_namespaces():
         test_catalog.drop_namespace(namespace)
 
-    assert not test_catalog.namespace_exists(namespace)
+    assert namespace not in test_catalog.list_namespaces()
 
     test_catalog.create_namespace(namespace)
-    assert test_catalog.namespace_exists(namespace)
+    assert namespace in test_catalog.list_namespaces()
 
     properties = test_catalog.load_namespace_properties(namespace)
     assert properties is not None
 
     test_catalog.drop_namespace(namespace)
-    assert not test_catalog.namespace_exists(namespace)
+    assert namespace not in test_catalog.list_namespaces()
 
 
 @pytest.mark.integration