diff --git a/tests/test_metadata_api.py b/tests/test_metadata_api.py
index 94afd95..3dd52e4 100644
--- a/tests/test_metadata_api.py
+++ b/tests/test_metadata_api.py
@@ -335,6 +335,10 @@ def test_get_full_bib_None_oclcNumber_passed(self, stub_session):
         with pytest.raises(InvalidOclcNumber):
             stub_session.get_full_bib(oclcNumber=None)
 
+    @pytest.mark.http_code(200)
+    def test_get_institution_holding_codes(self, stub_session, mock_session_response):
+        assert stub_session.get_institution_holding_codes().status_code == 200
+
     @pytest.mark.http_code(200)
     def test_get_institution_holdings(self, stub_session, mock_session_response):
         assert stub_session.get_institution_holdings("12345")[0].status_code == 200