diff --git a/koku/api/settings/test/cost_groups/test_query_handler.py b/koku/api/settings/test/cost_groups/test_query_handler.py
index a4e5b8807b..35207338f4 100644
--- a/koku/api/settings/test/cost_groups/test_query_handler.py
+++ b/koku/api/settings/test/cost_groups/test_query_handler.py
@@ -61,7 +61,7 @@ def test_get_cost_groups_invalid(self):
 
     def test_get_cost_groups_filters(self):
         """Basic test to exercise the API endpoint"""
-        parameters = [{"group": "Platform"}, {"default": True}, {"project": OCP_PLATFORM_NAMESPACE}]
+        parameters = ({"group": "Platform"}, {"default": True}, {"project": OCP_PLATFORM_NAMESPACE})
         for parameter in parameters:
             with self.subTest(parameter=parameter):
                 for filter_option, filter_value in parameter.items():
@@ -73,6 +73,31 @@ def test_get_cost_groups_filters(self):
                     for item in data:
                         self.assertEqual(item.get(filter_option), filter_value)
 
+    def test_get_cost_groups_filters_multiple(self):
+        """Test filtering with multiple values per field"""
+
+        test_matrix = (
+            {"field": "group", "value": ["Platform"], "expected": {"Platform"}},
+            {
+                "field": "project",
+                "value": [OCP_PLATFORM_NAMESPACE, "-PrOd"],
+                "expected": {"openshift-default", "koku-prod"},
+            },
+        )
+        for case in test_matrix:
+            with self.subTest(parameter=case["value"]):
+                params = {f"filter[{case['field']}]": case["value"]}
+                with schema_context(self.schema_name):
+                    response = self.client.get(self.url, params, headers=self.headers)
+
+                data = response.data.get("data")
+                result = {}
+                if data:
+                    result = {item[case["field"]] for item in data}
+
+                self.assertEqual(response.status_code, status.HTTP_200_OK)
+                self.assertTrue(result.issubset(case["expected"]))
+
     def test_get_cost_groups_order(self):
         """Basic test to exercise the API endpoint"""