Convert gr-change-status_test to Typescript

Change-Id: Ia497701eca4b2b8c1e5e1561d6bbe90068b93ae6
diff --git a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_test.ts b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_test.ts
index 3d51ac6..5128948 100644
--- a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_test.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_test.ts
@@ -1222,7 +1222,7 @@
       },
     };
     element._mergeable = true;
-    const expectedStatuses = ['Merged', 'WIP'];
+    const expectedStatuses = [ChangeStates.MERGED, ChangeStates.WIP];
     assert.deepEqual(element._changeStatuses, expectedStatuses);
     flush();
     const statusChips = element.shadowRoot!.querySelectorAll(