add second test for false condition

test/resolvers/QueryResolverTests.test.ts

@@ -134,7 +134,24 @@ describe("QueryResolvers", () => {
     });
 
     it("returns false if the notification isn't scheduled", async () => {
+      // Act
+      const response = await holder.testServer.executeOperation({
+        query,
+        variables: {
+          input: {
+            shuttleId: "1",
+            stopId: "1",
+            deviceId: "1",
+          },
+        }
+      }, {
+        contextValue: context,
+      });
 
+      // Assert
+      assert(response.body.kind === "single");
+      expect(response.body.singleResult.errors).toBeUndefined();
+      expect(response.body.singleResult.data?.isNotificationScheduled).toBe(false);
     });
   });
 });