diff --git a/test/resolvers/MutationResolverTests.test.ts b/test/resolvers/MutationResolverTests.test.ts
index 9e8b887..f7342fd 100644
--- a/test/resolvers/MutationResolverTests.test.ts
+++ b/test/resolvers/MutationResolverTests.test.ts
@@ -41,6 +41,8 @@ describe("MutationResolvers", () => {
         variables: {
           input: notificationInput,
         }
+      }, {
+        contextValue: context,
       });
 
       assert(response.body.kind === "single");
@@ -52,7 +54,26 @@ describe("MutationResolvers", () => {
     });
 
     it("fails if the shuttle ID doesn't exist", async () => {
+      const system = await addMockSystemToRepository(context.repository);
+      const stop = await addMockStopToRepository(context.repository, system.id);
 
+      const notificationInput = {
+        deviceId: "1",
+        shuttleId: "1",
+        stopId: stop.id,
+      }
+      const response = await holder.testServer.executeOperation({
+        query,
+        variables: {
+          input: notificationInput,
+        }
+      }, {
+        contextValue: context
+      });
+
+      assert(response.body.kind === "single");
+      expect(response.body.singleResult.errors).toBeUndefined();
+      expect(response.body.singleResult.data?.success).toBe(false);
     });
 
     it("fails if the stop ID doesn't exist", async () => {