unit test for error when creating room with self

backend/src/schema/resolvers/rooms.spec.ts

@@ -92,6 +92,21 @@ describe('Room', () => {
         })
       })
 
+      describe('user id is self', () => {
+        it('throws error', async () => {
+          await expect(
+            mutate({
+              mutation: createRoomMutation(),
+              variables: {
+                userId: 'chatting-user',
+              },
+            }),
+          ).resolves.toMatchObject({
+            errors: [{ message: 'Cannot create a room with self' }],
+          })
+        })
+      })
+
       describe('user id exists', () => {
         it('returns the id of the room', async () => {
           const result = await mutate({

backend/src/schema/resolvers/rooms.ts

@@ -33,7 +33,7 @@ export default {
         user: { id: currentUserId },
       } = context
       if (userId === currentUserId) {
-        throw new Error('Cannot create a room with yourself')
+        throw new Error('Cannot create a room with self')
       }
       const session = context.driver.session()
       const writeTxResultPromise = session.writeTransaction(async (transaction) => {