Types mismatch: ApolloServer/ApolloServerBase

Following the example of an integration test:

https://github.com/apollographql/fullstack-tutorial/blob/6988f6948668ccc2dea3f7a216dd44bdf25a0b9f/final/server/src/__tests__/__utils.js#L25-L30

https://github.com/apollographql/fullstack-tutorial/blob/6988f6948668ccc2dea3f7a216dd44bdf25a0b9f/final/server/src/__tests__/integration.js#L87

Environment

• apollo-server-express@2.8.1
• apollo-server-testing@2.9.2
• typescript@3.5.3

The issue

The output type of new ApolloServer is ApolloServer, while the input type to createTestClient is ApolloServerBase. This makes these functions not compatible.

I’m using TypeScript, therefore I can experience this error.

Expected behavior

a) createTestClient(server: ApolloServer) b) Change the example of creating a server instance to return expected ApolloServerBase.

[HurricaneJames]

I just had the same issue. In my case upgrading both apollo-server and apollo-server-testing to 2.9.13 fixed the problem. I think the solution is just to make sure the apollo-server, or apollo-server-express, version is in sync with apollo-server-testing.

[kettanaito]

I confirm that updating to the following versions of packages fixed the issue for me:

{
  "apollo-server-express": "2.9.13",
  "apollo-server-testing": "2.9.13
}