Testing tutorial with jest: feedback and questions

[0xsven]

I like turtles! And nexus. I just went through most of the tutorial and am very impressed. The tutorial is great. Only the testing section is problematic for me.

FirstI am going to describe an issue that I solved already, and second another issue I couldn't solve. I would appreciate some help on this. I am also willing to send a PR for the documentation once I got it running.

1. (Solved) Error once I copy-pasted the tutorial code into my project:

This was solved by passing the prisma client aka db into graphqlTestContext.before as described below (look at the lines with the green checkmarks ✅):

export function createTestContext(): TestContext {

  let ctx = {} as TestContext;
  const graphqlCtx = graphqlTestContext();
  const prismaCtx = prismaTestContext();

  beforeEach(async () => {

    const db = await prismaCtx.before();
    const client = await graphqlCtx.before(db); // ✅ Here... 

    Object.assign(ctx, {
      client,
      db,
    });
  });

  afterEach(async () => {
    await graphqlCtx.after();
    await prismaCtx.after();
  });

  return ctx;
}

function graphqlTestContext() {

  let serverInstance: ServerInfo | null = null;

  return {
    async before(db: PrismaClient) {  // ✅ ...and here
      const port = await getPort({ port: makeRange(4000, 6000) });
      serverInstance = await server.listen({ port });
     // Close the Prisma Client connection when the Apollo Server is closed
     serverInstance.server.on("close", async () => {
       db.$disconnect() 
     });
      return new GraphQLClient(`http://localhost:${port}`);
    },
    async after() {
      serverInstance?.server.close();
    },
  };
}

I am actually not sure why we cant just close the db connection in prismaTestContext.after ?

2. Port 4000 already in use.

The tutorial works fine for just one test. Once you add more than one test, those fail with the following error listen EADDRINUSE address already in use :::4000

The tutorial code uses get-port to get an available code. After reading through get-code's github issues I tried the solution described here. Unfortunately without success. Can you give me a hint on how to run this setup with multiple test files and tests.

[dreilacadin]

I have the same question. Anyone who has an insight regarding this?