medium-fastify-graphql-integration-test.ts

// src/tests/integration.spec.ts
import * as request from 'supertest';
import {app} from '../index';
import {gql} from 'mercurius-codegen';
describe(`Integration`, () => {
    // 1. Just some small helper to wrap GraphQL success responses in the 'data' property
    const successResponse = (response: object): { data: object } => ({data: response});

    beforeEach(async () => {
        // 2. Wait for our server to become ready to respond to requests
        await app.ready();
    });

    /**
     * 3. GraphQL Query: add(...)
     */
    describe(`Query add(...)`, () => {
        it(`Should return correct response`, async () => {
            // 4. Create Query
            const query = gql`
                query {
                    add (x:5, y: 4)
                }
            `;
            // 5. Create expected success response from server
            const expectedResponse = successResponse({add: 9});

            // 6. Send request to our server
            await request(app.server)
                .post('/graphql')
                .send({
                    query,
                })
                // 7. Check expectation
                .expect(200, expectedResponse);
        });
    });

});