resolvers.test.js

import resolvers from '../src/resolvers';

describe('XKCD resolvers', () => {
  it('returns valid resolvers', () => {
    expect(Object.keys(resolvers)).toEqual(['Query', 'XKCD_Comic']);
  });

  describe('queryResolvers', () => {
    const mockContext = {
      model: {
        // Mock a response so we can actually test it.
        getLatestComic: () => Promise.resolve('latest'),
        // For testing, we mock the model to simply return the ID.
        getComicById: id => Promise.resolve(id),
      },
    };

    describe('getLatestComic()', () => {
      it('loads the latest comic', () => {
        expect.assertions(1);

        return expect(
          resolvers.Query.getLatestComic(null, null, mockContext),
        ).resolves.toEqual('latest');
      });
    });

    describe('getComicById()', () => {
      it('loads a comic by its ID', () => {
        expect.assertions(1);

        return expect(
          resolvers.Query.getComicById(null, { id: 1234 }, mockContext),
        ).resolves.toEqual(1234);
      });
    });
  });

  describe('dataResolvers', () => {
    describe('XKCD_Comic', () => {
      const resolver = resolvers.XKCD_Comic;

      it('creates a link if none is provided', () => {
        expect(resolver.link({ num: 1234 })).toEqual('https://xkcd.com/1234/');
      });
    });
  });
});