getNews.spec.ts

import { contentfulDeliveryClient } from './contentful';

import getNews from './getNews';

jest.mock('./flattenAssetFields', () => ({
  flattenImageAssetFields: jest.fn((item) => item),
}));

jest.mock('./contentful', () => ({
  contentfulDeliveryClient: {
    getEntries: jest.fn(),
  },
}));

const mockedEntries = {
  title: 'test title',
  slug: 'test-slug',
  date: 'test date',
  category: 'test category',
  keywords: ['test-keyword-1', 'test-keyword-2'],
  content: 'test content',
  description: 'test description',
  image: 'test image',
};

beforeEach(() => {
  (contentfulDeliveryClient.getEntries as jest.Mock)
    .mockImplementation(() => ({ items: [{ fields: mockedEntries }] }));
});

afterEach(() => {
  jest.clearAllMocks();
});

it('Queries news articles', async () => {
  const result = await getNews({ limit: 12 });

  expect(contentfulDeliveryClient.getEntries).toHaveBeenCalledTimes(1);
  expect(contentfulDeliveryClient.getEntries).toHaveBeenNthCalledWith(1, {
    content_type: 'newsArticle',
    order: ['-fields.date'],
    limit: 12,
  });

  expect(result).toStrictEqual([mockedEntries]);
});

it('Queries new articles with no keywords', async () => {
  (contentfulDeliveryClient.getEntries as jest.Mock)
    .mockImplementation(() => ({
      items: [{
        fields: {
          ...mockedEntries,
          keywords: undefined,
        },
      }],
    }));

  const result = await getNews({ limit: 100 });

  expect(result).toStrictEqual([{
    ...mockedEntries,
    keywords: [],
  }]);
});