fetch-on-rest/src/__tests__/rest.mocks-tests.js

A REST API wrapper around window.fetch

jest.mock('../rest.js')

describe('Unit tests of mock components', function() {
  var api;

  var throwError = function(resp) {
    throw new Error(`Got unexpected response: ${resp}`)
  };

  beforeEach(function() {
    var Rest = require('../rest.js');
    api = Rest()
  });

  afterEach(function() {
    expect(api.getPending().length).toEqual(0);
  })

  it('should return correct getPending', function() {
    api.setResponse('/users', JSON.stringify({foo: 'bar'}));
    expect(api.getPending().length).toEqual(1);
    return api.get('users').then(resp => {
      expect(resp).toEqual({foo: 'bar'});
    });
  });

  it('should raise error on unexpected calls', function() {
    return api.get('hi').then(throwError, err => {
      expect(err.message).toEqual('Call to /hi without expected response');
    });
  });

  it('should raise error on expected calls with params', function() {
    return api.get(['hi'], {foo: 'bar'}).then(throwError, err => {
      var message = 'Call to /hi?foo=bar without expected response';
      expect(err.message).toEqual(message);
    });
  });

  it('should parse json', function() {
    api.setResponse('/users/me?foo=bar', JSON.stringify({foo: 'bar'}));
    return api.get(['users', 'me'], {foo: 'bar'}).then(resp => {
      expect(resp).toEqual({foo: 'bar'});
    });
  });

  it('should raise error on parse json', function() {
    api.setResponse('/users/me?foo=bar', "some text");
    return api.get(['users', 'me'], {foo: 'bar'}).then(throwError, err => {
      expect(err.message).toEqual('Given setResponse is not JSON.');
    });
  });

  it('should parse text', function() {
    api.setResponse('/foo', 'bar');
    return api.rawGet('foo').then(resp => {
      expect(resp).toBe('bar');
    });
  });

  it('should check the headers passed to fetch', function () {
    api.setResponse('/me', 'bar');
    return api.rawGet('me').then(resp => {
      expect(resp).toBe('bar');
      expect(fetch).toBeCalledWith(
        '/me',
        { headers: {}, method: 'get' }
      );
    });
  });

});