testing-with-promises-snippet-1.js

describe('Membership Viewer', function () {
  var membershipViewer, membershipService;
  
  beforeEach(function () {
    membershipService = jasmine.createSpyObj('membershipService', ['getMembers']);
    membershipViewer = new MembershipViewer(membershipService);
  });
  
  it('should display a list of group members', function() {
    var members = ['Alice', 'Bob'];
    membershipService.getMembers.and.returnValue($q.resolve(members));
    
    membershipViewer.showMembers('a-group-id');
    $scope.$apply();
    expect(membershipService.getMembers).toHaveBeenCalledWith('a-group-id');
    expect(membershipViewer.members).toEqual(members);
  });

  it('should dislay an error when unable to retrieve group members', function () {
    var asyncError = "Unknown group id!";
    membershipService.getMembers.and.returnValue($q.reject(asyncError));
  
    membershipViewer.showMembers('unknown-group-id');
    $scope.$apply();
    expect(membershipService.getMembers.toHaveBeenCalledWith('unknown-group-id');
    expect(membershipViewer.error).toEqual(asyncError);
  });
})