logActivity Jasmine test

logActivity.js

describe('logActivity server method', function() {
  it('saves an activity document to the posts collection', function() {
    // Get the testuser document.
    testUser = Meteor.users.findOne( { 'profile.userName': 'testuser' } );
    // Mock Meteor.userId().
    spyOn(Meteor, 'userId').and.returnValue(testUser._id);
    // Mock inserts for activity.
    spyOn(Activity, 'insert');

    type = 'post';
    sourceId = '45B7E9XDWgm9ZKXdv';

    Meteor.call('logActivity', type, sourceId);
    expect(Activity.insert).toHaveBeenCalledWith({
      type: 'post',
      sourceId: '45B7E9XDWgm9ZKXdv',
      userId: testUser._id,
      timestamp: new Date()
    });
  });
});