session.js

    import icAjax from 'ic-ajax';
    // ...
    authenticate: function() {
        var request = icAjax(this.get('createSessionUrl'), {
          method: 'POST',
          dataType: 'json',
          data: JSON.stringify(data),
          contentType: 'application/json'
        });
    
        var session = this;
        return new Ember.RSVP.Promise(function(resolve, reject) {
          request.then(function(userData){
            session.save(userData);
            session.setPrefilter();
            resolve(userData);
          }, function(err){
            console.log('Authentication error: ', err);
            reject(err);
          });
        });
    }
  
  
  // test
  session.authenticate('example@example.com', 'password').then(function() {}, function() {
    // If I don't wrap the ic-ajax request in RSVP.Promise, it will always resolve successfully
    // when I chain something on to it, even though internally it's rejected.
    // (I see the console log on LN18)
    // 
    // When I wrap it, this test passes
    ok('Promise rejected')
    start();
  });