ember.js - Unit test a controller action that makes calls to async relationships -

i have 2 models, program , project. program has many projects.

app.program = ds.model.extend   projects: ds.hasmany 'project', async: true  app.project = ds.model.extend   program: ds.belongsto 'program' 

i have arraycontroller responsible displaying projects in program. each project rendered has destroy link (a simple action on arraycontroller).

app.projectsindexcontroller = ember.arraycontroller.extend   needs: 'program'   program: ember.computed.alias 'controllers.program.model'    actions:     destroy: (project) ->       @get('program.projects').then (projects) ->         projects.removeobject(project) # how can test line?       @get('program').save()       project.destroyrecord() 

since relationships async, calling program.get('projects') returns promise.

i'm using firebase (and emberfire) backend, stores relationships like

programs: {   programid: {     projects: {       projectid: true     }   } } projects: {   program: 'programid' } 

i'm using ember-qunit , sinon stub/mock library. first attempt @ testing makes heavy use of sinon.spy().

modulefor 'controller:projects.index', 'unit - controller - projects index',   needs: ['controller:program']  test 'actions - destroy', ->   ctrl = @subject()   programctrl = ctrl.get('controllers.program')   project1 = em.object.create(title: 'project #1', destroyrecord: sinon.spy())   project2 = em.object.create(title: 'project #2', destroyrecord: sinon.spy())   projects = em.object.create(removeobject: sinon.spy())   program = em.object.create     title: 'program #1'     projects:       then: sinon.stub().yields(projects)     save: sinon.spy()    ember.run ->     programctrl.set 'model', program     ctrl.send 'destroy', project1     ok(program.projects.then.calledonce, 'removes project program')     ok(program.save.calledonce, 'saves program')     ok(project1.destroyrecord.calledonce, 'destroys project') 

i'm creating new ember objects, since there no clear way me instantiate instance of models in tests (at least know about). every function gets called in action uses sinon.spy() can make assertions did in fact called.

coming rails background seems lot of test code 4 relatively simple lines of coffeescript, leads me believe might going wrong way.

either way, overall question this:

how can test (using sinon, or other way) removeobject() in fact called on program.projects in async callback function?

also, there easier way me stub models without creating new ember objects in every test, in such way can make assertions above?