ruby on rails - how to correctly use stub for testing in rspec -

so, have method in class follow:

def installation_backlog   api::dashboards::installationsbacklog.new(operational_district_id, officer_id).backlog_tasks end 

and want spec it. so, wrote rspec test test follow:

it "should call new instance of installationsbacklog backlog_tasks method"   expect_any_instance_of(api::dashboards::installationsbacklog).to receive(:backlog_tasks)   @installation_officer.installation_backlog # @installation_officer new instance of container class. end 

and working.

however, began wonder if correct way of doing it. like: sure if stub wrong ( inexistent ) method, , test it, pass or fail?

i tried it, passed

so, if later, method name gets changed, there no way test detect that.

so, here question: how can sure rspec stubbed method existent in code?

here's how i'd set up. might help..

let(:backlog) {   double('backlog', backlog_tasks: []) }  before   allow(api::dashboards::installationsbacklog).to receive(:new).     and_return(backlog) end  'instantiates installationbacklog'   expect(api::dashboards::installationbacklog).to receive(:new).     with(operational_district_id, officer_id)    @installation_officer.installation_backlog end  'calls backlog_tasks on instance of installationbacklog'   expect(backlog).to receive(:backlog_tasks)    @installation_officer.installation_backlog end