Merge branch 'unify-destroy_service_spec.rb' into 'master'

Use expect_next_instance_of to replace expect_any_instance_of

See merge request gitlab-org/gitlab-ce!20072

spec/services/users/destroy_service_spec.rb

@@ -19,7 +19,9 @@ describe Users::DestroyService do
       end
 
       it 'will delete the project' do
-        expect_any_instance_of(Projects::DestroyService).to receive(:execute).once
+        expect_next_instance_of(Projects::DestroyService) do |destroy_service|
+          expect(destroy_service).to receive(:execute).once
+        end
 
         service.execute(user)
       end
@@ -32,7 +34,9 @@ describe Users::DestroyService do
       end
 
       it 'destroys a project in pending_delete' do
-        expect_any_instance_of(Projects::DestroyService).to receive(:execute).once
+        expect_next_instance_of(Projects::DestroyService) do |destroy_service|
+          expect(destroy_service).to receive(:execute).once
+        end
 
         service.execute(user)