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

Prefer `expect_next_instance_of` over `expect_any_instance_of`

See merge request gitlab-org/gitlab-ce!20141

spec/workers/delete_user_worker_spec.rb

@@ -5,15 +5,17 @@ describe DeleteUserWorker do
   let!(:current_user) { create(:user) }
 
   it "calls the DeleteUserWorker with the params it was given" do
-    expect_any_instance_of(Users::DestroyService).to receive(:execute)
-                                                      .with(user, {})
+    expect_next_instance_of(Users::DestroyService) do |service|
+      expect(service).to receive(:execute).with(user, {})
+    end
 
     described_class.new.perform(current_user.id, user.id)
   end
 
   it "uses symbolized keys" do
-    expect_any_instance_of(Users::DestroyService).to receive(:execute)
-                                                      .with(user, test: "test")
+    expect_next_instance_of(Users::DestroyService) do |service|
+      expect(service).to receive(:execute).with(user, test: "test")
+    end
 
     described_class.new.perform(current_user.id, user.id, "test" => "test")
   end