Verify job posts to global thread pool

Author: hfenton

spec/concurrent/future_spec.rb

@@ -85,8 +85,9 @@ def get_ivar_from_args(opts)
         Future.execute(executor: executor){ nil }
       end
 
-      it 'uses the global io executor by default', buggy: true do
-        expect(Concurrent).to receive(:global_io_executor).and_return(executor)
+      it 'uses the global io executor by default' do
+        allow(Concurrent).to receive(:global_io_executor).and_return(executor)
+        expect(executor).to receive(:post).and_call_original
         Future.execute{ nil }
       end
     end