TimerTask spec: avoid RSpec warning

olleolleolle · olleolleolle · commit 47dd5b4f1370 · 2017-12-09T00:41:46.000+01:00
diff --git a/spec/concurrent/timer_task_spec.rb b/spec/concurrent/timer_task_spec.rb
@@ -129,7 +129,7 @@ def trigger_observable(observable)
       it 'raises an exception if no block given' do
         expect {
           Concurrent::TimerTask.execute
-        }.to raise_error
+        }.to raise_error(ArgumentError)
       end
 
       specify '#execution_interval is writeable' do
