spec/unit/mutant/runner/failed_predicte_spec.rb in mutant-0.3.0.beta13 vs spec/unit/mutant/runner/failed_predicte_spec.rb in mutant-0.3.0.beta14

@@ -3,10 +3,10 @@
 describe Mutant::Runner, '#failed?' do
   subject { object.failed? }
 
   let(:object) { class_under_test.run(config) }
 
-  let(:config) { mock('Config') }
+  let(:config) { double('Config') }
   let(:class_under_test) do
     success = self.success
 
     Class.new(described_class) do
       define_method :success? do