silence standard output during RSpec runs

spec/lib/generators/testing_framework_adapter_generator_spec.rb

@@ -3,13 +3,15 @@ require 'generators/testing_framework_adapter_generator'
 require 'rails_helper'
 
 describe TestingFrameworkAdapterGenerator do
+  include Silencer
+
   describe '#create_testing_framework_adapter' do
     let(:name) { 'TestUnit' }
     let(:path) { Rails.root.join('lib', "#{name.underscore}_adapter.rb") }
     let(:spec_path) { Rails.root.join('spec', 'lib', "#{name.underscore}_adapter_spec.rb") }
 
     before(:each) do
-      Rails::Generators.invoke('testing_framework_adapter', [name])
+      silenced { Rails::Generators.invoke('testing_framework_adapter', [name]) }
     end
 
     after(:each) do

spec/support/silencer.rb

@@ -0,0 +1,8 @@
+module Silencer
+  def silenced
+    @stdout = $stdout
+    $stdout = File.new(File.join('tmp', 'stdout'), 'w')
+    yield if block_given?
+    $stdout = @stdout
+  end
+end