silence CLI output during tests

this was 'dirtying' the test output unnecessarily

spec/test_helper.rb

@@ -3,4 +3,19 @@
 require 'ripper'
 require 'fakefs/spec_helpers'
 
+# silence CLI output
+RSpec.configure do |config|
+  original_stderr = $stderr
+  original_stdout = $stdout
+  config.before(:all) do
+    # Redirect stderr and stdout
+    $stderr = File.open(File::NULL, "w")
+    $stdout = File.open(File::NULL, "w")
+  end
+  config.after(:all) do
+    $stderr = original_stderr
+    $stdout = original_stdout
+  end
+end
+
 Dir["#{Dir.pwd}/spec/support/**/*.rb"].each { |f| require f }