Add explicit mutator for blockarg

lib/mutant.rb

@@ -61,6 +61,7 @@ module Mutant
 require 'mutant/mutator/node/literal/nil'
 require 'mutant/mutator/node/argument'
 require 'mutant/mutator/node/arguments'
+require 'mutant/mutator/node/blockarg'
 require 'mutant/mutator/node/begin'
 require 'mutant/mutator/node/connective/binary'
 require 'mutant/mutator/node/const'

lib/mutant/mutator/node/blockarg.rb

@@ -0,0 +1,15 @@
+# encoding: utf-8
+
+module Mutant
+  class Mutator
+    class Node
+
+      # Blockarg mutator
+      class Blockarg < Generic
+
+        handle(:blockarg)
+
+      end # Blockarg
+    end # Node
+  end # Mutator
+end # Mutant

lib/mutant/mutator/node/generic.rb

@@ -12,7 +12,6 @@ class Generic < self
         handle(
           :next, :break, :ensure,
           :yield, :rescue, :redo, :defined?,
-          :blockarg,
           :regopt, :resbody, :retry, :arg_expr,
           :kwrestarg, :kwoptarg, :kwarg, :undef, :module, :empty,
           :alias, :for, :xstr, :back_ref, :class,

spec/unit/mutant/mutator/node/blockarg/mutation_spec.rb

@@ -0,0 +1,17 @@
+# encoding: utf-8
+
+require 'spec_helper'
+
+describe Mutant::Mutator::Node::Blockarg, 'blockarg' do
+  let(:source)  { 'foo { |&bar| }' }
+
+  let(:mutations) do
+    mutations = []
+    mutations << 'foo { |&bar| raise }'
+    mutations << 'foo {}'
+    mutations << 'foo'
+    mutations << 'nil'
+  end
+
+  it_should_behave_like 'a mutator'
+end