Add mutator for break nodes

lib/mutant.rb

@@ -64,6 +64,7 @@ require 'mutant/mutator/node/argument'
 require 'mutant/mutator/node/arguments'
 require 'mutant/mutator/node/blockarg'
 require 'mutant/mutator/node/begin'
+require 'mutant/mutator/node/break'
 require 'mutant/mutator/node/connective/binary'
 require 'mutant/mutator/node/const'
 require 'mutant/mutator/node/dstr'

lib/mutant/mutator/node/break.rb

@@ -0,0 +1,30 @@
+# encoding: utf-8
+
+module Mutant
+  class Mutator
+    class Node
+
+      # Break mutator
+      class Break < Generic
+
+        handle(:break)
+
+      private
+
+        # Emit mutations
+        #
+        # @return [undefined]
+        #
+        # @api private
+        #
+        def dispatch
+          super
+          children.each_index(&method(:delete_child))
+          emit(s(:next, *children))
+          emit_nil
+        end
+
+      end # Break
+    end # Node
+  end # Mutator
+end # Mutant

lib/mutant/mutator/node/generic.rb

@@ -10,7 +10,7 @@ module Mutant
         # These nodes still need a dedicated mutator,
         # your contribution is that close!
         handle(
-          :next, :break, :ensure,
+          :next, :ensure,
           :rescue, :redo, :defined?,
           :regopt, :resbody, :retry, :arg_expr,
           :kwrestarg, :kwoptarg, :kwarg, :undef, :module, :empty,

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

@@ -2,13 +2,16 @@
 
 require 'spec_helper'
 
-describe Mutant::Mutator::Node::Generic, 'break' do
-  let(:source)    { 'break true' }
+describe Mutant::Mutator::Node::Break, 'break' do
+  let(:source) { 'break true' }
 
   let(:mutations) do
     mutations = []
     mutations << 'break false'
     mutations << 'break nil'
+    mutations << 'break'
+    mutations << 'nil'
+    mutations << 'next true'
   end
 
   it_should_behave_like 'a mutator'