Add Mutant::Mutator::Node::LocalVariable

lib/mutant.rb

@@ -58,6 +58,7 @@ require 'mutant/mutator/node/assignment'
 require 'mutant/mutator/node/argument'
 require 'mutant/mutator/node/arguments'
 require 'mutant/mutator/node/begin'
+require 'mutant/mutator/node/lvar'
 require 'mutant/mutator/node/while'
 require 'mutant/mutator/node/super'
 require 'mutant/mutator/node/send'

lib/mutant/mutator/node/generic.rb

@@ -13,7 +13,7 @@ module Mutant
           :zsuper, :not, :or, :and, :defined,
           :next, :break, :match, :gvar, :cvar, :ensure,
           :dstr, :dsym, :yield, :rescue, :redo, :defined?,
-          :lvar, :const, :blockarg, :block_pass, :op_asgn, :and_asgn,
+          :const, :blockarg, :block_pass, :op_asgn, :and_asgn,
           :regopt, :ivar, :restarg, :casgn, :resbody, :retry, :arg_expr,
           :kwrestarg, :kwoptarg, :kwarg, :undef, :module, :cbase, :empty,
           :alias, :for, :xstr, :back_ref, :nth_ref, :class,

lib/mutant/mutator/node/lvar.rb

@@ -0,0 +1,25 @@
+module Mutant
+  class Mutator
+    class Node
+
+      # Mutation emitter to handle local variable nodes
+      class LocalVariable < self
+
+        handle(:lvar)
+
+      private
+
+        # Emit mutations
+        #
+        # @return [undefined]
+        #
+        # @api private
+        #
+        def dispatch
+          emit_nil
+        end
+
+      end # LocalVariable
+    end # Node
+  end # Mutator
+end # Mutant

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

@@ -0,0 +1,21 @@
+require 'spec_helper'
+
+describe Mutant::Mutator, 'lvar' do
+
+  before do
+    Mutant::Random.stub(:hex_string => 'random')
+  end
+
+  let(:source) { 'a = nil; a' }
+
+  let(:mutations) do
+    mutants = []
+    mutants << 'a = nil; nil'
+    mutants << 'a = nil'
+    mutants << 'a'
+    mutants << 'a = ::Object.new; a'
+    mutants << 'srandom = nil; a'
+  end
+
+  it_should_behave_like 'a mutator'
+end