From 72b7488809632a923c63cc4958b260052595fc94 Mon Sep 17 00:00:00 2001
From: Dan Kubb <dan.kubb@gmail.com>
Date: Mon, 22 Jul 2013 00:33:54 -0700
Subject: [PATCH] Add Mutant::Mutator::Node::LocalVariable

---
 lib/mutant.rb                                 |  1 +
 lib/mutant/mutator/node/generic.rb            |  2 +-
 lib/mutant/mutator/node/lvar.rb               | 25 +++++++++++++++++++
 .../mutant/mutator/node/lvar/mutation_spec.rb | 21 ++++++++++++++++
 4 files changed, 48 insertions(+), 1 deletion(-)
 create mode 100644 lib/mutant/mutator/node/lvar.rb
 create mode 100644 spec/unit/mutant/mutator/node/lvar/mutation_spec.rb

diff --git a/lib/mutant.rb b/lib/mutant.rb
index 6e70cc1b..e8f7dbd0 100644
--- a/lib/mutant.rb
+++ b/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'
diff --git a/lib/mutant/mutator/node/generic.rb b/lib/mutant/mutator/node/generic.rb
index 1bea61e1..7bb82aa7 100644
--- a/lib/mutant/mutator/node/generic.rb
+++ b/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,
diff --git a/lib/mutant/mutator/node/lvar.rb b/lib/mutant/mutator/node/lvar.rb
new file mode 100644
index 00000000..c67aa824
--- /dev/null
+++ b/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
diff --git a/spec/unit/mutant/mutator/node/lvar/mutation_spec.rb b/spec/unit/mutant/mutator/node/lvar/mutation_spec.rb
new file mode 100644
index 00000000..e63edc8b
--- /dev/null
+++ b/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