Add conditional loop mutator

* Closes #143
* Renamed Mutator::Node::While to ConditionalLoop and use it to
  generated mutations for until also.

lib/mutant.rb

@@ -76,7 +76,7 @@ require 'mutant/mutator/node/named_value/variable_assignment'
 require 'mutant/mutator/node/loop_control'
 require 'mutant/mutator/node/noop'
 require 'mutant/mutator/node/op_asgn'
-require 'mutant/mutator/node/while'
+require 'mutant/mutator/node/conditional_loop'
 require 'mutant/mutator/node/yield'
 require 'mutant/mutator/node/super'
 require 'mutant/mutator/node/zsuper'

lib/mutant/mutator/node/conditional_loop.rb

@@ -5,9 +5,9 @@ module Mutant
     class Node
 
       # Mutator for while expressions
-      class While < self
+      class ConditionalLoop < self
 
-        handle(:while)
+        handle(:until, :while)
 
         children :condition, :body
 

lib/mutant/mutator/node/generic.rb

@@ -15,7 +15,8 @@ module Mutant
           :regopt, :retry, :arg_expr,
           :kwrestarg, :kwoptarg, :kwarg, :undef, :module, :empty,
           :alias, :for, :xstr, :back_ref, :class,
-          :sclass, :match_with_lvasgn, :match_current_line
+          :sclass, :match_with_lvasgn, :match_current_line, :while_post,
+          :until_post, :preexe, :postexe, :iflipflop, :eflipflop, :kwsplat
         )
 
       private

spec/unit/mutant/mutator/node/conditional_loop_spec.rb

@@ -0,0 +1,42 @@
+# encoding: utf-8
+
+require 'spec_helper'
+
+describe Mutant::Mutator::Node::ConditionalLoop do
+
+  context 'with while statement' do
+    let(:source) { 'while true; foo; bar; end' }
+
+    let(:mutations) do
+      mutations = []
+      mutations << 'while true; bar; end'
+      mutations << 'while true; foo; end'
+      mutations << 'while true; end'
+      mutations << 'while false; foo; bar; end'
+      mutations << 'while nil;   foo; bar; end'
+      mutations << 'while true;  foo; nil; end'
+      mutations << 'while true;  nil; bar; end'
+      mutations << 'nil'
+    end
+
+    it_should_behave_like 'a mutator'
+  end
+
+  context 'with until statement' do
+    let(:source) { 'until true; foo; bar; end' }
+
+    let(:mutations) do
+      mutations = []
+      mutations << 'until true; bar; end'
+      mutations << 'until true; foo; end'
+      mutations << 'until true; end'
+      mutations << 'until false; foo; bar; end'
+      mutations << 'until nil;   foo; bar; end'
+      mutations << 'until true;  foo; nil; end'
+      mutations << 'until true;  nil; bar; end'
+      mutations << 'nil'
+    end
+
+    it_should_behave_like 'a mutator'
+  end
+end

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

@@ -1,24 +0,0 @@
-# encoding: utf-8
-
-require 'spec_helper'
-
-describe Mutant::Mutator::Node::While do
-
-  context 'with more than one statement' do
-    let(:source) { 'while true; foo; bar; end' }
-
-    let(:mutations) do
-      mutations = []
-      mutations << 'while true; bar; end'
-      mutations << 'while true; foo; end'
-      mutations << 'while true; end'
-      mutations << 'while false; foo; bar; end'
-      mutations << 'while nil;   foo; bar; end'
-      mutations << 'while true;  foo; nil; end'
-      mutations << 'while true;  nil; bar; end'
-      mutations << 'nil'
-    end
-
-    it_should_behave_like 'a mutator'
-  end
-end