From 7ccbae8bd4fdb1dd7f47c8d00490da36a6c693f6 Mon Sep 17 00:00:00 2001
From: Markus Schirp <mbj@seonic.net>
Date: Wed, 1 Aug 2012 15:08:29 +0200
Subject: [PATCH] Add match all and match none mutations to regexp

---
 lib/mutant/mutator/literal/regex.rb            | 17 ++++++++++++++++-
 spec/unit/mutant/mutator/literal/regex_spec.rb | 14 ++------------
 2 files changed, 18 insertions(+), 13 deletions(-)

diff --git a/lib/mutant/mutator/literal/regex.rb b/lib/mutant/mutator/literal/regex.rb
index 054715a3..cf674587 100644
--- a/lib/mutant/mutator/literal/regex.rb
+++ b/lib/mutant/mutator/literal/regex.rb
@@ -16,7 +16,22 @@ module Mutant
         #
         def dispatch
           emit_nil
-          emit_new { new_self(Random.hex_string, node.options) }
+          emit_self('') # match all
+          emit_self('a\A') # match nothing
+          emit_new { new_self(Random.hex_string) }
+        end
+
+        # Return new Rubinius::AST::Regex
+        #
+        # @param [String] source
+        #
+        # @param [Integer] options
+        #   options of regexp, defaults to mutation subject node options
+        #
+        # @return [undefined]
+        #
+        def new_self(source,options=nil)
+          super(source,options || node.options)
         end
       end
     end
diff --git a/spec/unit/mutant/mutator/literal/regex_spec.rb b/spec/unit/mutant/mutator/literal/regex_spec.rb
index c2dbbfdc..45fcd038 100644
--- a/spec/unit/mutant/mutator/literal/regex_spec.rb
+++ b/spec/unit/mutant/mutator/literal/regex_spec.rb
@@ -9,6 +9,8 @@ describe Mutant::Mutator::Literal, 'regex' do
     mutations = []
     mutations << 'nil'
     mutations << "/#{random_string}/"
+    mutations << '//' # match all
+    mutations << '/a\A/' # match nothing
   end
 
   before do
@@ -18,16 +20,4 @@ describe Mutant::Mutator::Literal, 'regex' do
   let(:mutations) { base_mutations }
 
   it_should_behave_like 'a mutator'
-
-  context 'when source is empty regexp' do
-    before do
-      pending
-    end
-
-    let(:source) { '//' }
-
-    let(:mutations) { base_mutations - [source.to_ast] }
-
-    it_should_behave_like 'a mutator'
-  end
 end