Add match all and match none mutations to regexp

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

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