Add simple mutator for defines

lib/mutant.rb

@@ -54,7 +54,7 @@ require 'mutant/mutator/literal/regex'
 require 'mutant/mutator/block'
 require 'mutant/mutator/noop'
 require 'mutant/mutator/call'
-require 'mutant/mutator/call'
+require 'mutant/mutator/define'
 require 'mutant/mutator/if_statement'
 require 'mutant/mutator/receiver_case'
 require 'mutant/loader' 

lib/mutant/mutator/define.rb

@@ -0,0 +1,24 @@
+module Mutant
+  class Mutator
+    class Define < self
+
+      handle(Rubinius::AST::Define)
+
+    private
+
+      # Emit mutations
+      #
+      # @return [undefined]
+      #
+      # @api private
+      #
+      def dispatch
+        Mutator.each(node.body) do |mutation|
+          node = dup_node
+          node.body = mutation
+          emit_safe(node)
+        end
+      end
+    end
+  end
+end

spec/unit/mutant/mutator/define/mutation_spec.rb

@@ -0,0 +1,22 @@
+require 'spec_helper'
+
+describe Mutant::Mutator, 'define' do
+
+  context 'with no arguments' do
+    let(:source) { 'def foo; self.bar; self.baz; end' }
+
+    let(:mutations) do
+      mutations = []
+
+      # Mutation of each statement in block
+      mutations << 'def foo; bar; self.baz; end'
+      mutations << 'def foo; self.bar; baz; end'
+
+      # Remove statement in block
+      mutations << 'def foo; self.baz; end'
+      mutations << 'def foo; self.bar; end'
+    end
+
+    it_should_behave_like 'a mutator'
+  end
+end