Refactor mutation emitter to support unparser 0.1.0

Cleans up the body mutator and fix blind spot.

lib/mutant/mutator/node/begin.rb

@@ -19,9 +19,7 @@ module Mutant
         #
         def dispatch
           Util::Array.each(children, self) do |children|
-            if children.length > 1
-              emit_self(*children)
-            end
+            emit_child_subset(children)
           end
           children.each_with_index do |child, index|
             mutate_child(index)
@@ -29,18 +27,22 @@ module Mutant
           end
         end
 
-        # Test if parent input is a send
+        # Emit child subset
         #
-        # @return [true]
-        #   if parent input is a send node
+        # @param [Array<Parser::AST::Node>] nodes
         #
-        # @return [false]
-        #   otherwise
+        # @return [undefined]
         #
         # @api private
         #
-        def parent_send?
-          parent && parent.input.type == :send
+        def emit_child_subset(children)
+          case children.length
+          when 0
+          when 1
+            emit(children.first)
+          else
+            emit_self(*children)
+          end
         end
 
       end # Block

lib/mutant/node_helpers.rb

@@ -18,13 +18,13 @@ module Mutant
     module_function :s
 
     NAN =
-      s(:begin, s(:send, s(:float,  0.0), :/, s(:args, s(:float, 0.0))))
+      s(:send, s(:float,  0.0), :/, s(:args, s(:float, 0.0)))
     INFINITY =
-      s(:begin, s(:send, s(:float,  1.0), :/, s(:args, s(:float, 0.0))))
+      s(:send, s(:float,  1.0), :/, s(:args, s(:float, 0.0)))
     NEW_OBJECT =
       s(:send, s(:const, s(:cbase), :Object), :new)
     NEGATIVE_INFINITY =
-      s(:begin, s(:send, s(:float, -1.0), :/, s(:args, s(:float, 0.0))))
+      s(:send, s(:float, -1.0), :/, s(:args, s(:float, 0.0)))
 
     RAISE             = s(:send, nil, :raise)
 

mutant.gemspec

@@ -19,7 +19,7 @@ Gem::Specification.new do |gem|
   gem.executables      = %w[mutant]
 
   gem.add_runtime_dependency('parser',              '~> 2.0.0.pre6')
-  gem.add_runtime_dependency('unparser',            '~> 0.0.17')
+  gem.add_runtime_dependency('unparser',            '~> 0.1.0')
   gem.add_runtime_dependency('ice_nine',            '~> 0.8')
   gem.add_runtime_dependency('descendants_tracker', '~> 0.0.1')
   gem.add_runtime_dependency('adamantium',          '~> 0.1.0')

spec/shared/mutator_behavior.rb

@@ -86,8 +86,9 @@ shared_examples_for 'a mutator' do
       if message.any?
 
         message = sprintf(
-          "Original:\n%s\n-----\n%s",
+          "Original:\n%s\n%s\n-----\n%s",
           generate(node),
+          node.inspect,
           message.join("\n-----\n")
         )