Add mutation foo.baz { bar } -> foo.bar

closes #271

Changelog.md

@@ -3,6 +3,7 @@
 * Add mutation from `a != b` to `!a.eql?(b)` and `!a.equal?(b)` #417
 * Add mutation `A.const_get(:B)` -> `A::B` #426
 * Add mutation `def foo(*args); end` into `def foo(*args); args = []; end` #423
+* Add mutation from `foo.baz { bar }` to `foo.bar` #416
 
 # v0.8.3 2015-09-01
 

config/flay.yml

@@ -1,3 +1,3 @@
 ---
 threshold: 18
-total_score: 1219
+total_score: 1223

lib/mutant/mutator/node/block.rb

@@ -36,6 +36,22 @@ module Mutant
           return unless body
           emit(body)
           emit_body_mutations
+
+          mutate_body_receiver
+        end
+
+        # Mutate method send in body scope of `send`
+        #
+        # @return [undefined]
+        #
+        # @api private
+        def mutate_body_receiver
+          return unless n_send?(body)
+
+          body_meta = AST::Meta::Send.new(body)
+          send_meta = AST::Meta::Send.new(send)
+
+          emit(s(:send, send_meta.receiver, body_meta.selector, *body_meta.arguments))
         end
 
       end # Block

meta/block.rb

@@ -69,3 +69,18 @@ Mutant::Meta::Example.add do
   mutation 'foo { |(_a)| }'
   mutation 'foo'
 end
+
+Mutant::Meta::Example.add do
+  source 'self.foo { bar(nil) }'
+
+  singleton_mutations
+  mutation 'self.foo'
+  mutation 'foo { bar(nil) }'
+  mutation 'self.foo { bar }'
+  mutation 'self.foo { nil }'
+  mutation 'self.foo {}'
+  mutation 'self.foo { self }'
+  mutation 'self.foo { raise }'
+  mutation 'bar(nil)'
+  mutation 'self.bar(nil)'
+end