Add string literal mutations

CHANGELOG.md

@@ -8,6 +8,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/).
 
 ### Added
 
+- String literal mutations (`'foo'` -> `'foo__mutest__'`) [[#58](https://github.com/backus/mutest/pull/58/files) ([@dgollahon][])]
 - Selector mutations for `[public_]method` methods (`foo.method(:to_s)` -> `foo.method(:to_str)`) [[#56](https://github.com/backus/mutest/pull/56/files) ([@dgollahon][])]
 - Block-pass symbol#to_proc mutations (`foo(&:to_s)` -> `foo(&:to_str)`) [[#55](https://github.com/backus/mutest/pull/55/files) ([@dgollahon][])]
 - Block-pass mutations (`foo(&method(:bar))` -> `foo(&public_method(:bar))`) [[#54](https://github.com/backus/mutest/pull/54/files) ([@dgollahon][])]

lib/mutest/mutator/node/literal/string.rb

@@ -6,13 +6,16 @@ class Literal
         class String < self
           handle(:str)
 
+          children :value
+
           private
 
           # Emit mutations
           #
           # @return [undefined]
           def dispatch
             emit_singletons
+            emit_type(value + Util::Symbol::POSTFIX)
           end
         end # String
       end # Literal

lib/mutest/mutator/node/literal/symbol.rb

@@ -8,8 +8,6 @@ class Symbol < self
 
           children :value
 
-          PREFIX = '__mutest__'.freeze
-
           private
 
           # Emit mutations

meta/dstr.rb

@@ -8,4 +8,6 @@
   mutation '"foo#{bar}#{self}"'
   mutation '"foo#{nil}baz"'
   mutation '"foo#{self}baz"'
+  mutation '"foo__mutest__#{bar}baz"'
+  mutation '"foo#{bar}baz__mutest__"'
 end

meta/dsym.rb

@@ -9,4 +9,6 @@
   mutation ':"#{"foo"}#{self}#{"baz"}"'
   mutation ':"#{"foo"}#{bar}#{nil}"'
   mutation ':"#{"foo"}#{bar}#{self}"'
+  mutation ':"foo__mutest__#{bar}baz"'
+  mutation ':"foo#{bar}baz__mutest__"'
 end

meta/send.rb

@@ -905,6 +905,7 @@
   mutation 'foo.public_method(nil)'
   mutation 'foo.public_method(self)'
   mutation 'foo.public_method("to_int")'
+  mutation 'foo.public_method("to_i__mutest__")'
 end
 
 Mutest::Meta::Example.add :send do
@@ -930,6 +931,7 @@
   mutation 'foo'
   mutation '"to_s"'
   mutation 'self.bar("to_s")'
+  mutation 'foo.bar("to_s__mutest__")'
   mutation 'foo.bar'
   mutation 'foo.bar(nil)'
   mutation 'foo.bar(self)'

meta/str.rb

@@ -2,4 +2,5 @@
   source '"foo"'
 
   singleton_mutations
+  mutation '"foo__mutest__"'
 end