Add mutation for $ -> \z

config/flay.yml

@@ -1,3 +1,3 @@
 ---
 threshold: 16
-total_score: 1306
+total_score: 1312

lib/mutant.rb

@@ -93,6 +93,7 @@ require 'mutant/mutator/node/generic'
 require 'mutant/mutator/node/regexp'
 require 'mutant/mutator/node/regexp/alternation_meta'
 require 'mutant/mutator/node/regexp/character_type'
+require 'mutant/mutator/node/regexp/end_of_line_anchor'
 require 'mutant/mutator/node/literal'
 require 'mutant/mutator/node/literal/boolean'
 require 'mutant/mutator/node/literal/range'

lib/mutant/mutator/node/generic.rb

@@ -40,6 +40,7 @@ module Mutant
           regexp_alternation_meta
           regexp_bol_anchor
           regexp_digit_type
+          regexp_eol_anchor
           regexp_nondigit_type
           regexp_nonspace_type
           regexp_nonword_boundary_anchor

lib/mutant/mutator/node/regexp/end_of_line_anchor.rb

@@ -0,0 +1,21 @@
+module Mutant
+  class Mutator
+    class Node
+      module Regexp
+        # Mutator for end of line anchor `$`
+        class EndOfLineAnchor < Node
+          handle(:regexp_eol_anchor)
+
+          # Emit mutations
+          #
+          # Replace `$` with `\z`
+          #
+          # @return [undefined]
+          def dispatch
+            emit(s(:regexp_eos_anchor))
+          end
+        end # EndOfLineAnchor
+      end # Regexp
+    end # Node
+  end # Mutator
+end # Mutant

meta/regexp/regexp_eol_anchor.rb

@@ -0,0 +1,8 @@
+Mutant::Meta::Example.add :regexp_eol_anchor do
+  source '/$/'
+
+  singleton_mutations
+  regexp_mutations
+
+  mutation '/\z/'
+end

meta/regexp/regexp_eos_anchor.rb

@@ -0,0 +1,6 @@
+Mutant::Meta::Example.add :regexp_eos_anchor do
+  source '/\z/'
+
+  singleton_mutations
+  regexp_mutations
+end