Add mutation from #method to #public_method

Closes #509

lib/mutant/mutator/node/send.rb

@@ -20,6 +20,7 @@ module Mutant
           map:           %i[each],
           send:          %i[public_send __send__],
           __send__:      %i[public_send],
+          method:        %i[public_method],
           gsub:          %i[sub],
           eql?:          %i[equal?],
           to_s:          %i[to_str],

meta/send.rb

@@ -40,6 +40,17 @@ Mutant::Meta::Example.add do
   mutation 'self.const_get(bar)'
 end
 
+Mutant::Meta::Example.add do
+  source 'method(bar)'
+
+  singleton_mutations
+  mutation 'public_method(bar)'
+  mutation 'method'
+  mutation 'bar'
+  mutation 'method(nil)'
+  mutation 'method(self)'
+end
+
 Mutant::Meta::Example.add do
   source 'a >= b'