Add mutator for zsuper node

lib/mutant.rb

@@ -62,6 +62,7 @@ require 'mutant/mutator/node/named_value/constant_assignment'
 require 'mutant/mutator/node/named_value/variable_assignment'
 require 'mutant/mutator/node/while'
 require 'mutant/mutator/node/super'
+require 'mutant/mutator/node/zsuper'
 require 'mutant/mutator/node/send'
 require 'mutant/mutator/node/send/binary'
 require 'mutant/mutator/node/when'

lib/mutant/mutator/node/generic.rb

@@ -8,7 +8,7 @@ module Mutant
         # These nodes still need a dedicated mutator,
         # your contribution is that close!
         handle(
-          :zsuper, :not, :or, :and, :defined,
+          :not, :or, :and, :defined,
           :next, :break, :match, :ensure,
           :dstr, :dsym, :yield, :rescue, :redo, :defined?,
           :blockarg, :block_pass, :op_asgn, :and_asgn,

lib/mutant/mutator/node/zsuper.rb

@@ -0,0 +1,25 @@
+module Mutant
+  class Mutator
+    class Node
+
+      # Mutator for super without parentheses
+      class ZSuper < self
+
+        handle(:zsuper)
+
+      private
+
+        # Emit mutations
+        #
+        # @return [undefined]
+        #
+        # @api private
+        #
+        def dispatch
+          emit_nil
+        end
+
+      end # ZSuper
+    end # Node
+  end # Mutator
+end # Mutant

spec/unit/mutant/mutator/node/super/mutation_spec.rb

@@ -5,7 +5,12 @@ describe Mutant::Mutator, 'super' do
   context 'with no arguments' do
     let(:source) { 'super' }
 
-    it_should_behave_like 'a noop mutator'
+    let(:mutations) do
+      mutations = []
+      mutations << 'nil'
+    end
+
+    it_should_behave_like 'a mutator'
   end
 
   context 'with explicit empty arguments' do