Merge pull request #71 from mbj/const-mutator

Const access and assignment mutators

config/flay.yml

@@ -1,3 +1,3 @@
 ---
 threshold: 16
-total_score: 722
+total_score: 730

lib/mutant.rb

@@ -54,17 +54,17 @@ require 'mutant/mutator/node/literal/array'
 require 'mutant/mutator/node/literal/hash'
 require 'mutant/mutator/node/literal/regex'
 require 'mutant/mutator/node/literal/nil'
-require 'mutant/mutator/node/assignment'
 require 'mutant/mutator/node/argument'
 require 'mutant/mutator/node/arguments'
 require 'mutant/mutator/node/begin'
-require 'mutant/mutator/node/variable'
+require 'mutant/mutator/node/named_value/access'
+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/send'
 require 'mutant/mutator/node/send/binary'
 require 'mutant/mutator/node/when'
-require 'mutant/mutator/node/assignment'
 require 'mutant/mutator/node/define'
 require 'mutant/mutator/node/mlhs'
 require 'mutant/mutator/node/masgn'

lib/mutant/mutator/node/generic.rb

@@ -13,8 +13,8 @@ module Mutant
           :zsuper, :not, :or, :and, :defined,
           :next, :break, :match, :ensure,
           :dstr, :dsym, :yield, :rescue, :redo, :defined?,
-          :const, :blockarg, :block_pass, :op_asgn, :and_asgn,
+          :blockarg, :block_pass, :op_asgn, :and_asgn,
-          :regopt, :restarg, :casgn, :resbody, :retry, :arg_expr,
+          :regopt, :restarg, :resbody, :retry, :arg_expr,
           :kwrestarg, :kwoptarg, :kwarg, :undef, :module, :cbase, :empty,
           :alias, :for, :xstr, :back_ref, :nth_ref, :class,
           :sclass, :match_with_lvasgn, :match_current_line, :or_asgn, :kwbegin

lib/mutant/mutator/node/named_value/access.rb

@@ -0,0 +1,27 @@
+module Mutant
+  class Mutator
+    class Node
+      module NamedValue
+
+        # Mutation emitter to handle value access nodes
+        class Access < Node
+
+          handle(:gvar, :cvar, :ivar, :lvar, :const)
+
+        private
+
+          # Emit mutations
+          #
+          # @return [undefined]
+          #
+          # @api private
+          #
+          def dispatch
+            emit_nil
+          end
+
+        end # Access
+      end # NamedValue
+    end # Node
+  end # Mutator
+end # Mutant

lib/mutant/mutator/node/named_value/constant_assignment.rb

@@ -0,0 +1,42 @@
+module Mutant
+  class Mutator
+    class Node
+      module NamedValue
+
+        # Mutation emitter to handle constant assignment nodes
+        class ConstantAssignment < Node
+
+          children :cbase, :name, :value
+
+          handle :casgn
+
+        private
+
+          # Perform dispatch
+          #
+          # @return [undefined]
+          #
+          # @api private
+          #
+          def dispatch
+            mutate_name
+            emit_value_mutations if value
+          end
+
+          # Emit name mutations
+          #
+          # @return [undefined]
+          #
+          # @api private
+          #
+          def mutate_name
+            Mutator::Util::Symbol.each(name, self) do |name|
+              emit_name(name.upcase)
+            end
+          end
+
+        end # ConstantAssignment
+      end # NamedValue
+    end # Node
+  end # Mutator
+end # Mutant

lib/mutant/mutator/node/named_value/variable_assignment.rb

@@ -1,11 +1,10 @@
 module Mutant
   class Mutator
     class Node
-      # Mutator base class for assignments
+      module NamedValue
-      class Assignment < self
 
-        # Mutator for variable assignment
+        # Mutation emitter to handle variable assignment nodes
-        class Variable < self
+        class VariableAssignment < Node
 
           children :name, :value
 
@@ -40,12 +39,12 @@ module Mutant
           def mutate_name
             prefix = MAP.fetch(node.type)
             Mutator::Util::Symbol.each(name, self) do |name|
-              emit_name("#{prefix}#{name}")
+              emit_name(prefix + name.to_s)
             end
           end
 
-        end # Variable
+        end # VariableAssignment
-      end # Assignment
+      end # NamedValue
     end # Node
   end # Mutator
 end # Mutant

lib/mutant/mutator/node/variable.rb

@@ -1,25 +0,0 @@
-module Mutant
-  class Mutator
-    class Node
-
-      # Mutation emitter to handle variable nodes
-      class Variable < self
-
-        handle(:gvar, :cvar, :ivar, :lvar)
-
-      private
-
-        # Emit mutations
-        #
-        # @return [undefined]
-        #
-        # @api private
-        #
-        def dispatch
-          emit_nil
-        end
-
-      end # Variable
-    end # Node
-  end # Mutator
-end # Mutant

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

@@ -1,21 +0,0 @@
-require 'spec_helper'
-
-describe Mutant::Mutator, 'cvar' do
-
-  before do
-    Mutant::Random.stub(:hex_string => 'random')
-  end
-
-  let(:source) { '@@a = nil; @@a' }
-
-  let(:mutations) do
-    mutants = []
-    mutants << '@@a = nil; nil'
-    mutants << '@@a = nil'
-    mutants << '@@a'
-    mutants << '@@a = ::Object.new; @@a'
-    mutants << '@@srandom = nil; @@a'
-  end
-
-  it_should_behave_like 'a mutator'
-end

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

@@ -1,21 +0,0 @@
-require 'spec_helper'
-
-describe Mutant::Mutator, 'gvar' do
-
-  before do
-    Mutant::Random.stub(:hex_string => 'random')
-  end
-
-  let(:source) { '$a = nil; $a' }
-
-  let(:mutations) do
-    mutants = []
-    mutants << '$a = nil; nil'
-    mutants << '$a = nil'
-    mutants << '$a'
-    mutants << '$a = ::Object.new; $a'
-    mutants << '$srandom = nil; $a'
-  end
-
-  it_should_behave_like 'a mutator'
-end

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

@@ -1,21 +0,0 @@
-require 'spec_helper'
-
-describe Mutant::Mutator, 'ivar' do
-
-  before do
-    Mutant::Random.stub(:hex_string => 'random')
-  end
-
-  let(:source) { '@a = nil; @a' }
-
-  let(:mutations) do
-    mutants = []
-    mutants << '@a = nil; nil'
-    mutants << '@a = nil'
-    mutants << '@a'
-    mutants << '@a = ::Object.new; @a'
-    mutants << '@srandom = nil; @a'
-  end
-
-  it_should_behave_like 'a mutator'
-end

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

@@ -1,21 +0,0 @@
-require 'spec_helper'
-
-describe Mutant::Mutator, 'lvar' do
-
-  before do
-    Mutant::Random.stub(:hex_string => 'random')
-  end
-
-  let(:source) { 'a = nil; a' }
-
-  let(:mutations) do
-    mutants = []
-    mutants << 'a = nil; nil'
-    mutants << 'a = nil'
-    mutants << 'a'
-    mutants << 'a = ::Object.new; a'
-    mutants << 'srandom = nil; a'
-  end
-
-  it_should_behave_like 'a mutator'
-end

spec/unit/mutant/mutator/node/named_value/access/mutation_spec.rb

@@ -0,0 +1,77 @@
+require 'spec_helper'
+
+describe Mutant::Mutator::Node::NamedValue::Access, 'mutations' do
+
+  before do
+    Mutant::Random.stub(:hex_string => :random)
+  end
+
+  context 'global variable' do
+    let(:source) { '$a = nil; $a' }
+
+    let(:mutations) do
+      mutants = []
+      mutants << '$a = nil; nil'
+      mutants << '$a = nil'
+      mutants << '$a'
+      mutants << '$a = ::Object.new; $a'
+      mutants << '$srandom = nil; $a'
+    end
+
+    it_should_behave_like 'a mutator'
+  end
+
+  context 'class variable' do
+    let(:source) { '@@a = nil; @@a' }
+
+    let(:mutations) do
+      mutants = []
+      mutants << '@@a = nil; nil'
+      mutants << '@@a = nil'
+      mutants << '@@a'
+      mutants << '@@a = ::Object.new; @@a'
+      mutants << '@@srandom = nil; @@a'
+    end
+  end
+
+  context 'instance variable' do
+    let(:source) { '@a = nil; @a' }
+
+    let(:mutations) do
+      mutants = []
+      mutants << '@a = nil; nil'
+      mutants << '@a = nil'
+      mutants << '@a'
+      mutants << '@a = ::Object.new; @a'
+      mutants << '@srandom = nil; @a'
+    end
+
+    it_should_behave_like 'a mutator'
+  end
+
+  context 'local variable' do
+    let(:source) { 'a = nil; a' }
+
+    let(:mutations) do
+      mutants = []
+      mutants << 'a = nil; nil'
+      mutants << 'a = nil'
+      mutants << 'a'
+      mutants << 'a = ::Object.new; a'
+      mutants << 'srandom = nil; a'
+    end
+
+    it_should_behave_like 'a mutator'
+  end
+
+  context 'constant' do
+    let(:source) { 'A' }
+
+    let(:mutations) do
+      mutants = []
+      mutants << 'nil'
+    end
+
+    it_should_behave_like 'a mutator'
+  end
+end

spec/unit/mutant/mutator/node/named_value/constant_assignment/mutation_spec.rb

@@ -0,0 +1,20 @@
+require 'spec_helper'
+
+describe Mutant::Mutator::Node::NamedValue::VariableAssignment, 'mutations' do
+
+  before do
+    Mutant::Random.stub(:hex_string => :random)
+  end
+
+  let(:source) { 'A = true' }
+
+  let(:mutations) do
+    mutations = []
+
+    mutations << 'SRANDOM = true'
+    mutations << 'A = false'
+    mutations << 'A = nil'
+  end
+
+  it_should_behave_like 'a mutator'
+end

spec/unit/mutant/mutator/node/named_value/variable_assignment/mutation_spec.rb

@@ -1,6 +1,6 @@
 require 'spec_helper'
 
-describe Mutant::Mutator::Node::Assignment, 'mutations' do
+describe Mutant::Mutator::Node::NamedValue::VariableAssignment, 'mutations' do
 
   before do
     Mutant::Random.stub(:hex_string => :random)