Improve rspec dm2 strategy

* Expand foo? to foo_predicate_spec.rb
* Expand foo! to foo_bang_spec.rb
* Execute all public method specs on mutation of private method
* Warn on stderr when no spec file was found (better than nothing to be
  iproved later)

TODO

@@ -8,3 +8,4 @@
 * Mutate options on Regexp literals
 * Support the numerous Rubinius::AST::SendWithArguments mutations.
 * Fix rubinius to allow setting @vcall_style variable in Rubinius::AST::Send nodes.
+* Aggregate warnings on missing spec files

lib/mutant.rb

@@ -91,6 +91,8 @@ require 'mutant/killer/static'
 require 'mutant/killer/rspec'
 require 'mutant/killer/forking'
 require 'mutant/strategy'
+require 'mutant/strategy/rspec'
+require 'mutant/strategy/rspec/example_lookup'
 require 'mutant/runner'
 require 'mutant/cli'
 require 'mutant/color'

lib/mutant/killer/rspec.rb

@@ -52,17 +52,7 @@ module Mutant
       def command_line_arguments
         %W(
           --fail-fast
-        ) + Dir[filename_pattern]
-      end
-
-      # Return filename pattern
-      #
-      # @return [String]
-      #
-      # @api private
-      #
-      def filename_pattern
-        strategy.filename_pattern(mutation)
+        ) + strategy.spec_files(mutation)
       end
     end
   end

lib/mutant/matcher/method.rb

@@ -59,6 +59,18 @@ module Mutant
       #
       attr_reader :method_name
 
+      # Test if method is public
+      #
+      # @return [true]
+      #   if method is public
+      #
+      # @retur [false]
+      #   otherwise
+      #
+      # @api private
+      #
+      abstract_method :public?
+
     private
 
       # Initialize method filter
@@ -77,7 +89,7 @@ module Mutant
 
       # Return method
       #
-      # @return [UnboundMethod]
+      # @return [UnboundMethod, Method]
       #
       # @api private
       #

lib/mutant/matcher/method/instance.rb

@@ -15,6 +15,20 @@ module Mutant
           "#{scope.name}##{method_name}"
         end
 
+        # Test if method is public
+        #
+        # @return [true]
+        #   if method is public
+        #
+        # @return [false]
+        #   otherwise
+        #
+        # @api private
+        #
+        def public?
+          scope.public_method_defined?(method_name)
+        end
+
       private
 
         # Check if node is matched

lib/mutant/matcher/method/singleton.rb

@@ -13,6 +13,22 @@ module Mutant
         def identification
           "#{scope.name}.#{method_name}"
         end
+        memoize :identification
+
+        # Test if method is public
+        #
+        # @return [true]
+        #   if method is public
+        #
+        # @return [false]
+        #   otherwise
+        #
+        # @api private
+        #
+        def public?
+          scope.singleton_class.public_method_defined?(method_name)
+        end
+
 
       private
 

lib/mutant/strategy.rb

@@ -14,54 +14,29 @@ module Mutant
       killer.new(self, mutation)
     end
 
+    # Return killer
+    #
+    # @return [Class:Killer]
+    #
+    # @api private
+    #
     def self.killer
       self::KILLER
     end
 
+    # Static strategies
     class Static < self
+
+      # Always fail to kill strategy
       class Fail < self
         KILLER = Killer::Static::Fail
       end
 
+      # Always succeed to kill strategy
       class Success < self
         KILLER = Killer::Static::Success
       end
-    end
 
-    class Rspec < self
-
-      KILLER = Killer::Forking.new(Killer::Rspec)
-
-      class DM2 < self
-
-        def self.filename_pattern(mutation)
-          subject = mutation.subject
-          name = subject.context.scope.name
-          
-          matcher = subject.matcher
-
-          append = matcher.kind_of?(Matcher::Method::Singleton) ? '/class_methods' : ''
-
-          path = Inflector.underscore(name)
-
-          base = "spec/unit/#{path}#{append}"
-
-          "#{base}/#{matcher.method_name}_spec.rb"
-        end
-
-      end
-
-      class Unit < self
-        def self.filename_pattern(mutation)
-          'spec/unit/**/*_spec.rb'
-        end
-      end
-
-      class Full < self
-        def self.filename_pattern(mutation)
-          'spec/**/*_spec.rb'
-        end
-      end
     end
   end
 end

lib/mutant/strategy/rspec.rb

@@ -0,0 +1,59 @@
+module Mutant
+  class Strategy
+
+    # Rspec strategy base class
+    class Rspec < self
+
+      KILLER = Killer::Forking.new(Killer::Rspec)
+
+      # DM2-style strategy
+      class DM2 < self
+
+        # Return filename pattern
+        #
+        # @return [String]
+        #
+        # @api private
+        #
+        def self.spec_files(mutation)
+          ExampleLookup.run(mutation)
+        end
+      end
+
+      # Run all unit specs per mutation
+      class Unit < self
+
+        # Return file name pattern for mutation
+        #
+        # @return [Mutation]
+        #
+        # @api private
+        #
+        def self.spec_files(mutation)
+          Dir['spec/unit/**/*_spec.rb']
+        end
+      end
+
+      # Run all integration specs per mutation
+      class Unit < self
+
+        # Return file name pattern for mutation
+        #
+        # @return [Mutation]
+        #
+        # @api private
+        #
+        def self.spec_files(mutation)
+          Dir['spec/integration/**/*_spec.rb']
+        end
+      end
+
+      # Run all specs per mutation
+      class Full < self
+        def self.spec_files(mutation)
+          Dir['spec/**/*_spec.rb']
+        end
+      end
+    end
+  end
+end

lib/mutant/strategy/rspec/example_lookup.rb

@@ -0,0 +1,119 @@
+module Mutant
+  class Strategy
+    class Rspec
+
+      # Example lookup for rspec
+      class ExampleLookup
+        include Adamantium::Flat, Equalizer.new(:mutation)
+
+        # Perform example lookup
+        #
+        # @param [Mutation]
+        #
+        # @return [Enumerable<String>]
+        #
+        # @api private
+        #
+        def self.run(mutation)
+          new(mutation).spec_files
+        end
+
+        # Return mutation
+        #
+        # @return [Mutation]
+        #
+        # @api private
+        #
+        attr_reader :mutation
+
+        # Return spec files
+        #
+        # @return [Enumerable<String>]
+        #
+        # @api private
+        #
+        def spec_files
+          expression = glob_expression
+          files = Dir[expression]
+
+          $stderr.puts("Spec file(s): #{expression.inspect} not found for #{mutation.inspect}")
+
+          files
+        end
+        memoize :spec_files
+
+      private
+
+        # Return method matcher
+        #
+        # @return [Matcher]
+        #
+        # @api private
+        #
+        def matcher
+          mutation.subject.matcher
+        end
+
+        # Return spec file
+        #
+        # @return [String]
+        #
+        # @api private
+        #
+        def spec_file
+          matcher.method_name.to_s.
+            gsub(/\?\z/, 'predicate').
+            gsub(/!\z/, 'bang') + '_spec.rb'
+        end
+        memoize :spec_file
+
+        # Return glob expression
+        #
+        # @return [String]
+        #
+        # @api private
+        #
+        def glob_expression
+          if mutation.subject.matcher.public?
+            "#{base_path}/#{spec_file}"
+          else
+            "#{base_path}/*_spec.rb"
+          end
+        end
+
+        # Return instance of singleton path appendo
+        #
+        # @return [String]
+        #
+        # @api private
+        #
+        def scope_append
+          matcher.kind_of?(Matcher::Method::Singleton) ? '/class_methods' : ''
+        end
+        memoize :scope_append
+
+        # Return base path
+        #
+        # @return [String]
+        #
+        # @api private
+        #
+        def base_path
+          "spec/unit/#{Inflector.underscore(mutation.subject.context.scope.name)}#{scope_append}"
+        end
+        memoize :base_path
+
+        # Initalize object
+        #
+        # @param [Mutation] mutation
+        #
+        # @api private
+        #
+        def initialize(mutation)
+          @mutation = mutation
+        end
+
+      end
+    end
+  end
+end

spec/unit/mutant/killer/rspec/class_methods/new_spec.rb

@@ -4,7 +4,7 @@ describe Mutant::Killer::Rspec, '.new' do
 
   subject { object.new(strategy, mutation) }
 
-  let(:strategy) { mock('Strategy', :filename_pattern => 'foo') }
+  let(:strategy) { mock('Strategy', :spec_files => ['foo']) }
   let(:context)  { mock('Context')  }
   let(:mutation) { mock('Mutation') }