Improve reporting to show only uncovered mutations

lib/mutant/killer.rb

@@ -84,8 +84,6 @@ module Mutant
       self.class.type
     end
 
-  private
-
     # Return mutation to kill
     #
     # @return [Mutation]
@@ -94,6 +92,8 @@ module Mutant
     #
     attr_reader :mutation
 
+  private
+
     # Initialize killer object
     #
     # @param [Mutation] mutation

lib/mutant/reporter/cli.rb

@@ -26,7 +26,7 @@ module Mutant
       # @api private
       #
       def mutation(mutation)
-        colorized_diff(mutation.original_source, mutation.source)
+        #colorized_diff(mutation.original_source, mutation.source)
         self
       end
 
@@ -65,6 +65,11 @@ module Mutant
 
         puts(colorize(color, "#{word}: #{killer.identification} (%02.2fs)" % killer.runtime))
 
+        if killer.fail?
+          mutation = killer.mutation
+          colorized_diff(mutation.original_source, mutation.source)
+        end
+
         self
       end
 

lib/mutant/strategy/rspec/example_lookup.rb

@@ -36,7 +36,9 @@ module Mutant
           expression = glob_expression
           files = Dir[expression]
 
-          $stderr.puts("Spec file(s): #{expression.inspect} not found for #{mutation.inspect}")
+          if files.empty?
+            $stderr.puts("Spec file(s): #{expression.inspect} not found for #{mutation.inspect}")
+          end
 
           files
         end