Add reporting for used tests to kill mutations on a given subject

lib/mutant/reporter/cli/report/subject.rb

@@ -19,6 +19,9 @@ module Mutant
           #
           def run
             status(subject.identification)
+            object.tests.each do |test|
+              puts("- #{test.identification}")
+            end
             object.failed_mutations.each(&method(:visit))
             self
           end

lib/mutant/rspec/test.rb

@@ -4,6 +4,8 @@ module Mutant
     class Test < Mutant::Test
       include Concord.new(:strategy, :example_group)
 
+      PREFIX = :rspec
+
       # Return subject identification
       #
       # @return [String]

lib/mutant/runner/subject.rb

@@ -63,6 +63,17 @@ module Mutant
         failed_mutations.empty?
       end
 
+      # Return tests used to kill mutations on this subject
+      #
+      # @return [Enumerable<Test>]
+      #
+      # @api private
+      #
+      def tests
+        config.strategy.tests(subject)
+      end
+      memoize :tests
+
     private
 
       # Perform operation
@@ -73,7 +84,6 @@ module Mutant
       #
       def run
         progress(subject)
-        tests = config.strategy.tests(subject)
         @mutations = visit_collection(subject.mutations, tests)
         progress(self)
       end

lib/mutant/test.rb

@@ -61,6 +61,17 @@ module Mutant
     #
     abstract_method :run
 
+    # Return test identification
+    #
+    # @return [String]
+    #
+    # @api private
+    #
+    def identification
+      "#{self.class::PREFIX}:#{subject_identification}"
+    end
+    memoize :identification
+
     # Return subject identification
     #
     # This method is used for current mutants primitive test selection.