undo somehow works now

lib/parallel_tests/test/runtime_logger.rb

@@ -8,12 +8,12 @@ class RuntimeLogger
       @@prepared = false
 
       class << self
-        def log_test_run(file)
+        def log_test_run(test)
           prepare
 
           result = nil
           time = ParallelTests.delta { result = yield }
-          log(file, time)
+          log(test, time)
 
           result
         end
@@ -51,14 +51,20 @@ def prepare
           File.write(logfile, '')
         end
 
-        def log(file, time)
-          return unless file
+        def log(test, time)
+          return unless message = message(test, time)
           with_locked_log do |logfile|
-            logfile.seek 0, IO::SEEK_END
-            logfile.puts "#{file.sub("#{Dir.pwd}/", "")}:#{time}"
+            logfile.seek(0, IO::SEEK_END)
+            logfile.puts message
           end
         end
 
+        def message(test, delta)
+          return unless method = test.public_instance_methods(true).detect { |m| m =~ /^test_/ }
+          filename = test.instance_method(method).source_location.first.sub("#{Dir.pwd}/", "")
+          "#{filename}:#{delta}"
+        end
+
         def logfile
           ParallelTests::Test::Runner.runtime_log
         end
@@ -67,16 +73,18 @@ def logfile
   end
 end
 
-if defined?(Minitest::Test) # Minitest 5
-  Minitest::Test.prepend(
-    Module.new do
-      def run(*)
-        ParallelTests::Test::RuntimeLogger.log_test_run(method(name).source_location.first) do
-          super
+if defined?(Minitest::Runnable) # Minitest 5
+  class << Minitest::Runnable
+    prepend(
+      Module.new do
+        def run(*)
+          ParallelTests::Test::RuntimeLogger.log_test_run(self) do
+            super
+          end
         end
       end
-    end
-  )
+    )
+  end
 
   class << Minitest
     prepend(