class ParallelTests::Test::RuntimeLogger

def self.class_directory(suspect)

tweaking / post-processing to match correctly for any given project
Note: this is a best guess at conventional test directory structure, and may need 
def self.class_directory(suspect)
  result = "test/"
  if defined?(Rails)
    result += case suspect.superclass.name
    when "ActionDispatch::IntegrationTest"
      "integration/"
    when "ActionDispatch::PerformanceTest"
      "performance/"
    when "ActionController::TestCase"
      "functional/"
    when "ActionView::TestCase"
      "unit/helpers/"
    else
      "unit/"
    end
  end
  result
end