class RuboCop::Cop::Minitest::DuplicateTestRun

def parent_class_has_test_methods?(class_node)
  parent_class = class_node.parent_class
  return false unless (class_node_parent = class_node.parent)
  parent_class_node = class_node_parent.each_child_node(:class).detect do |klass|
    klass.identifier == parent_class
  end
  return false unless parent_class_node
  test_methods?(parent_class_node)
end