class RuboCop::Cop::Minitest::AssertOutput

def on_gvasgn(node)
  test_case_node = find_test_case(node)
  return unless test_case_node
  gvar_name = node.children.first
  return unless OUTPUT_GLOBAL_VARIABLES.include?(gvar_name)
  assertions(test_case_node).each do |assertion|
    add_offense(assertion, message: format(MSG, name: gvar_name)) if references_gvar?(assertion, gvar_name)
  end
end