class RuboCop::Cop::InternalAffairs::UselessMessageAssertion


expect(cop.messages).to eq([‘Do not write bad code like that.’])
# good
expect(cop.messages).to eq()
# bad
@example
Checks that cops are not tested using ‘described_class::MSG`.

def assertions_using_described_class_msg 

def assertions_using_described_class_msg
  described_class_msg(processed_source.ast).reject do |node|
    node.ancestors.any?(&method(:rspec_expectation_on_msg?))
  end
end

def contains_described_class_msg?(node) 

def contains_described_class_msg?(node)
  described_class_msg(node).any?
end

def investigate(_processed_source) 

def investigate(_processed_source)
  assertions_using_described_class_msg.each do |node|
    add_offense(node)
  end
end

def relevant_file?(file)

Only process spec files 
def relevant_file?(file)
  file.end_with?('_spec.rb')
end