class RuboCop::Cop::RSpec::MissingExampleGroupArgument

end
describe “A feature example” do
end
describe TestedClass do
# good
end
RSpec.describe do
end
describe do
# bad
@example
Checks that the first argument to an example group is not empty.

def on_block(node) 

def on_block(node)
  return unless example_group?(node)
  return if node.send_node.arguments?
  add_offense(node, message: format(MSG, method: node.method_name))
end