class RuboCop::Cop::InternalAffairs::RedundantDescribedClassAsSubject

Checks for redundant ‘subject(:cop) { described_class.new }`.

@example

# bad
RSpec.describe RuboCop::Cop::Department::Foo do
  subject(:cop) { described_class.new(config) }
end

# good
RSpec.describe RuboCop::Cop::Department::Foo, :config do
end

Constants

MSG

Public Instance Methods

on_block(node) click to toggle source
# File lib/rubocop/cop/internal_affairs/redundant_described_class_as_subject.rb, line 35
def on_block(node)
  return unless (described_class_arguments = described_class_subject?(node))
  return if described_class_arguments.count >= 2

  describe = find_describe_method_node(node)

  unless (exist_config = describe.last_argument.source == ':config')
    additional_message = ' and specify `:config` in `describe`'
  end

  message = format(MSG, additional_message: additional_message)

  add_offense(node, message: message) do |corrector|
    corrector.remove(range_by_whole_lines(node.source_range, include_final_newline: true))

    corrector.insert_after(describe.last_argument, ', :config') unless exist_config
  end
end

Private Instance Methods

find_describe_method_node(block_node) click to toggle source
# File lib/rubocop/cop/internal_affairs/redundant_described_class_as_subject.rb, line 56
def find_describe_method_node(block_node)
  block_node.ancestors.find { |node| node.block_type? && node.method?(:describe) }.send_node
end