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Merge pull request rubocop#860 from lazycoder9/cop/repeated_describe
[Close rubocop#856] implement repeated example group description/body cops
2 parents 218d2a0 + 32d2e2f commit f7fe011

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‎CHANGELOG.md

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* Fix `RSpec/InstanceVariable` detection inside custom matchers. ([@pirj][])
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* Fix `RSpec/ScatteredSetup` to distinguish hooks with different metadata. ([@pirj][])
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* Add autocorrect support for `RSpec/ExpectActual` cop. ([@dduugg][], [@pirj][])
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* Add `RSpec/RepeatedExampleGroupBody` cop. ([@lazycoder9][])
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* Add `RSpec/RepeatedExampleGroupDescription` cop. ([@lazycoder9][])
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## 1.37.1 (2019-12-16)
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@@ -477,3 +479,4 @@ Compatibility release so users can upgrade RuboCop to 0.51.0. No new features.
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[@jfragoulis]: https://github.com/jfragoulis
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[@ybiquitous]: https://github.com/ybiquitous
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[@dduugg]: https://github.com/dduugg
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[@lazycoder9]: https://github.com/lazycoder9

‎config/default.yml

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Description: Check for repeated examples within example groups.
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StyleGuide: https://www.rubydoc.info/gems/rubocop-rspec/RuboCop/Cop/RSpec/RepeatedExample
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RSpec/RepeatedExampleGroupBody:
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Enabled: true
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Description: Check for repeated describe and context block body.
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StyleGuide: https://www.rubydoc.info/gems/rubocop-rspec/RuboCop/Cop/RSpec/RepeatedExampleGroupBody
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RSpec/RepeatedExampleGroupDescription:
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Enabled: true
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Description: Check for repeated example group descriptions.
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StyleGuide: https://www.rubydoc.info/gems/rubocop-rspec/RuboCop/Cop/RSpec/RepeatedExampleGroupDescription
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RSpec/ReturnFromStub:
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Enabled: true
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Description: Checks for consistent style of stub's return setting.

‎lib/rubocop/cop/rspec/repeated_example_group_body.rb

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# frozen_string_literal: true
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module RuboCop
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module Cop
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module RSpec
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# Check for repeated describe and context block body.
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#
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# @example
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#
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# # bad
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# describe 'cool feature x' do
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# it { cool_predicate }
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# end
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#
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# describe 'cool feature y' do
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# it { cool_predicate }
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# end
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#
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# # good
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# describe 'cool feature' do
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# it { cool_predicate }
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# end
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#
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# describe 'another cool feature' do
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# it { another_predicate }
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# end
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#
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# # good
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# context 'when case x', :tag do
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# it { cool_predicate }
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# end
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#
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# context 'when case y' do
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# it { cool_predicate }
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# end
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#
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class RepeatedExampleGroupBody < Cop
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MSG = 'Repeated %<group>s block body on line(s) %<loc>s'
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def_node_matcher :several_example_groups?, <<-PATTERN
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(begin <#example_group_with_body? #example_group_with_body? ...>)
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PATTERN
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def_node_matcher :metadata, '(block (send _ _ _ $...) ...)'
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def_node_matcher :body, '(block _ args $...)'
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def_node_matcher :skip_or_pending?, <<-PATTERN
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(block <(send nil? {:skip :pending}) ...>)
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PATTERN
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def on_begin(node)
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return unless several_example_groups?(node)
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repeated_group_bodies(node).each do |group, repeats|
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add_offense(group, message: message(group, repeats))
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end
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end
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private
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def repeated_group_bodies(node)
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node
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.children
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.select { |child| example_group_with_body?(child) }
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.reject { |child| skip_or_pending?(child) }
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.group_by { |group| signature_keys(group) }
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.values
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.reject(&:one?)
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.flat_map { |groups| add_repeated_lines(groups) }
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end
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def add_repeated_lines(groups)
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repeated_lines = groups.map(&:first_line)
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groups.map { |group| [group, repeated_lines - [group.first_line]] }
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end
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def signature_keys(group)
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[metadata(group), body(group)]
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end
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def message(group, repeats)
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format(MSG, group: group.method_name, loc: repeats)
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end
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end
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end
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end
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end

‎lib/rubocop/cop/rspec/repeated_example_group_description.rb

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# frozen_string_literal: true
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module RuboCop
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module Cop
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module RSpec
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# Check for repeated example group descriptions.
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#
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# @example
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#
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# # bad
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# describe 'cool feature' do
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# # example group
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# end
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#
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# describe 'cool feature' do
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# # example group
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# end
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#
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# # bad
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# context 'when case x' do
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# # example group
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# end
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#
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# describe 'when case x' do
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# # example group
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# end
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#
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# # good
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# describe 'cool feature' do
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# # example group
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# end
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#
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# describe 'another cool feature' do
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# # example group
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# end
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#
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# # good
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# context 'when case x' do
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# # example group
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# end
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#
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# context 'when another case' do
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# # example group
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# end
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#
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class RepeatedExampleGroupDescription < Cop
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MSG = 'Repeated %<group>s block description on line(s) %<loc>s'
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def_node_matcher :several_example_groups?, <<-PATTERN
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(begin <#example_group? #example_group? ...>)
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PATTERN
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def_node_matcher :doc_string_and_metadata, <<-PATTERN
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(block (send _ _ $_ $...) ...)
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PATTERN
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def_node_matcher :skip_or_pending?, <<-PATTERN
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(block <(send nil? {:skip :pending}) ...>)
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PATTERN
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def_node_matcher :empty_description?, '(block (send _ _) ...)'
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def on_begin(node)
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return unless several_example_groups?(node)
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repeated_group_descriptions(node).each do |group, repeats|
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add_offense(group, message: message(group, repeats))
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end
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end
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private
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def repeated_group_descriptions(node)
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node
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.children
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.select { |child| example_group?(child) }
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.reject { |child| skip_or_pending?(child) }
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.reject { |child| empty_description?(child) }
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.group_by { |group| doc_string_and_metadata(group) }
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.values
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.reject(&:one?)
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.flat_map { |groups| add_repeated_lines(groups) }
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end
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def add_repeated_lines(groups)
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repeated_lines = groups.map(&:first_line)
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groups.map { |group| [group, repeated_lines - [group.first_line]] }
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end
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def message(group, repeats)
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format(MSG, group: group.method_name, loc: repeats)
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end
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end
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end
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end
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end

‎lib/rubocop/cop/rspec_cops.rb

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require_relative 'rspec/receive_never'
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require_relative 'rspec/repeated_description'
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require_relative 'rspec/repeated_example'
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require_relative 'rspec/repeated_example_group_body'
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require_relative 'rspec/repeated_example_group_description'
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require_relative 'rspec/return_from_stub'
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require_relative 'rspec/scattered_let'
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require_relative 'rspec/scattered_setup'

‎manual/cops.md

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* [RSpec/ReceiveNever](cops_rspec.md#rspecreceivenever)
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* [RSpec/RepeatedDescription](cops_rspec.md#rspecrepeateddescription)
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* [RSpec/RepeatedExample](cops_rspec.md#rspecrepeatedexample)
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* [RSpec/RepeatedExampleGroupBody](cops_rspec.md#rspecrepeatedexamplegroupbody)
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* [RSpec/RepeatedExampleGroupDescription](cops_rspec.md#rspecrepeatedexamplegroupdescription)
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* [RSpec/ReturnFromStub](cops_rspec.md#rspecreturnfromstub)
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* [RSpec/ScatteredLet](cops_rspec.md#rspecscatteredlet)
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* [RSpec/ScatteredSetup](cops_rspec.md#rspecscatteredsetup)

‎manual/cops_rspec.md

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* [https://www.rubydoc.info/gems/rubocop-rspec/RuboCop/Cop/RSpec/RepeatedExample](https://www.rubydoc.info/gems/rubocop-rspec/RuboCop/Cop/RSpec/RepeatedExample)
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## RSpec/RepeatedExampleGroupBody
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Enabled by default | Supports autocorrection
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--- | ---
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Enabled | No
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Check for repeated describe and context block body.
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### Examples
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```ruby
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# bad
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describe 'cool feature x' do
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it { cool_predicate }
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end
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describe 'cool feature y' do
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it { cool_predicate }
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end
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# good
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describe 'cool feature' do
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it { cool_predicate }
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end
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describe 'another cool feature' do
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it { another_predicate }
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end
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# good
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context 'when case x', :tag do
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it { cool_predicate }
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end
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context 'when case y' do
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it { cool_predicate }
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end
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```
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### References
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* [https://www.rubydoc.info/gems/rubocop-rspec/RuboCop/Cop/RSpec/RepeatedExampleGroupBody](https://www.rubydoc.info/gems/rubocop-rspec/RuboCop/Cop/RSpec/RepeatedExampleGroupBody)
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## RSpec/RepeatedExampleGroupDescription
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Enabled by default | Supports autocorrection
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--- | ---
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Enabled | No
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Check for repeated example group descriptions.
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### Examples
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```ruby
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# bad
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describe 'cool feature' do
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# example group
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end
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describe 'cool feature' do
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# example group
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end
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# bad
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context 'when case x' do
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# example group
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end
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describe 'when case x' do
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# example group
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end
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# good
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describe 'cool feature' do
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# example group
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end
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describe 'another cool feature' do
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# example group
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end
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# good
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context 'when case x' do
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# example group
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end
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context 'when another case' do
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# example group
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end
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```
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### References
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* [https://www.rubydoc.info/gems/rubocop-rspec/RuboCop/Cop/RSpec/RepeatedExampleGroupDescription](https://www.rubydoc.info/gems/rubocop-rspec/RuboCop/Cop/RSpec/RepeatedExampleGroupDescription)
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## RSpec/ReturnFromStub
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Enabled by default | Supports autocorrection

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