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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module RSpec
# Check that `all` matcher is used instead of iterating over an array.
#
# @example
# # bad
# it 'validates users' do
# [user1, user2, user3].each { |user| expect(user).to be_valid }
# end
#
# # good
# it 'validates users' do
# expect([user1, user2, user3]).to all(be_valid)
# end
class IteratedExpectation < Base
MSG = 'Prefer using the `all` matcher instead ' \
'of iterating over an array.'
# @!method each?(node)
def_node_matcher :each?, <<-PATTERN
(block
(send ... :each)
(args (arg $_))
$(...)
)
PATTERN
# @!method expectation?(node)
def_node_matcher :expectation?, <<-PATTERN
(send (send nil? :expect (lvar %)) :to ...)
PATTERN
def on_block(node)
each?(node) do |arg, body|
if single_expectation?(body, arg) || only_expectations?(body, arg)
add_offense(node.send_node)
end
end
end
private
def single_expectation?(body, arg)
expectation?(body, arg)
end
def only_expectations?(body, arg)
return false unless body.each_child_node.any?
body.each_child_node.all? { |child| expectation?(child, arg) }
end
end
end
end
end
Version data entries
14 entries across 12 versions & 2 rubygems