forked from rubocop/rubocop-minitest
/
refute_false.rb
76 lines (64 loc) · 2.2 KB
/
refute_false.rb
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# frozen_string_literal: true
module RuboCop
module Cop
module Minitest
# This cop enforces the use of `refute(object)`
# over `assert_equal(false, object)`.
#
# @example
# # bad
# assert_equal(false, actual)
# assert_equal(false, actual, 'message')
#
# assert(!test)
# assert(!test, 'message')
#
# # good
# refute(actual)
# refute(actual, 'message')
#
class RefuteFalse < Cop
include ArgumentRangeHelper
MSG_FOR_ASSERT_EQUAL = 'Prefer using `refute(%<arguments>s)` over ' \
'`assert_equal(false, %<arguments>s)`.'
MSG_FOR_ASSERT = 'Prefer using `refute(%<arguments>s)` over ' \
'`assert(!%<arguments>s)`.'
RESTRICT_ON_SEND = %i[assert_equal assert].freeze
def_node_matcher :assert_equal_with_false, <<~PATTERN
(send nil? :assert_equal false $_ $...)
PATTERN
def_node_matcher :assert_with_bang_argument, <<~PATTERN
(send nil? :assert (send $_ :!) $...)
PATTERN
def on_send(node)
actual, rest_receiver_arg = assert_equal_with_false(node) ||
assert_with_bang_argument(node)
return unless actual
message_argument = rest_receiver_arg.first
arguments = [actual.source, message_argument&.source].compact.join(', ')
message = if node.method?(:assert_equal)
MSG_FOR_ASSERT_EQUAL
else
MSG_FOR_ASSERT
end
add_offense(node, message: format(message, arguments: arguments))
end
def autocorrect(node)
lambda do |corrector|
corrector.replace(node.loc.selector, 'refute')
assert_equal_with_false(node) do |actual|
corrector.replace(
first_and_second_arguments_range(node), actual.source
)
end
assert_with_bang_argument(node) do |actual|
corrector.replace(
first_argument_range(node), actual.source
)
end
end
end
end
end
end
end