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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Minitest
# This cop checks for opportunities to use `assert_output`.
#
# @example
# # bad
# $stdout = StringIO.new
# puts object.method
# $stdout.rewind
# assert_match expected, $stdout.read
#
# # good
# assert_output(expected) { puts object.method }
#
class AssertOutput < Base
include MinitestExplorationHelpers
MSG = 'Use `assert_output` instead of mutating %<name>s.'
OUTPUT_GLOBAL_VARIABLES = %i[$stdout $stderr].freeze
def on_gvasgn(node)
test_case_node = find_test_case(node)
return unless test_case_node
gvar_name = node.children.first
return unless OUTPUT_GLOBAL_VARIABLES.include?(gvar_name)
assertions(test_case_node).each do |assertion|
add_offense(assertion, message: format(MSG, name: gvar_name)) if references_gvar?(assertion, gvar_name)
end
end
private
def find_test_case(node)
def_ancestor = node.each_ancestor(:def).first
def_ancestor if test_case?(def_ancestor)
end
def references_gvar?(assertion, gvar_name)
assertion.each_descendant(:gvar).any? { |d| d.children.first == gvar_name }
end
end
end
end
end
Version data entries
14 entries across 14 versions & 1 rubygems