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require "test/unit"
require "test/unit/ui/console/testrunner"
# You can test whether an object is compliant with the ActiveModel API by
# calling ActiveModel::Compliance.test(object). It will emit a Test::Unit
# output that tells you whether your object is fully compliant, or if not,
# which aspects of the API are not implemented.
# These tests do not attempt to determine the semantic correctness of the
# returned values. For instance, you could implement valid? to always
# return true, and the tests would pass. It is up to you to ensure that
# the values are semantically meaningful.
# Objects you pass in are expected to return a compliant object from a
# call to to_model. It is perfectly fine for to_model to return self.
module ActiveModel
module Lint
def self.test(object, verbosity = 2, output = STDOUT)
test_class = do
include Test
define_method(:setup) do
assert object.respond_to?(:to_model), "The object should respond_to :to_model"
@object = object.to_model
end, verbosity, output).start
module Test
def assert_boolean(name, result)
assert result == true || result == false, "#{name} should be a boolean"
# valid?
# ------
# Returns a boolean that specifies whether the object is in a valid or invalid
# state.
def test_valid?
assert @object.respond_to?(:valid?), "The model should respond to valid?"
assert_boolean "valid?", @object.valid?
# new_record?
# -----------
# Returns a boolean that specifies whether the object has been persisted yet.
# This is used when calculating the URL for an object. If the object is
# not persisted, a form for that object, for instance, will be POSTed to the
# collection. If it is persisted, a form for the object will put PUTed to the
# URL for the object.
def test_new_record?
assert @object.respond_to?(:new_record?), "The model should respond to new_record?"
assert_boolean "new_record?", @object.new_record?
def test_destroyed?
assert @object.respond_to?(:new_record?), "The model should respond to destroyed?"
assert_boolean "destroyed?", @object.destroyed?
# errors
# ------
# Returns an object that has :[] and :full_messages defined on it. See below
# for more details.
def setup
assert @object.respond_to?(:errors), "The model should respond to errors"
@errors = @object.errors
# This module tests the #errors object
module Errors
# Returns an Array of Strings that are the errors for the attribute in
# question. If localization is used, the Strings should be localized
# for the current locale. If no error is present, this method should
# return an empty Array.
def test_errors_aref
assert @errors[:hello].is_a?(Array), "errors#[] should return an Array"
# Returns an Array of all error messages for the object. Each message
# should contain information about the field, if applicable.
def test_errors_full_messages
assert @errors.full_messages.is_a?(Array), "errors#full_messages should return an Array"
include Errors
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