RoR: Minitest error: Expected false to be truthy

Question

寻求帮助使用 minitest 实施简单的首次测试（Rails 5，Ruby 2.7.0）

car_test.rb

require 'test_helper'

class CarTest < ActiveSupport::TestCase

  test 'valid car' do
    car = Car.new(title: 'SALOON', style: '1')
    assert car.valid?
  end

end

我的模型car.rb

class Car < ApplicationRecord
    validates :title, :style, presence: true
end

当我运行测试时：rake test TEST=test/models/car_test.rb

Expected false to be truthy.

我不知道我做错了什么？谢谢

Answer 1

assert thing.valid? 是一种测试反模式，由 Rails 教程书推广。这是一种反模式，因为您要同时测试每一个验证，并且误报和漏报的可能性都很大。错误消息也完全没有告诉您测试失败的原因。

相反，如果您想测试验证，请使用 errors object。

require 'test_helper'

class CarTest < ActiveSupport::TestCase
  test 'title must be present' do
    car = Car.new(title: '')
    car.valid?
    assert_includes car.errors.messages[:title], "can't be blank"
  end
  test 'style must be present' do
    car = Car.new(style: '')
    car.valid?
    assert_includes car.errors.messages[:style], "can't be blank"
  end
end

RoR: Minitest error: Expected false to be truthy

RoR: Minitest error: Expected false to be truthy

ruby-on-rails

minitest