是否有用于属性确切长度的rspec测试?

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我正在尝试测试邮政编码属性的长度，以确保其5个字符长.现在，我正在测试以确保其不为空白，然后以4个字符表示太短，以6个字符表示太长.

I'm trying to test the length of a zip code attribute to ensure its 5 characters long. Right now I'm testing to make sure its not blank and then too short with 4 characters and too long with 6 characters.

有没有一种方法可以测试它是否正好是5个字符?到目前为止，我在网上或rspec书中都找不到任何东西.

Is there a way to test it being exactly 5 characters? So far I've found nothing online or in the rspec book.

推荐答案

如果要在ActiveRecord模型上测试验证，建议您尝试 shoulda-matchers .它提供了许多对Rails有用的有用的RSpec扩展.您可以为邮政编码属性编写一个简单的单行规范:

If you're testing a validation on an ActiveRecord model, I recommend trying out shoulda-matchers. It provides a bunch of useful RSpec extensions useful for Rails. You could write a simple one line spec for your zip code attribute:

describe Address do it { should ensure_length_of(:zip_code).is_equal_to(5).with_message(/invalid/) } end