Effectively Use Rails 5 Validation Methods

This chapter is from the book

The Rails 5 Way, 4th Edition

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This chapter is from the book

This chapter is from the book 

The Rails 5 Way, 4th Edition

Learn More Buy

8.9 Testing Validations with Shoulda

Even though validations are declarative code, if you’re doing TDD then you’ll want to specify them before writing them. Luckily, Thoughtbot’s Shoulda Matchers library³ contains a number of matchers designed to easily test validations.

describe Post do
  it { should validate_uniqueness_of(:title) }
  it { should validate_presence_of(:body).with_message(/wtf/) }
  it { should validate_presence_of(:title) }
  it { should validate_numericality_of(:user_id) }
end

describe User do
  it { should_not allow_value("blah").for(:email) }
  it { should_not allow_value("b lah").for(:email) }
  it { should allow_value("a@b.com").for(:email) }
  it { should allow_value("asdf@asdf.com").for(:email) }
  it { should ensure_length_of(:email).is_at_least(1).is_at_most(100) }
  it { should ensure_inclusion_of(:age).in_range(1..100) }
end