Rspec / shoulda: testing, that a custom validator is called

Question

I have a custom validator (located in app/validators/uri_validator.rb) which is used in:

validates :link, uri: true

How do I specify this in my specs?

Ideally I would like to have a one-line call, such as:

it { should validate_uri_of(:link) }

How do I do this?

score 3 · Answer 1 · answered Jun 12 '12 at 13:30

3

Use factory girl to build a model object with invalid data and one with valid data and call the be_valid matcher.

#factory girl
build(:model, link: valid_uri).should be_valid
build(:model, link: invalid_uri).should_not be_valid

answered Jun 12 '12 at 13:30

DVG

I try not to hit the database during testing when it is possible. – krn Jun 12 '12 at 14:13
3

Using factory girl with `build` does not hit the database, it creates an unsaved model. – nmott Jun 25 '12 at 13:25

score 3 · Accepted Answer · answered Jun 25 '12 at 13:27

3

Another option is to use the allow_value matcher, although not ideal it can work in some circumstances.

it { should allow_value(value_which_is_valid).for(:link) }
it { should_not allow_value(value_which_is_invalid).for(:link) }

answered Jun 25 '12 at 13:27

nmott

2 Answers2