Veerasundaravel's Ruby on Rails Weblog

July 25, 2012

Rspec Shoulda-Matcher made Unit testing as easier one

Filed under: Rails3, Ruby, Ruby On Rails, Testing, Unit Test — Tags: , , , , , , — Veerasundaravel @ 12:37 am

Shoulda matcher is a library that enables to write better and more understandable tests for Rails application. It is Test::Unit- and RSpec-compatible one-liners that test common Rails functionality.

Here few very easier example of shoulda-matchers for Unit Testing.

Test model fields:

it {should have_db_column(:login)}
it {should have_db_column(:salary).of_type(:decimal).with_options(:precision => 10, :scale => 2) }
it { should_not have_db_column(:admin).of_type(:boolean) }

Test db indexes:

it { should have_db_index(:age) }
it { should have_db_index([:commentable_type, :commentable_id]) }
it { should have_db_index(:ssn).unique(true) }

Test validations:

it { should validate_uniqueness_of(:title) }
it { should validate_presence_of(:body).with_message(/Enter the message/) }
it { should validate_presence_of(:title) }
it { should validate_numericality_of(:user_id) }
it { should validate_uniqueness_of(:title) }
it { should_not allow_value("blah").for(:email) }
it { should allow_value("a@b.com").for(:email) }
it { should ensure_inclusion_of(:age).in_range(1..100) }
it { should_not allow_mass_assignment_of(:password) }

Test associations:

it { should belong_to(:parent) }
it { should have_one(:car)
it { should have_many(:friends) }
it { should have_many(:enemies).through(:friends) }

 

Further reading:

Shoulda-Matcher home page –  https://github.com/thoughtbot/shoulda-matchers/
Shoulda-context home page – https://github.com/thoughtbot/shoulda-context/
rspec_shoulda cheat sheet – http://cheat.errtheblog.com/s/rspec_shoulda/

 

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