How to run a single test from a rails test suite?

ruby-on-rails unit-testing rake
artemave picture artemave · Oct 2, 2009 · Viewed 73.6k times · Source

How can I run a single test from a rails test suite?

rake test ANYTHING seems to not help.

Answer

Darryl picture Darryl · Oct 2, 2009

NOTE: This doesn't run the test via rake. So any code you have in Rakefile will NOT get executed.

To run a single test, use the following command from your rails project's main directory:

ruby -I test test/unit/my_model_test.rb -n test_name

This runs a single test named "name", defined in the MyModelTest class in the specified file. The test_name is formed by taking the test name, prepending it with the word "test", then separating the words with underscores. For example:

class MyModelTest < ActiveSupport::TestCase

  test "valid with good attributes" do
    # do whatever you do
  end

  test "invalid with bad attributes" do
    # do whatever you do
  end
end

You can run both tests via:

ruby -I test test/unit/my_model_test.rb

and just the second test via 

ruby -I test test/unit/my_model_test.rb -n test_invalid_with_bad_attributes

Related questions

Rails - How do you test ActionMailer sent a specific email in tests

Currently in my tests I do something like this to test if an email is queued to be sent assert_difference('ActionMailer::Base.deliveries.size', 1) do get :create_from_spreedly, {:user_id => @logged_in_user.id} end but if …

Read More
RSpec: What is the difference between let and a before block?

What is difference between let and a before block in RSpec? And when to use each? What will be good approach (let or before) in below example? let(:user) { User.make !} let(:account) {user.account.make!} before(:each) do @user = …

Read More
RSpec controller testing - blank response.body

I am stuck with a problem when testing my controllers with RSpec - the response.body call always returns an empty string. In browser everything renders correctly, and cucumber feature tests seem to get it right, but RSpec fails each …

Read More