如何使用devise，rspec，capybara和mailspec测试dev邮件传递

Question

I'm trying to test if devise is sending out confirmation emails. This is becomming to be a bit of a challenge to me because, the tests use a different environment in Rails and I'm not quite sure if I'm going the right route. Here's my rspec test.

describe "Sign up:", :type => :feature do

  before(:each) do
    @user = FactoryGirl.build(:user)

    visit root_path

    click_link "Sign Up"

    fill_in "Name", :with => @user.name
    fill_in "Email", :with => @user.email
    fill_in "Password", :with => @user.password
    fill_in "Password confirmation", :with => @user.password

    click_button "Sign up"
end

describe "user gets a confirmation email" do
 subject { ActionMailer::Base.deliveries.last }
 it { is_expected.to deliver_to(@user.email) }
end

This is the message when I run the spec.

 Failure/Error: it { is_expected.to deliver_to(@user.email) }
 NoMethodError:
   undefined method `perform_deliveries' for nil:NilClass

I would like to test this feature, but can Rails send out emails in a test environment? If so what kind of code makes this type of code pass? I have the mailer set up to sendgrid, so I can show that as well. User's of Devise are set to confirmable, so a confirmation email is supposed to be coming out.

Answer 1

Make sure you have this set in your you have this set in config/environments/test.rb :

config.action_mailer.delivery_method = :test

In your spec, you can also just test that ActionMailer::Base.deliveries has changed:

describe "Sign up:", :type => :feature do
  # ...

  it "sends a confirmation email" do
    expect {
      click_button "Sign up"

      # for example. the point is to wait for the AJAX response
      page.find('p.thanks', text: 'Thanks for signing up')
    }.to change { ActionMailer::Base.deliveries.size }.by(1)
  end
end

Similarly, if you're using Sidekiq, you can instead check that the number of Sidekiq jobs went up.

Personally, I'd save testing the specifics of the email for a unit test, and use the feature test to make sure that everything's wired together.

Also, if you want to verify manually that the emails are getting sent, Mailcatcher is pretty nice.

Answer 2

You could try to write in test environment:

config.action_mailer.perform_deliveries = true 

I hope it will help You!