A collection of matchers for RSpec, MiniTest and Cucumber steps to make testing emails go smoothly.

This library works with ActionMailer and Pony. When using it with ActionMailer it works with ActiveRecord Mailer, and action_mailer_cache_delivery.

If you are testing emails in conjunction with an automated browser solution, like Selenium, you will want to use action_mailer_cache_delivery in your test environment. (This is because your test process and server processes are distinct and therefore need an intermediate store for the emails.) ActiveRecord Mailer will also work but you generally don't want to include those projects unless you need them in production.

# Gemfile
group :test do
  gem 'email_spec'
end

To use the steps in features put the following in your env.rb:

# Make sure this require is after you require cucumber/rails/world.
require 'email_spec' # add this line if you use spork
require 'email_spec/cucumber'

This will load all the helpers that the steps rely on. It will also add a Before hook for Cucumber so that emails are cleared at the start of each scenario.

Then:

rails generate email_spec:steps

This will give you a bunch of steps to get started with in step_definitions/email_steps.rb

By default, the generated file will look for email to example@example.com. You can either change this by editing the current_email_address method in email_steps.rb, or by simply specifying the target email in your features:

Scenario: A new person signs up
    Given I am at "/"
    When I fill in "Email" with "quentin@example.com"
    And I press "Sign up"
    Then "quentin@example.com" should receive an email   # Specify who should receive the email

To use the helpers and matchers in your Spinach steps, add this to your env.rb:

require 'email_spec/spinach'

Creating shared steps (as for Cucumber above) doesn't fit so well with the Spinach ethos of very compartmentalized steps, so there is no generator for Spinach. It's easy to use the helpers/matchers in your steps. For example:

step 'the last email sent should welcome the user' do
  expect(last_email_sent).to have_subject('Welcome')
end

First you need to require email_spec in your spec_helper.rb:

require "email_spec"
require "email_spec/rspec"

This will load all the helpers that the scenarios can count on. It will also add a before(:each) hook so that emails are cleared at the start of each scenario.

If you are upgrading to Rails 5, make sure your rails_helper.rb requires spec_helper after loading the environment. For example:

require File.expand_path('../../config/environment', __FILE__)
require 'spec_helper'

First you need to require minitest-matchers and email_spec in your test_helper.rb:

require "minitest-matchers"
require "email_spec"

You will then need to include EmailSpec::Helpers and EmailSpec::Matchers in your test classes. If you want to have access to the helpers and matchers in all of your tests you can do the following in your test_helper.rb:

class MiniTest::Unit::TestCase
  include EmailSpec::Helpers
  include EmailSpec::Matchers
end

Otherwise, you will need to include them in the tests where you use them:

class SignupMailerTest < MiniTest::Unit::TestCase
  include EmailSpec::Helpers
  include EmailSpec::Matchers
  ...
end

Or, if you are using the MiniTest spec DSL, it would look like this:

describe SignupMailer do
  include EmailSpec::Helpers
  include EmailSpec::Matchers
  ...
end

If you're using Turnip, you might be interested in this conversion of the Cucumber steps into Turnip steps.

If you are using a background job, you might need to use a step to process the jobs. Another alternative is to use an inline statement for your scenario.

For example, for DelayedJob:

Delayed::Worker.delay_jobs = false

Scenario: A new person signs up
    Given I am at "/"
    When I fill in "Email" with "quentin@example.com"
    And I press "Sign up"
    And I should receive an email
    When I open the email
    Then I should see "confirm" in the email body
    When I follow "confirm" in the email
    Then I should see "Confirm your new account"

For more examples, check out examples/rails_root in the source for a small example app that implements these steps.

See RSpec Matchers (they are the same)

It is often useful to test your mailers in isolation. You can accomplish this by using mocks to verify that the mailer is being called in the correct place and then write focused examples for the actual mailer. This is a simple example from the sample app found in the gem:

Verify that the mailer is used correctly in the controller (this would apply to a model as well):

describe "POST /signup (#signup)" do
  it "should deliver the signup email" do
    # expect
    expect(UserMailer).to(receive(:deliver_signup).with("email@example.com", "Jimmy Bean"))
    # when
    post :signup, "Email" => "email@example.com", "Name" => "Jimmy Bean"
  end
end

Examples for the #signup method in UserMailer:

describe "Signup Email" do
  include EmailSpec::Helpers
  include EmailSpec::Matchers
  # include ActionController::UrlWriter - old rails
  include Rails.application.routes.url_helpers

  before(:all) do
    @email = UserMailer.create_signup("jojo@yahoo.com", "Jojo Binks")
  end

  it "should be set to be delivered to the email passed in" do
    expect(@email).to deliver_to("jojo@yahoo.com")
  end

  it "should contain the user's message in the mail body" do
    expect(@email).to have_body_text(/Jojo Binks/)
  end

  it "should contain a link to the confirmation link" do
    expect(@email).to have_body_text(/#{confirm_account_url}/)
  end

  it "should have the correct subject" do
    expect(@email).to have_subject(/Account confirmation/)
  end

end

alias: have_reply_to

This checks that the Reply-To header's email address (the bob@example.com of "Bob Saget bob@example.com") is set to the given string.

email = UserMailer.create_signup("jojo@yahoo.com", "Jojo Binks")
expect(email).to reply_to("support@myapp.com")

alias: be_delivered_to

This checks that the To header's email addresses (the bob@example.com of "Bob Saget bob@example.com") are set to the addresses.

email = UserMailer.create_signup("jojo@yahoo.com", "Jojo Binks")
expect(email).to deliver_to("jojo@yahoo.com")

alias: be_delivered_from

This checks that the From header's email address (the bob@example.com of "Bob Saget bob@example.com") is set to the given string.

email = UserMailer.create_signup("jojo@yahoo.com", "Jojo Binks")
expect(email).to deliver_from("sally@yahoo.com")

This checks that the BCC header's email addresses (the bob@example.com of "Bob Saget bob@example.com") are set to the addresses.

email = UserMailer.create_signup("jojo@yahoo.com", "Jojo Binks")
expect(email).to bcc_to("sue@yahoo.com", "bill@yahoo.com")

This checks that the CC header's email addresses (the bob@example.com of "Bob Saget bob@example.com") are set to the addresses.

email = UserMailer.create_signup("jojo@yahoo.com", "Jojo Binks")
expect(email).to cc_to("sue@yahoo.com", "bill@yahoo.com")

This checks that the Subject header's value is set to the given subject.

email = UserMailer.create_signup("jojo@yahoo.com", "Jojo Binks")
expect(email).to have_subject("Welcome!")

Note: subject can be either a String or a Regexp

This checks that one of the given emails' subjects includes the subject.

email = UserMailer.create_signup("jojo@yahoo.com", "Jojo Binks")
email2 = UserMailer.forgot_password("jojo@yahoo.com", "Jojo Binks")
expect([email, email2]).to include_email_with_subject("Welcome!")

Note: text can be either a String or a Regexp

This checks that the text of the body has the given body.

email = UserMailer.create_signup("jojo@yahoo.com", "Jojo Binks")
expect(email).to have_body_text(/Hi Jojo Binks,/)

You can specify which part in multipart to check with in_html_part or in_text_part.

email = UserMailer.("jojo@yahoo.com", "Jojo Binks")
expect(email).to have_body_text(/This is html/).in_html_part
expect(email).to have_body_text(/This is text/).in_text_part

This checks that the expected key/value pair is in the headers of the email.

email = UserMailer.create_signup("jojo@yahoo.com", "Jojo Binks")
expect(email).to have_header("X-Campaign", "1234abc")

Don't. :) Seriously, if you do just take a look at the helpers and use them as you wish.

You will use EmailSpec in your tests the same way you use it in your specs. The only difference is the use of MiniTest's must instead of Rspec's should:

email = UserMailer.create_signup("jojo@yahoo.com", "Jojo Binks")
email.must deliver_to("jojo@yahoo.com")

Or, you can use the matcher as an expectation:

email = UserMailer.create_signup "jojo@yahoo.com", "Jojo Binks"
email.must_deliver_to "jojo@yahoo.com"

And of course you can use the matcher as an assertion:

email = UserMailer.create_signup "jojo@yahoo.com", "Jojo Binks"
assert_must deliver_to("jojo@yahoo.com"), email

You can contribute by triaging issues which may include reproducing bug reports or asking for vital information, such as version numbers or reproduction instructions. If you would like to start triaging issues, one easy way to get started is to subscribe to email-spec on CodeTriage.

Ben Mabey, Aaron Gibralter, Mischa Fierer

Please see Changelog.md for upcoming changes and other contributors.