bamboo

v1.0.0-rc.1

bamboo v1.0.0-rc.1 Bamboo.Test

Helpers for testing email delivery

Use these helpers with Bamboo.TestAdapter to test email delivery. Typically you’ll want to unit test emails first. Then in integration tests use helpers from this module to test whether that email was delivered.

Note on sending from other processes

If you are sending emails from another process (for example, from inside a Task or GenServer) you may need to use shared mode when using Bamboo.Test. See the docs __using__/1 for an example.

For most scenarios you will not need shared mode.

In your config 

# Typically in config/test.exs
config :my_app, MyApp.Mailer,
  adapter: Bamboo.TestAdapter

Unit test

You don’t need any special functions to unit test emails.

defmodule MyApp.EmailTest do
  use ExUnit.Case

  test "welcome email" do
    user = %User{name: "John", email: "person@example.com"}

    email = MyApp.Email.welcome_email(user)

    assert email.to == user
    assert email.subject == "This is your welcome email"
    assert email.html_body =~ "Welcome to the app"
  end
end

Integration test 

defmodule MyApp.Email do
  import Bamboo.Email

  def welcome_email(user) do
    new_email(
      from: "me@app.com",
      to: user,
      subject: "Welcome!",
      text_body: "Welcome to the app",
      html_body: "<strong>Welcome to the app</strong>"
    )
  end
end

defmodule MyApp.EmailDeliveryTest do
  use ExUnit.Case
  use Bamboo.Test

  test "sends welcome email" do
    user = %User{...}
    email = MyApp.Email.welcome_email(user)

    email |> MyApp.Mailer.deliver_now

    # Works with deliver_now and deliver_later
    assert_delivered_email email
  end
end

Summary

Functions

assert_no_emails_delivered()

Checks that no emails were sent

refute_delivered_email(email)

Ensures a particular email was not sent

Macros

__using__(arg1)

Imports Bamboo.Test and Bamboo.Formatter.format_email_address/2

assert_delivered_email(email)

Checks whether an email was delivered

assert_email_delivered_with(email_params)

Check whether an email’s params are equal to the ones provided

Functions

assert_no_emails_delivered()

Checks that no emails were sent.

If Bamboo.Test is used with shared mode, you must also configure a timeout in your test config.

# Set this in your config, typically in config/test.exs
config :bamboo, :refute_timeout, 10

The value you set is up to you. Lower values will result in faster tests, but may incorrectly pass if an email is delivered after the timeout. Often times 1ms is enough.

refute_delivered_email(email)

Ensures a particular email was not sent

Same as assert_delivered_email/0, except it checks that a particular email was not sent.

If Bamboo.Test is used with shared mode, you must also configure a timeout in your test config.

# Set this in your config, typically in config/test.exs
config :bamboo, :refute_timeout, 10

The value you set is up to you. Lower values will result in faster tests, but may incorrectly pass if an email is delivered after the timeout. Often times 1ms is enough.

Macros

__using__(arg1)

Imports Bamboo.Test and Bamboo.Formatter.format_email_address/2

Bamboo.Test and the Bamboo.TestAdapter work by sending a message to the current process when an email is delivered. The process mailbox is then checked when using the assertion helpers like assert_delivered_email/1.

Sometimes emails don’t show up when asserting because you may deliver an email from a different process than the test process. When that happens, turn on shared mode. This will tell Bamboo.TestAdapter to always send to the test process. This means that you cannot use shared mode with async tests.

Try to use this version first 

use Bamboo.Test

And if you are delivering from another process, set shared: true 

use Bamboo.Test, shared: true

Common scenarios for delivering mail from a different process are when you send from inside of a Task, GenServer, or are running acceptance tests with a headless browser like phantomjs.

assert_delivered_email(email)

Checks whether an email was delivered.

Must be used with the Bamboo.TestAdapter or this will never pass. In case you are delivering from another process, the assertion waits up to 100ms before failing. Typically if an email is successfully delivered the assertion will pass instantly, so test suites will remain fast.

Examples 

email = Bamboo.Email.new_email(subject: "something")
email |> MyApp.Mailer.deliver
assert_delivered_email(email) # Will pass

unsent_email = Bamboo.Email.new_email(subject: "something else")
assert_delivered_email(unsent_email) # Will fail
assert_email_delivered_with(email_params)

Check whether an email’s params are equal to the ones provided.

Must be used with the Bamboo.TestAdapter or this will never pass. In case you are delivering from another process, the assertion waits up to 100ms before failing. Typically if an email is successfully delivered the assertion will pass instantly, so test suites will remain fast.

Examples 

email = Bamboo.Email.new_email(subject: "something")
email |> MyApp.Mailer.deliver
assert_email_delivered_with(subject: "something") # Will pass

unsent_email = Bamboo.Email.new_email(subject: "something else")
assert_email_delivered_with(subject: "something else") # Will fail

You can also pass a regex to match portions of an email.

Example 

email = new_email(text_body: "I love coffee")
assert_email_delivered_with(email, text_body: ~r/love/) # Will pass
assert_email_delivered_with(email, text_body: ~r/like/) # Will fail