bamboo v2.0.0

Bamboo.Test (bamboo v2.0.0) View Source

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

Link to this section Summary

Functions

__using__(arg1)

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

assert_delivered_email(email)

Checks whether an email was delivered.

assert_delivered_email_matches(email_pattern)

Checks whether an email was delivered matching the given pattern.

assert_email_delivered_with(email_params)

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

assert_no_emails_delivered()

Checks that no emails were sent.

refute_delivered_email(email)

Ensures a particular email was not sent

refute_email_delivered_with(email_params)

Check that no email was sent with the given parameters

Link to this section Functions

Link to this macro

__using__(arg1)

View Source (macro)

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.

Link to this macro

assert_delivered_email(email)

View Source (macro)

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
Link to this macro

assert_delivered_email_matches(email_pattern)

View Source (macro)

Checks whether an email was delivered matching the given pattern.

Must be used with the Bamboo.TestAdapter or this will never pass. This allows the user to use their configured assert_receive_timeout for ExUnit, and also to match any variables in their given pattern for use in further assertions.

Examples 

%{email: user_email, name: user_name} = user
MyApp.deliver_welcome_email(user)
assert_delivered_email_matches(%{to: [{_, ^user_email}], text_body: text_body})
assert text_body =~ "Welcome to MyApp, #{user_name}"
assert text_body =~ "You can sign up at https://my_app.com/users/#{user_name}"
Link to this macro

assert_email_delivered_with(email_params)

View Source (macro)

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

The function will use the Bamboo Formatter when checking email addresses.

email = Bamboo.Email.new_email(to: "someone@example.com")
email |> MyApp.Mailer.deliver
assert_email_delivered_with(to: "someone@example.com") # Will pass

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

Example 

email = new_email(text_body: "I love coffee")
email |> MyApp.Mailer.deliver
assert_email_delivered_with(text_body: ~r/love/) # Will pass
assert_email_delivered_with(text_body: ~r/like/) # Will fail
Link to this function

assert_no_emails_delivered()

View Source

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.

Link to this function

refute_delivered_email(email)

View Source

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.

Link to this macro

refute_email_delivered_with(email_params)

View Source (macro)

Check that no email was sent with the given parameters

Similarly to assert_email_delivered_with, the assertion waits up to 100ms before failing. Note that you need to send the email again if you want to make other assertions after this, as this will receive the {:delivered_email, email} message.

Examples 

Bamboo.Email.new_email(subject: "something") |> MyApp.Mailer.deliver
refute_email_delivered_with(subject: "something else") # Will pass

email = Bamboo.Email.new_email(subject: "something") |> MyApp.Mailer.deliver
refute_email_delivered_with(subject: ~r/some/) # Will fail