Clearing out ActionMailer::Base.deliveries after RSpec test

Solution 1:

RSpec.describe UserMailer do
  before do
    # ActionMailer::Base.deliveries is a regular array
    ActionMailer::Base.deliveries = []

    # or use ActionMailer::Base.deliveries.clear
  end

  it "sends welcome email" do
    user = create(:user)
    UserMailer.welcome_email(user).deliver_now
    expect(ActionMailer::Base.deliveries).to be_present
  end
end

Solution 2:

You can clear the deliveries after each test quite easily, adding this into your spec_helper.rb.

RSpec.configure do |config|
  config.before { ActionMailer::Base.deliveries.clear }      
end

I'd suggest reading my article about the correct emails configuration in Rails where I talk also about testing them correctly.

Solution 3:

As Andy Lindeman points out, clearing the deliveries is done automatically for mailer tests. However, for other types, simply add , :type => :mailer to the wrapping block to force the same behavior.

describe "tests that send emails", type: :mailer do
  # some tests
end