test.rb

require 'test_helper'

class SubscriptionNotifierTest < ActionMailer::TestCase
  fixtures :companies

  should_eventually "test other subscription mailer actions"

  test 'should send cancellation email' do
    company = companies(:no_categories)
    email = SubscriptionNotifier.cancelled_subscription(company).deliver
    assert_contains email.to, 'something@somethingelse.com'
    assert_equal "Cancelled Subscription", email.subject
    assert_match /#{company.organization} subscription has been cancelled/, email.body
  end
end

# raises TypeError: can't convert Mail::Body to String