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# frozen_string_literal: true
require "active_support/test_case"
require "rails-dom-testing"
module ActionMailer
class NonInferrableMailerError < ::StandardError
def initialize(name)
super "Unable to determine the mailer to test from #{name}. " \
"You'll need to specify it using tests YourMailer in your " \
"test case definition"
end
end
class TestCase < ActiveSupport::TestCase
module ClearTestDeliveries
extend ActiveSupport::Concern
included do
setup :clear_test_deliveries
teardown :clear_test_deliveries
end
private
def clear_test_deliveries
if ActionMailer::Base.delivery_method == :test
ActionMailer::Base.deliveries.clear
end
end
end
module Behavior
extend ActiveSupport::Concern
include ActiveSupport::Testing::ConstantLookup
include TestHelper
include Rails::Dom::Testing::Assertions::SelectorAssertions
include Rails::Dom::Testing::Assertions::DomAssertions
included do
class_attribute :_mailer_class
setup :initialize_test_deliveries
setup :set_expected_mail
teardown :restore_test_deliveries
ActiveSupport.run_load_hooks(:action_mailer_test_case, self)
end
module ClassMethods
def tests(mailer)
case mailer
when String, Symbol
self._mailer_class = mailer.to_s.camelize.constantize
when Module
self._mailer_class = mailer
else
raise NonInferrableMailerError.new(mailer)
end
end
def mailer_class
if mailer = _mailer_class
mailer
else
tests determine_default_mailer(name)
end
end
def determine_default_mailer(name)
mailer = determine_constant_from_test_name(name) do |constant|
Class === constant && constant < ActionMailer::Base
end
raise NonInferrableMailerError.new(name) if mailer.nil?
mailer
end
end
private
def initialize_test_deliveries
set_delivery_method :test
@old_perform_deliveries = ActionMailer::Base.perform_deliveries
ActionMailer::Base.perform_deliveries = true
ActionMailer::Base.deliveries.clear
end
def restore_test_deliveries
restore_delivery_method
ActionMailer::Base.perform_deliveries = @old_perform_deliveries
end
def set_delivery_method(method)
@old_delivery_method = ActionMailer::Base.delivery_method
ActionMailer::Base.delivery_method = method
end
def restore_delivery_method
ActionMailer::Base.deliveries.clear
ActionMailer::Base.delivery_method = @old_delivery_method
end
def set_expected_mail
@expected = Mail.new
@expected.content_type ["text", "plain", { "charset" => charset }]
@expected.mime_version = "1.0"
end
def charset
"UTF-8"
end
def encode(subject)
Mail::Encodings.q_value_encode(subject, charset)
end
def read_fixture(action)
IO.readlines(File.join(Rails.root, "test", "fixtures", self.class.mailer_class.name.underscore, action))
end
end
include Behavior
end
end
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