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rails--rails/railties/test/application/integration_test_case_test.rb

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require 'isolation/abstract_unit'
module ApplicationTests
class IntegrationTestCaseTest < ActiveSupport::TestCase
include ActiveSupport::Testing::Isolation
setup do
build_app
boot_rails
end
teardown do
teardown_app
end
test "resets Action Mailer test deliveries" do
script('generate mailer BaseMailer welcome')
app_file 'test/integration/mailer_integration_test.rb', <<-RUBY
require 'test_helper'
class MailerIntegrationTest < ActionDispatch::IntegrationTest
setup do
@old_delivery_method = ActionMailer::Base.delivery_method
ActionMailer::Base.delivery_method = :test
end
teardown do
ActionMailer::Base.delivery_method = @old_delivery_method
end
2.times do |i|
define_method "test_resets_deliveries_\#{i}" do
BaseMailer.welcome.deliver_now
assert_equal 1, ActionMailer::Base.deliveries.count
end
end
end
RUBY
output = Dir.chdir(app_path) { `bin/rails test 2>&1` }
assert_equal 0, $?.to_i, output
assert_match(/0 failures, 0 errors/, output)
end
end
end