Set action_mailer.default_url_options and routes.default_url_options in Rails test environment

Question

I've seen a lot of questions about errors concerning action_mailer.default_url_options and default_url_options[:host] during system tests.

Below I share a good solution I found.

broiling-clamshell · Accepted Answer · 2025-05-02 02:50:56Z

0

In the file test/application_system_test_case.rb, append the following inside the setup block:

setup do
    host = Capybara.current_session.server.host
    port = Capybara.current_session.server.port
    Rails.application.config.action_mailer.default_url_options = { host: host, port: port }
    Rails.application.routes.default_url_options[:host] = host
end

This will make action_mailer.default_url_options and routes.default_url_options equal to whatever host and ports the tests had generated.

I think it's a better solution than hardcoding the values inside the environment files.

answered May 2 at 2:50

broiling-clamshell

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