Drupal's Settings class is marked final and has no interface, meaning traditional PHPUnit mocking techniques will not work out of the box. Is it necessary to install third-party tools to be able to mock this or is there another way?


At first glance Settings appears to be read-only, however the constructor is quite forgiving in its parameters. We can construct a fake settings structure like so:

$site_settings = [
  'http_services_api' => [
    'auth_services' => [
      'title' => 'Auth Services',
      'config' => [
        'base_uri' => 'https://demo.api-platform.com/auth'
    'resource_services' => [
      'title' => 'Resource Services',
      'config' => [
        'base_uri' => 'https://demo.api-platform.com/books'

new Settings($site_settings);

This is alluded too here but never fully described.

Edit: I have added an example to the docs linked.

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