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I have the a service definition in a custom Drupal 8 module which I would like to test. I've managed to test everything else in my module with unit tests, so my whole suite runs in a fraction of a second, and I'd like to avoid introducing anything Simpletest-based. (My CI infrastructure wouldn't support it anyway.) Is there any way to test my service definition in an isolated unit test? Here's my service definition:

my_module.services.yml:

services: my_module.client: class: Drupal\my_module\Client factory: Drupal\my_module\Client::create arguments: ['@state', '@config.factory']

The manual test I've been performing is to run this Drush command:

drush ev 'var_dump(\Drupal::service("my_module.client")->_serviceId == "my_module.client" ? "PASS" : "FAIL");'

That's a sufficient smoke test while I'm developing. For a regression test, I'd also like to assert that the class returned is an instance of the correct type.

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  • Are you trying to test the service definition in the YAML file? Or are you trying to test the container code? I think these are covered by core's unit tests because it's not your module's code that is doing the instantiating. For instance ContainerTest tests setting a service in the container and YamlFileLoader comes from Syfmony and tested there. I would test the class methods itself, but it's possible to set the object into the container for a given service id and assert that it's returned via \Drupal::service().
    – mradcliffe
    Dec 4 '15 at 12:55
  • I think what I'm really after is proving that my service definition YAML causes the correct dependencies to be injected into my service class. Maybe that's an integration test by definition. Dec 5 '15 at 3:20

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