Mocking a Function with empty parameter list in ZIO Test

Question

I have the following function I want to mock:

def deployments(): Task[Seq[Deployment]]

My envBuilder looks like:

ZLayer.fromService(invoke =>
        new processEngineService.Service {
          def deployments(): Task[Seq[Deployment]] =
            invoke(Deployments)
        }
      )

How can I set up my expectations for this?

Following the docs (GetStrLn returns value("42")) I tried:

ProcessEngineMock.Deployments returns value(Seq(deployment))

But this gives me:

- unsatisfied expectations
  in sequential order
    ..ProcessEngineMock.Deployments with arguments isUnit()

How is this done correctly?