Lagom Version

Current (1.6.4)

API (Scala / Java / Neither / Both)

Scala (TestKit)

Expected Behavior

I am integrating Lagom integration tests with Optic which requires that the Lagom service start on a specific port (which Optic provides). Therefore I need to be able to specify the port on which a Lagom application will start up when TestServer.startServer is invoked.

Actual Behavior

The port is hard-coded in ServerConfig to Some(0), which means the service will always start on a dynamically assigned port.

https://github.com/lagom/lagom/blob/master/testkit/scaladsl/src/main/scala/com/lightbend/lagom/scaladsl/testkit/ServiceTest.scala#L330

I propose that instead we allow the user to specify a port as part of the Setup configuration. Ideally, the user should have control of all ports (http, https, and any dependent services which are started, such as Cassandra/JDBC).

See also #1584