Using a random open port for tests in Micronaut

By default if the configuration property micronaut.server.port is not specified a Micronaut application will run on port 8080 and tests will run on a random port. If however you specify a port for the application to run on, your tests will also run on that port.

For tests to run on a random port again you need to set micronaut.server.port to either -1 or ${random.port} in your application-test.yml config file. ${random.port} is one of Micronaut’s random properties. Random properties can be used to set random values for configuration properties.

An example project using Micronaut 2.0.1 can be found on github.