Run Server when Integration Testing with Gradle

I've developed a client-server-architecture using Kryonet and Gradle with roughly the following structure

• Parent project X, containing projects A and B
• Project A (server)
• Project B (client), containing integration and unit test classes

Now whenever I'm running the goal 'integrationTest' on project B (or project X, if that was easier), I'd like the server to get started in advance so that the integration tests won't fail.

This is what I've got so far in the build.gradle of project B - it doesn't run the server, though:

task integrationTest(type: Test) {
    testClassesDir = sourceSets.integrationTest.output.classesDir
    classpath = sourceSets.integrationTest.runtimeClasspath
    outputs.upToDateWhen { false }
}