protected ArtifactBuilder artifactBuilder() {
   InProcessGradleExecuter gradleExecuter = new InProcessGradleExecuter();
   gradleExecuter.withUserHomeDir(distribution.getUserHomeDir());
   return new GradleBackedArtifactBuilder(gradleExecuter, getTestDir().file("artifacts"));
 }
 public TestFile getTestDir() {
   return distribution.getTestDir();
 }