given:
        settingsFile << """
            rootProject.name = 'somelib'
        """
        buildFile << """
            plugins { id 'java' }

            sourceSets.main.java.srcDir("src/common/java")
        """
        file("src/common/java/OtherThing.java") << """
            class OtherThing {
            }
        """
        file("src/main/java/Thing.java") << """

    if [[ -n "${GCP_AUTHN_CACHE_TTL:-}" ]]; then
      params+=" --authentication-token-webhook-cache-ttl=${GCP_AUTHN_CACHE_TTL}"
    fi
  fi

  local authorization_mode="RBAC"
  local -r src_dir="${KUBE_HOME}/kube-manifests/kubernetes/gci-trusty"

  # Enable ABAC mode unless the user explicitly opts out with ENABLE_LEGACY_ABAC=false
  if [[ "${ENABLE_LEGACY_ABAC:-}" != "false" ]]; then

        buildFile """
            def fileCollection = objects.fileCollection()
            def sourceDirs = objects.sourceDirectorySet('main', 'main files')
            sourceDirs.srcDirs("dir1", "dir2")
            fileCollection.from(sourceDirs.srcDirTrees)
            println("files = \${fileCollection.files.name.sort()}")
        """

        given:
        file("dir1/file1").createFile()