*/
    assertWithMessage(
            "Can't test the main listenInPoolThread path "
                + "if the input is already a ListenableFuture")
        .that(input)
        .isNotInstanceOf(ListenableFuture.class);
    ListenableFuture<String> listenable = listenInPoolThread(input);
    /*
     * This will occur before the waiting get() in the
     * listenInPoolThread-spawned thread completes:
     */

     */
    assertWithMessage(
            "Can't test the main listenInPoolThread path "
                + "if the input is already a ListenableFuture")
        .that(input)
        .isNotInstanceOf(ListenableFuture.class);
    ListenableFuture<String> listenable = listenInPoolThread(input);
    /*
     * This will occur before the waiting get() in the
     * listenInPoolThread-spawned thread completes:
     */