private Random random = new Random();
public static final ArrayList<Double> list = new ArrayList<Double>(1000000);

@Test
public void givenStaticField_whenLotsOfOperations_thenMemoryLeak() throws InterruptedException {
   // We will only use list in this method.
    for (int i = 0; i < 1000000; i++) {
        list.add(random.nextDouble());
    }

    System.gc();
    Thread.sleep(10000); // to allow GC do its job
}