@Test
public void testContains() {

    int count = TestData.getScaleCount() * TestData.getScaleCount();
    Set<Long> longs = Sets.newHashSet();
    while (longs.size() < count) {
        longs.add(TestData.getLong());
    }
    for (long l : longs) {
        Assert.assertFalse(inventory.contains(l));
        inventory.add(l);
        Assert.assertTrue(inventory.contains(l));
    }
}