btree = new BTree(tmpFile, true /* duplicateAllowed */);
        Assert.assertTrue(btree.open());
        btree.addValue(createValue("e"), 5);
        btree.addValue(createValue("b"), 7);
        IndexQuery query = new BasicIndexQuery(BasicIndexQuery.EQ, createValue("b"));
        Callback callback = new Callback();
        btree.search(query, callback);
        List<Long> actual = callback.getPointers();
        Assert.assertEquals(2, actual.size());
        Assert.assertEquals(new Long(2), actual.get(0));