/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.paimon.utils;

import org.junit.jupiter.api.Test;

import java.util.HashSet;
import java.util.Random;
import java.util.Set;

import static org.assertj.core.api.Assertions.assertThat;

/** Test for {@link IntHashSet}. */
public class IntHashSetTest {

    @Test
    public void testRandom() {
        Set<Integer> values = new HashSet<>();
        Random rnd = new Random();
        for (int i = 0; i < rnd.nextInt(100); i++) {
            values.add(rnd.nextInt());
        }
        if (rnd.nextBoolean()) {
            values.add(0);
            values.add(-1);
            values.add(1);
            values.add(Integer.MAX_VALUE);
        }

        IntHashSet set = new IntHashSet();
        for (Integer i : values) {
            boolean add = set.add(i);
            assertThat(add).isTrue();
        }
        for (Integer i : values) {
            boolean add = set.add(i);
            assertThat(add).isFalse();
        }

        int[] expected = values.stream().mapToInt(Integer::intValue).sorted().toArray();
        assertThat(set.toInts()).containsExactlyInAnyOrder(expected);
    }
}
