blob: e702656bd1b29ac96776c78b31979591feabd22f [file] [log] [blame]
// Copyright (C) 2009 The Android Open Source Project
//
// Licensed 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 com.google.gerrit.server.util;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import com.google.gerrit.testing.GerritBaseTests;
import java.util.HashSet;
import org.junit.Test;
public class IdGeneratorTest extends GerritBaseTests {
@Test
public void test1234() {
final HashSet<Integer> seen = new HashSet<>();
for (int i = 0; i < 1 << 16; i++) {
final int e = IdGenerator.mix(i);
assertTrue("no duplicates", seen.add(e));
assertEquals("mirror image", i, IdGenerator.unmix(e));
}
assertEquals(0x801234ab, IdGenerator.unmix(IdGenerator.mix(0x801234ab)));
assertEquals(0xc0ffee12, IdGenerator.unmix(IdGenerator.mix(0xc0ffee12)));
assertEquals(0xdeadbeef, IdGenerator.unmix(IdGenerator.mix(0xdeadbeef)));
assertEquals(0x0b966b11, IdGenerator.unmix(IdGenerator.mix(0x0b966b11)));
}
}