openjpa-lib/src/test/java/org/apache/openjpa/lib/util/TestUUIDGenerator.java

/*
 * 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.openjpa.lib.util;

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

import junit.framework.TestCase;

/**
 * Test UUID generation.
 *
 * @author Abe White
 */
public class TestUUIDGenerator extends TestCase {

    public void testUniqueString() {
        Set seen = new HashSet();
        for (int i = 0; i < 10000; i++)
            assertTrue(seen.add(UUIDGenerator.nextString()));
    }

    public void testUniqueHex() {
        Set seen = new HashSet();
        for (int i = 0; i < 10000; i++)
            assertTrue(seen.add(UUIDGenerator.nextHex()));
    }

    public void testGetTime() {
        long time = 0;
        for (int i = 0; i < 10000; i++) {
            long newTime = UUIDGenerator.getTime();
            assertTrue(newTime != time);
            time = newTime;
        }
    }
}