UUIDTest.java

/*
 * Copyright 2016 JBoss, by Red Hat, Inc
 *
 * 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.
 */

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package org.uberfire.commons.uuid;

import org.junit.Test;

import static org.junit.Assert.*;

public class UUIDTest {

    @Test
    public void hasFiveGroups() throws
            Exception {
        final String uuid = UUID.uuid();
        final String[] split = uuid.split("-");
        assertEquals(5,
                     split.length);
    }

    @Test
    public void generateWithGivenLength() throws
            Exception {
        assertEquals(12,
                     UUID.uuid(12)
                             .length());
        assertEquals(6,
                     UUID.uuid(6)
                             .length());
        assertEquals(100,
                     UUID.uuid(100)
                             .length());
    }

    @Test(expected = IllegalArgumentException.class)
    public void tooLongRadix() throws
            Exception {
        UUID.uuid(10,
                  63);
    }

    @Test
    public void generateWithGivenLengthAndRadix() throws
            Exception {
        assertOnlyContainsCharacters(UUID.uuid(10,
                                               2),
                                     "0",
                                     "1");
    }

    private void assertOnlyContainsCharacters(final String uuid,
                                              final String... chars) {

        String tmp = uuid;
        for (final String aChar : chars) {
            tmp = tmp.replaceAll(aChar,
                                 "");
        }

        assertTrue("Found illegal characters: " + tmp,
                   tmp.isEmpty());
    }
}