libraries/uid/src/test/java/org/apache/zest/library/uid/uuid/UuidServiceTest.java

/*
 * Copyright 2008 Niclas Hedhman. All rights Reserved.
 *
 * 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 org.apache.zest.library.uid.uuid;

import org.junit.Test;
import org.apache.zest.api.composite.TransientComposite;
import org.apache.zest.api.injection.scope.Service;
import org.apache.zest.api.mixin.Mixins;
import org.apache.zest.bootstrap.AssemblyException;
import org.apache.zest.bootstrap.ModuleAssembly;
import org.apache.zest.library.uid.uuid.assembly.UuidServiceAssembler;
import org.apache.zest.test.AbstractQi4jTest;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

public class UuidServiceTest extends AbstractQi4jTest
{
    public void assemble( ModuleAssembly module ) throws AssemblyException
    {
        new UuidServiceAssembler().assemble(module);
        module.transients( UnderTestComposite.class );
    }

    @Test
    public void whenGeneratingUuidGivenHashLengthLargerThanZeroThenValidateTheSizeAndContent()
        throws Exception
    {
        UnderTest ut = module.newTransient( UnderTest.class );
        for( int hashLength = 1; hashLength < 50; hashLength++ )
        {
            String uid = ut.generateUuid( hashLength );
            assertEquals( hashLength * 2, uid.length() );
            for( int i = 0; i < uid.length(); i++ )
            {
                char ch = uid.charAt( i );
                assertTrue( ( ch >= '0' && ch <= '9' ) || ( ch >= 'A' && ch <= 'F' ) );
            }
        }
    }

    @Test
    public void whenGeneratingUuidGivenZeroHashLengthThenValidateFormat()
        throws Exception
    {
        UnderTest ut = module.newTransient( UnderTest.class );
        String uid = ut.generateUuid( 0 );
        int dashCounter = 0;
        for( int i = 0; i < uid.length(); i++ )
        {
            char ch = uid.charAt( i );
            if( ch == '-' )
            {
                dashCounter++;
            }
            else
            {
                assertTrue( ( ch >= '0' && ch <= '9' ) || ( ch >= 'A' && ch <= 'F' ) );
            }
        }
        assertEquals( 5, dashCounter );
    }

    @Mixins( UnderTestMixin.class )
    public interface UnderTestComposite extends UnderTest, TransientComposite
    {
    }

    public interface UnderTest
    {
        String generateUuid( int len );
    }

    public static class UnderTestMixin
        implements UnderTest
    {
        @Service private UuidService service;

        public String generateUuid( int len )
        {
            return service.generateUuid( len );
        }
    }
}