/*
 * Copyright (c) 2008-2015, Hazelcast, Inc. 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 com.hazelcast.util;

import com.hazelcast.test.HazelcastSerialClassRunner;
import com.hazelcast.test.annotation.QuickTest;

import static org.junit.Assert.assertEquals;


import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.runner.RunWith;

@RunWith(HazelcastSerialClassRunner.class)
@Category(QuickTest.class)
public class MD5UtilTest {

    @Test
    public void testToMD5String() {
        String result = MD5Util.toMD5String("hazelcast");
        assertEquals("58c304267fc3edac49d35c395f0fbc0f", result);
    }

    @Test
    public void testToMD5String_whenNullString() {
        String str = null;
        String result = MD5Util.toMD5String(str);
        assertEquals("NULL", result);
    }

}

/*
 * Copyright (c) 2008-2015, Hazelcast, Inc. 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 com.hazelcast.util;

import com.hazelcast.test.HazelcastSerialClassRunner;
import com.hazelcast.test.HazelcastTestSupport;
import com.hazelcast.test.annotation.QuickTest;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.runner.RunWith;

@RunWith(HazelcastSerialClassRunner.class)
@Category(QuickTest.class)
public class MD5UtilTest extends HazelcastTestSupport {
    @Test
    public void testConstructorIsPrivate()  {
        assertUtilityConstructor(MD5Util.class);
    }
    
    @Test
    public void testToMD5String() {
        String result = MD5Util.toMD5String("hazelcast");
        assertEquals("58c304267fc3edac49d35c395f0fbc0f", result);
    }

    @Test
    public void testToMD5String_whenNullString() {
        String str = null;
        String result = MD5Util.toMD5String(str);
        assertEquals("NULL", result);
    }

}

Update MD5UtilTest.java