/*
 *  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.tomcat.util.security;

import org.junit.Test;

public class TestConcurrentMessageDigest {

    private static final String SHA256 = "SHA-256";
    private static final String SHA512 = "SHA-512";

    @Test(expected=IllegalStateException.class)
    public void testNoInit() throws Exception {
        // Need to use a different algorithm to the other tests otherwise if one
        // of the other tests is called first it will initialise the
        // ConcurrentDigest for that algorithm.
        ConcurrentMessageDigest.digest(SHA512, new byte[8]);
    }


    @Test
    public void testUncommon() throws Exception {
        ConcurrentMessageDigest.init(SHA256);
        ConcurrentMessageDigest.digest(SHA256, new byte[8]);
    }
}

Expand test coverage