using NUnit.Framework;
using System;
using System.IO;

namespace Lucene.Net.Analysis.Miscellaneous
{
    /*
     * 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.
     */

    /// <summary>
    /// Test the truncate token filter.
    /// </summary>
    public class TestTruncateTokenFilter : BaseTokenStreamTestCase
    {

        [Test]
        public virtual void TestTruncating()
        {
            TokenStream stream = new MockTokenizer(new StringReader("abcdefg 1234567 ABCDEFG abcde abc 12345 123"), MockTokenizer.WHITESPACE, false);
            stream = new TruncateTokenFilter(stream, 5);
            AssertTokenStreamContents(stream, new string[] { "abcde", "12345", "ABCDE", "abcde", "abc", "12345", "123" });
        }

        [Test]
        public virtual void TestNonPositiveLength()
        {
            Assert.Throws<ArgumentOutOfRangeException>(() => {
                new TruncateTokenFilter(new MockTokenizer(new StringReader("length must be a positive number")), -48);
            });
        }
    }
}