StringTruncationTest.java

/*
 *  Copyright 2009, Mahmood Ali.
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are
 *  met:
 *
 *    * Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *    * Redistributions in binary form must reproduce the above
 *      copyright notice, this list of conditions and the following disclaimer
 *      in the documentation and/or other materials provided with the
 *      distribution.
 *    * Neither the name of Mahmood Ali. nor the names of its
 *      contributors may be used to endorse or promote products derived from
 *      this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.notnoop.apns.utils;

import org.junit.Assert;

import org.junit.experimental.theories.DataPoints;
import org.junit.experimental.theories.Theories;
import org.junit.experimental.theories.Theory;
import org.junit.runner.RunWith;

import com.notnoop.apns.internal.Utilities;

// Test inspired by http://stackoverflow.com/questions/119328/how-do-i-truncate-a-java-string-to-fit-in-a-given-number-of-bytes-once-utf-8-enc
@RunWith(Theories.class)
public class StringTruncationTest {
    @DataPoints public static Object[][] dataPoints = {
            {"abcd", 0, 0},
            {"abcd", 1, 1},
            {"abcd", 2, 2},
            {"abcd", 3, 3},
            {"abcd", 4, 4},
            {"abcd", 5, 4},

            {"a\u0080b", 0, 0},
            {"a\u0080b", 1, 1},
            {"a\u0080b", 2, 1},
            {"a\u0080b", 3, 3},
            {"a\u0080b", 4, 4},
            {"a\u0080b", 5, 4},

            {"a\u0800b", 0, 0},
            {"a\u0800b", 1, 1},
            {"a\u0800b", 2, 1},
            {"a\u0800b", 3, 1},
            {"a\u0800b", 4, 4},
            {"a\u0800b", 5, 5},
            {"a\u0800b", 6, 5},
    };

    @DataPoints public static Object[][] surrogatePairs = {
            {"\uD834\uDD1E", 0, 0},
            {"\uD834\uDD1E", 1, 0},
            {"\uD834\uDD1E", 2, 0},
            {"\uD834\uDD1E", 3, 0},
            {"\uD834\uDD1E", 4, 4},
            {"\uD834\uDD1E", 5, 4}
    };

    @Theory
    public void truncateUTF8Properly(Object[] p) {
        String str = (String)p[0];
        int maxBytes = (Integer)p[1];
        int expectedBytes = (Integer)p[2];

        String result = Utilities.truncateWhenUTF8(str, maxBytes);
        byte[] utf8 = Utilities.toUTF8Bytes(result);

        Assert.assertEquals(expectedBytes, utf8.length);
    }
}