AbbreviatorTest.java

/**
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 * permit persons to whom the Software  is furnished to do so, subject to
 * the following conditions:
 *
 * The  above  copyright  notice  and  this permission  notice  shall  be
 * included in all copies or substantial portions of the Software.
 *
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 * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
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package org.slf4j.migrator.helper;

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

import org.junit.Test;

public class AbbreviatorTest {

    static final char FS = '/';
    static final String INPUT_0 = "/abc/123456/ABC";
    static final String INPUT_1 = "/abc/123456/xxxxx/ABC";

    RandomHelper rh = new RandomHelper(FS);

    @Test
    public void testSmoke() {
        {
            Abbreviator abb = new Abbreviator(2, 100, FS);
            String r = abb.abbreviate(INPUT_0);
            assertEquals(INPUT_0, r);
        }

        {
            Abbreviator abb = new Abbreviator(3, 8, FS);
            String r = abb.abbreviate(INPUT_0);
            assertEquals("/abc/.../ABC", r);
        }
        {
            Abbreviator abb = new Abbreviator(3, 8, FS);
            String r = abb.abbreviate(INPUT_0);
            assertEquals("/abc/.../ABC", r);
        }
    }

    @Test
    public void testImpossibleToAbbreviate() {
        Abbreviator abb = new Abbreviator(2, 20, FS);
        String in = "iczldqwivpgm/mgrmvbjdxrwmqgprdjusth";
        String r = abb.abbreviate(in);
        assertEquals(in, r);
    }

    @Test
    public void testNoFS() {
        Abbreviator abb = new Abbreviator(2, 100, FS);
        String r = abb.abbreviate("hello");
        assertEquals("hello", r);

    }

    @Test
    public void testZeroPrefix() {
        {
            Abbreviator abb = new Abbreviator(0, 100, FS);
            String r = abb.abbreviate(INPUT_0);
            assertEquals(INPUT_0, r);
        }
    }

    @Test
    public void testTheories() {
        int MAX_RANDOM_FIXED_LEN = 20;
        int MAX_RANDOM_AVG_LEN = 20;
        int MAX_RANDOM_MAX_LEN = 100;
        for (int i = 0; i < 10000; i++) {

            // System.out.println("Test number " + i);

            // 0 <= fixedLen < MAX_RANDOM_FIXED_LEN
            int fixedLen = rh.nextInt(MAX_RANDOM_FIXED_LEN);
            // 5 <= averageLen < MAX_RANDOM_AVG_LEN
            int averageLen = rh.nextInt(MAX_RANDOM_AVG_LEN) + 3;
            // System.out.println("fixedLen="+fixedLen+", averageLen="+averageLen);

            int maxLen = rh.nextInt(MAX_RANDOM_MAX_LEN) + fixedLen;
            if (maxLen <= 1) {
                continue;
            }
            // System.out.println("maxLen="+maxLen);
            int targetLen = (maxLen / 2) + rh.nextInt(maxLen / 2) + 1;

            if (targetLen > maxLen) {
                targetLen = maxLen;
            }
            String filename = rh.buildRandomFileName(averageLen, maxLen);

            Abbreviator abb = new Abbreviator(fixedLen, targetLen, FS);
            String result = abb.abbreviate(filename);
            assertTheory0(averageLen, filename, result, fixedLen, targetLen);
            assertUsefulness(averageLen, filename, result, fixedLen, targetLen);
            assertTheory1(filename, result, fixedLen, targetLen);
            assertTheory2(filename, result, fixedLen, targetLen);
        }
    }

    // result length is smaller than original length
    void assertTheory0(int averageLen, String filename, String result, int fixedLen, int targetLength) {
        assertTrue("filename=[" + filename + "] result=[" + result + "]", result.length() <= filename.length());
    }

    // if conditions allow, result length should be to target length
    void assertUsefulness(int averageLen, String filename, String result, int fixedLen, int targetLength) {
        int resLen = result.length();

        int margin = averageLen * 4;
        if (targetLength > fixedLen + margin) {
            assertTrue("filename=[" + filename + "], result=[" + result + "] resultLength=" + resLen + " fixedLength=" + fixedLen + ", targetLength="
                            + targetLength + ", avgLen=" + averageLen, result.length() <= targetLength + averageLen);
        }
    }

    // result start with prefix found in filename
    void assertTheory1(String filename, String result, int fixedLen, int targetLength) {
        String prefix = filename.substring(0, fixedLen);
        assertTrue(result.startsWith(prefix));
    }

    // The string /.../ is found in the result once at a position higher
    // than fixedLen
    void assertTheory2(String filename, String result, int fixedLen, int targetLength) {
        if (filename == result) {
            return;
        }
        int fillerIndex = result.indexOf(Abbreviator.FILLER);
        assertTrue(fillerIndex >= fixedLen);
    }
}