StringWrapperTest.java example

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package org.jf.util;

import com.google.common.collect.Lists;
import org.junit.Assert;
import org.junit.Test;

import java.util.List;

public class StringWrapperTest {
    @Test
    public void testWrapStringByWords() {
        validateResult2(new String[]{"abc", "abcdef", "abcdef"},
                "abc\nabcdefabcdef", 6);

        validateResult2(new String[]{"abc", "abcdef", " ", "abcdef"},
                "abc\nabcdef abcdef", 6);

        validateResult2(new String[]{"abc", "abcde ", "fabcde", "f"},
                "abc\nabcde fabcdef", 6);

        validateResult2(new String[]{"abc def ghi ", "kjl mon pqr ", "stu vwx yz"},
                "abc def ghi kjl mon pqr stu vwx yz", 14);

        validateResult2(new String[]{"abcdefg", "hikjlmo", "npqrstu", "vwxyz"},
                "abcdefghikjlmonpqrstuvwxyz", 7);

        validateResult2(new String[]{"abc", "defhig"},
                "abc\ndefhig", 20);
    }

    @Test
    public void testWrapString() {
        validateResult(
                new String[]{"abc", "abcdef", "abcdef"},
                StringWrapper.wrapString("abc\nabcdefabcdef", 6, null));

        validateResult(
                new String[]{"abc"},
                StringWrapper.wrapString("abc", 6, new String[3]));

        validateResult(
                new String[]{"abc"},
                StringWrapper.wrapString("abc", 6, new String[0]));

        validateResult(
                new String[]{"abc"},
                StringWrapper.wrapString("abc", 6, new String[1]));

        validateResult(
                new String[]{""},
                StringWrapper.wrapString("", 6, new String[3]));

        validateResult(
                new String[]{"abcdef"},
                StringWrapper.wrapString("abcdef", 6, new String[3]));

        validateResult(
                new String[]{"abcdef", "abcdef"},
                StringWrapper.wrapString("abcdef\nabcdef", 6, new String[3]));

        validateResult(
                new String[]{"abc", "", "def"},
                StringWrapper.wrapString("abc\n\ndef", 6, new String[3]));

        validateResult(
                new String[]{"", "abcdef"},
                StringWrapper.wrapString("\nabcdef", 6, new String[3]));

        validateResult(
                new String[]{"", "", "abcdef"},
                StringWrapper.wrapString("\n\nabcdef", 6, new String[3]));

        validateResult(
                new String[]{"", "", "abcdef"},
                StringWrapper.wrapString("\n\nabcdef", 6, new String[4]));

        validateResult(
                new String[]{"", "", "abcdef", ""},
                StringWrapper.wrapString("\n\nabcdef\n\n", 6, new String[4]));

        validateResult(
                new String[]{"", "", "abcdef", "a", ""},
                StringWrapper.wrapString("\n\nabcdefa\n\n", 6, new String[4]));

        validateResult(
                new String[]{"", "", "abcdef", "a", ""},
                StringWrapper.wrapString("\n\nabcdefa\n\n", 6, new String[0]));

        validateResult(
                new String[]{"", "", "abcdef", "a", ""},
                StringWrapper.wrapString("\n\nabcdefa\n\n", 6, new String[5]));

        validateResult(
                new String[]{"", "", "a", "b", "c", "d", "e", "f", "a", ""},
                StringWrapper.wrapString("\n\nabcdefa\n\n", 1, new String[5]));
    }

    public static void validateResult(String[] expected, String[] actual) {
        Assert.assertTrue(actual.length >= expected.length);

        int i;
        for (i=0; i<actual.length; i++) {
            if (actual[i] == null) {
                Assert.assertTrue(i == expected.length);
                return;
            }
            Assert.assertTrue(i < expected.length);
            Assert.assertEquals(expected[i], actual[i]);
        }
    }

    public static void validateResult2(String[] expected, String textToWrap, int maxWidth) {
        List<String> result = Lists.newArrayList(StringWrapper.wrapStringOnBreaks(textToWrap, maxWidth));

        Assert.assertEquals(expected.length, result.size());
        int i;
        for (i=0; i<result.size(); i++) {
            Assert.assertTrue(i < expected.length);
            Assert.assertEquals(expected[i], result.get(i));
        }
    }
}