StringUtilTest.java

package chatty.util;

import java.util.ArrayList;
import java.util.Collection;
import org.junit.Test;
import static org.junit.Assert.*;

/**
 *
 * @author tduva
 */
public class StringUtilTest {
    
    @Test
    public void testRemoveLinebreakCharacters() {
        assertEquals(StringUtil.removeLinebreakCharacters("abc\r\nabc"), "abc abc");
        assertEquals(StringUtil.removeLinebreakCharacters("abc\rabc"), "abc abc");
        assertEquals(StringUtil.removeLinebreakCharacters("abc\nabc"), "abc abc");
        assertEquals(StringUtil.removeLinebreakCharacters("abc abc"), "abc abc");
        assertEquals(StringUtil.removeLinebreakCharacters("abc\r\r\r\r\rabc"), "abc abc");
        assertEquals(StringUtil.removeLinebreakCharacters("abc\r\n\n\r\rabc"), "abc abc");
        assertEquals(StringUtil.removeLinebreakCharacters("\nabc abc"), " abc abc");
        assertEquals(StringUtil.removeLinebreakCharacters("\r"), " ");
    }
    
    @Test
    public void testRemoveDuplicateWhitespace() {
        assertEquals(StringUtil.removeDuplicateWhitespace("abc  abc"), "abc abc");
        assertEquals(StringUtil.removeDuplicateWhitespace("abc   abc"), "abc abc");
        assertEquals(StringUtil.removeDuplicateWhitespace("abcabc"), "abcabc");
        assertEquals(StringUtil.removeDuplicateWhitespace("abc abc"), "abc abc");
        assertEquals(StringUtil.removeDuplicateWhitespace("  "), " ");
        assertEquals(StringUtil.removeDuplicateWhitespace(""), "");
    }
    
    @Test
    public void testAppend() {
        assertEquals(StringUtil.append("abc", "|", "abc"), "abc|abc");
        assertEquals(StringUtil.append("abc", "", "abc"), "abcabc");
        assertEquals(StringUtil.append(null, "|", "b"), "b");
        assertEquals(StringUtil.append("", "|", "b"), "b");
        assertEquals(StringUtil.append("abc", "|", null), "abc");
        assertEquals(StringUtil.append("abc", null, "abc"), "abcnullabc");
        assertEquals(StringUtil.append(null, null, null), null);
    }
    
    @Test
    public void testJoin() {
        Collection<String> list = new ArrayList<>();
        list.add("a");
        list.add("b");
        list.add("c");
        assertEquals(StringUtil.join(list, " "), "a b c");
        assertEquals(StringUtil.join(list, ", "), "a, b, c");
        assertEquals(StringUtil.join(list, ", ", 1), "b, c");
        assertEquals(StringUtil.join(list, ", ", 0, 2), "a, b");
        assertEquals(StringUtil.join(list, ", ", -1, 2), "a, b");
        assertEquals(StringUtil.join(list, ", ", 1, 2), "b");
        assertEquals(StringUtil.join(list, ", ", 3), "");
        list.add(" d");
        assertEquals(StringUtil.join(list, ", "), "a, b, c,  d");
    }
    
}