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Java example source code file (StringUtilsTrimEmptyTest.java)

This example Java source code file (StringUtilsTrimEmptyTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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Java - Java tags/keywords

aaaaaaceeeeiiiinooooouuuuy, aloszzcn, cue, failed, foo, string, stringutilstrimemptytest, test

The StringUtilsTrimEmptyTest.java Java example source code

/*
 * 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.
 */
package org.apache.commons.lang3;

import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;

import org.junit.Test;

/**
 * Unit tests {@link org.apache.commons.lang3.StringUtils} - Trim/Empty methods
 */
public class StringUtilsTrimEmptyTest  {
    private static final String FOO = "foo";

    //-----------------------------------------------------------------------
    @Test
    public void testIsEmpty() {
        assertTrue(StringUtils.isEmpty(null));
        assertTrue(StringUtils.isEmpty(""));
        assertFalse(StringUtils.isEmpty(" "));
        assertFalse(StringUtils.isEmpty("foo"));
        assertFalse(StringUtils.isEmpty("  foo  "));
    }

    @Test
    public void testIsNotEmpty() {
        assertFalse(StringUtils.isNotEmpty(null));
        assertFalse(StringUtils.isNotEmpty(""));
        assertTrue(StringUtils.isNotEmpty(" "));
        assertTrue(StringUtils.isNotEmpty("foo"));
        assertTrue(StringUtils.isNotEmpty("  foo  "));
    }

    @Test
    public void testIsBlank() {
        assertTrue(StringUtils.isBlank(null));
        assertTrue(StringUtils.isBlank(""));
        assertTrue(StringUtils.isBlank(StringUtilsTest.WHITESPACE));
        assertFalse(StringUtils.isBlank("foo"));
        assertFalse(StringUtils.isBlank("  foo  "));
    }

    @Test
    public void testIsNotBlank() {
        assertFalse(StringUtils.isNotBlank(null));
        assertFalse(StringUtils.isNotBlank(""));
        assertFalse(StringUtils.isNotBlank(StringUtilsTest.WHITESPACE));
        assertTrue(StringUtils.isNotBlank("foo"));
        assertTrue(StringUtils.isNotBlank("  foo  "));
    }

    //-----------------------------------------------------------------------
    @Test
    public void testTrim() {
        assertEquals(FOO, StringUtils.trim(FOO + "  "));
        assertEquals(FOO, StringUtils.trim(" " + FOO + "  "));
        assertEquals(FOO, StringUtils.trim(" " + FOO));
        assertEquals(FOO, StringUtils.trim(FOO + ""));
        assertEquals("", StringUtils.trim(" \t\r\n\b "));
        assertEquals("", StringUtils.trim(StringUtilsTest.TRIMMABLE));
        assertEquals(StringUtilsTest.NON_TRIMMABLE, StringUtils.trim(StringUtilsTest.NON_TRIMMABLE));
        assertEquals("", StringUtils.trim(""));
        assertEquals(null, StringUtils.trim(null));
    }

    @Test
    public void testTrimToNull() {
        assertEquals(FOO, StringUtils.trimToNull(FOO + "  "));
        assertEquals(FOO, StringUtils.trimToNull(" " + FOO + "  "));
        assertEquals(FOO, StringUtils.trimToNull(" " + FOO));
        assertEquals(FOO, StringUtils.trimToNull(FOO + ""));
        assertEquals(null, StringUtils.trimToNull(" \t\r\n\b "));
        assertEquals(null, StringUtils.trimToNull(StringUtilsTest.TRIMMABLE));
        assertEquals(StringUtilsTest.NON_TRIMMABLE, StringUtils.trimToNull(StringUtilsTest.NON_TRIMMABLE));
        assertEquals(null, StringUtils.trimToNull(""));
        assertEquals(null, StringUtils.trimToNull(null));
    }

    @Test
    public void testTrimToEmpty() {
        assertEquals(FOO, StringUtils.trimToEmpty(FOO + "  "));
        assertEquals(FOO, StringUtils.trimToEmpty(" " + FOO + "  "));
        assertEquals(FOO, StringUtils.trimToEmpty(" " + FOO));
        assertEquals(FOO, StringUtils.trimToEmpty(FOO + ""));
        assertEquals("", StringUtils.trimToEmpty(" \t\r\n\b "));
        assertEquals("", StringUtils.trimToEmpty(StringUtilsTest.TRIMMABLE));
        assertEquals(StringUtilsTest.NON_TRIMMABLE, StringUtils.trimToEmpty(StringUtilsTest.NON_TRIMMABLE));
        assertEquals("", StringUtils.trimToEmpty(""));
        assertEquals("", StringUtils.trimToEmpty(null));
    }

    //-----------------------------------------------------------------------
    @Test
    public void testStrip_String() {
        assertEquals(null, StringUtils.strip(null));
        assertEquals("", StringUtils.strip(""));
        assertEquals("", StringUtils.strip("        "));
        assertEquals("abc", StringUtils.strip("  abc  "));
        assertEquals(StringUtilsTest.NON_WHITESPACE, 
            StringUtils.strip(StringUtilsTest.WHITESPACE + StringUtilsTest.NON_WHITESPACE + StringUtilsTest.WHITESPACE));
    }
    
    @Test
    public void testStripToNull_String() {
        assertEquals(null, StringUtils.stripToNull(null));
        assertEquals(null, StringUtils.stripToNull(""));
        assertEquals(null, StringUtils.stripToNull("        "));
        assertEquals(null, StringUtils.stripToNull(StringUtilsTest.WHITESPACE));
        assertEquals("ab c", StringUtils.stripToNull("  ab c  "));
        assertEquals(StringUtilsTest.NON_WHITESPACE, 
            StringUtils.stripToNull(StringUtilsTest.WHITESPACE + StringUtilsTest.NON_WHITESPACE + StringUtilsTest.WHITESPACE));
    }
    
    @Test
    public void testStripToEmpty_String() {
        assertEquals("", StringUtils.stripToEmpty(null));
        assertEquals("", StringUtils.stripToEmpty(""));
        assertEquals("", StringUtils.stripToEmpty("        "));
        assertEquals("", StringUtils.stripToEmpty(StringUtilsTest.WHITESPACE));
        assertEquals("ab c", StringUtils.stripToEmpty("  ab c  "));
        assertEquals(StringUtilsTest.NON_WHITESPACE, 
            StringUtils.stripToEmpty(StringUtilsTest.WHITESPACE + StringUtilsTest.NON_WHITESPACE + StringUtilsTest.WHITESPACE));
    }
    
    @Test
    public void testStrip_StringString() {
        // null strip
        assertEquals(null, StringUtils.strip(null, null));
        assertEquals("", StringUtils.strip("", null));
        assertEquals("", StringUtils.strip("        ", null));
        assertEquals("abc", StringUtils.strip("  abc  ", null));
        assertEquals(StringUtilsTest.NON_WHITESPACE, 
            StringUtils.strip(StringUtilsTest.WHITESPACE + StringUtilsTest.NON_WHITESPACE + StringUtilsTest.WHITESPACE, null));

        // "" strip
        assertEquals(null, StringUtils.strip(null, ""));
        assertEquals("", StringUtils.strip("", ""));
        assertEquals("        ", StringUtils.strip("        ", ""));
        assertEquals("  abc  ", StringUtils.strip("  abc  ", ""));
        assertEquals(StringUtilsTest.WHITESPACE, StringUtils.strip(StringUtilsTest.WHITESPACE, ""));
        
        // " " strip
        assertEquals(null, StringUtils.strip(null, " "));
        assertEquals("", StringUtils.strip("", " "));
        assertEquals("", StringUtils.strip("        ", " "));
        assertEquals("abc", StringUtils.strip("  abc  ", " "));
        
        // "ab" strip
        assertEquals(null, StringUtils.strip(null, "ab"));
        assertEquals("", StringUtils.strip("", "ab"));
        assertEquals("        ", StringUtils.strip("        ", "ab"));
        assertEquals("  abc  ", StringUtils.strip("  abc  ", "ab"));
        assertEquals("c", StringUtils.strip("abcabab", "ab"));
        assertEquals(StringUtilsTest.WHITESPACE, StringUtils.strip(StringUtilsTest.WHITESPACE, ""));
    }
    
    @Test
    public void testStripStart_StringString() {
        // null stripStart
        assertEquals(null, StringUtils.stripStart(null, null));
        assertEquals("", StringUtils.stripStart("", null));
        assertEquals("", StringUtils.stripStart("        ", null));
        assertEquals("abc  ", StringUtils.stripStart("  abc  ", null));
        assertEquals(StringUtilsTest.NON_WHITESPACE + StringUtilsTest.WHITESPACE, 
            StringUtils.stripStart(StringUtilsTest.WHITESPACE + StringUtilsTest.NON_WHITESPACE + StringUtilsTest.WHITESPACE, null));

        // "" stripStart
        assertEquals(null, StringUtils.stripStart(null, ""));
        assertEquals("", StringUtils.stripStart("", ""));
        assertEquals("        ", StringUtils.stripStart("        ", ""));
        assertEquals("  abc  ", StringUtils.stripStart("  abc  ", ""));
        assertEquals(StringUtilsTest.WHITESPACE, StringUtils.stripStart(StringUtilsTest.WHITESPACE, ""));
        
        // " " stripStart
        assertEquals(null, StringUtils.stripStart(null, " "));
        assertEquals("", StringUtils.stripStart("", " "));
        assertEquals("", StringUtils.stripStart("        ", " "));
        assertEquals("abc  ", StringUtils.stripStart("  abc  ", " "));
        
        // "ab" stripStart
        assertEquals(null, StringUtils.stripStart(null, "ab"));
        assertEquals("", StringUtils.stripStart("", "ab"));
        assertEquals("        ", StringUtils.stripStart("        ", "ab"));
        assertEquals("  abc  ", StringUtils.stripStart("  abc  ", "ab"));
        assertEquals("cabab", StringUtils.stripStart("abcabab", "ab"));
        assertEquals(StringUtilsTest.WHITESPACE, StringUtils.stripStart(StringUtilsTest.WHITESPACE, ""));
    }
    
    @Test
    public void testStripEnd_StringString() {
        // null stripEnd
        assertEquals(null, StringUtils.stripEnd(null, null));
        assertEquals("", StringUtils.stripEnd("", null));
        assertEquals("", StringUtils.stripEnd("        ", null));
        assertEquals("  abc", StringUtils.stripEnd("  abc  ", null));
        assertEquals(StringUtilsTest.WHITESPACE + StringUtilsTest.NON_WHITESPACE, 
            StringUtils.stripEnd(StringUtilsTest.WHITESPACE + StringUtilsTest.NON_WHITESPACE + StringUtilsTest.WHITESPACE, null));

        // "" stripEnd
        assertEquals(null, StringUtils.stripEnd(null, ""));
        assertEquals("", StringUtils.stripEnd("", ""));
        assertEquals("        ", StringUtils.stripEnd("        ", ""));
        assertEquals("  abc  ", StringUtils.stripEnd("  abc  ", ""));
        assertEquals(StringUtilsTest.WHITESPACE, StringUtils.stripEnd(StringUtilsTest.WHITESPACE, ""));
        
        // " " stripEnd
        assertEquals(null, StringUtils.stripEnd(null, " "));
        assertEquals("", StringUtils.stripEnd("", " "));
        assertEquals("", StringUtils.stripEnd("        ", " "));
        assertEquals("  abc", StringUtils.stripEnd("  abc  ", " "));
        
        // "ab" stripEnd
        assertEquals(null, StringUtils.stripEnd(null, "ab"));
        assertEquals("", StringUtils.stripEnd("", "ab"));
        assertEquals("        ", StringUtils.stripEnd("        ", "ab"));
        assertEquals("  abc  ", StringUtils.stripEnd("  abc  ", "ab"));
        assertEquals("abc", StringUtils.stripEnd("abcabab", "ab"));
        assertEquals(StringUtilsTest.WHITESPACE, StringUtils.stripEnd(StringUtilsTest.WHITESPACE, ""));
    }

    @Test
    public void testStripAll() {
        // test stripAll method, merely an array version of the above strip
        final String[] empty = new String[0];
        final String[] fooSpace = new String[] { "  "+FOO+"  ", "  "+FOO, FOO+"  " };
        final String[] fooDots = new String[] { ".."+FOO+"..", ".."+FOO, FOO+".." };
        final String[] foo = new String[] { FOO, FOO, FOO };

        assertNull(StringUtils.stripAll((String[]) null));
        // Additional varargs tests
        assertArrayEquals(empty, StringUtils.stripAll()); // empty array
        assertArrayEquals(new String[]{null}, StringUtils.stripAll((String) null)); // == new String[]{null}

        assertArrayEquals(empty, StringUtils.stripAll(empty));
        assertArrayEquals(foo, StringUtils.stripAll(fooSpace));
        
        assertNull(StringUtils.stripAll(null, null));
        assertArrayEquals(foo, StringUtils.stripAll(fooSpace, null));
        assertArrayEquals(foo, StringUtils.stripAll(fooDots, "."));
    }

    @Test
    public void testStripAccents() {
        final String cue = "\u00C7\u00FA\u00EA";
        assertEquals( "Failed to strip accents from " + cue, "Cue", StringUtils.stripAccents(cue));

        final String lots = "\u00C0\u00C1\u00C2\u00C3\u00C4\u00C5\u00C7\u00C8\u00C9" + 
                      "\u00CA\u00CB\u00CC\u00CD\u00CE\u00CF\u00D1\u00D2\u00D3" + 
                      "\u00D4\u00D5\u00D6\u00D9\u00DA\u00DB\u00DC\u00DD";
        assertEquals( "Failed to strip accents from " + lots, 
                      "AAAAAACEEEEIIIINOOOOOUUUUY", 
                      StringUtils.stripAccents(lots));

        assertNull( "Failed null safety", StringUtils.stripAccents(null) );
        assertEquals( "Failed empty String", "", StringUtils.stripAccents("") );
        assertEquals( "Failed to handle non-accented text", "control", StringUtils.stripAccents("control") );
        assertEquals( "Failed to handle easy example", "eclair", StringUtils.stripAccents("\u00E9clair") );
        assertEquals("ALOSZZCN aloszzcn", StringUtils.stripAccents("\u0104\u0141\u00D3\u015A\u017B\u0179\u0106\u0143 "
                + "\u0105\u0142\u00F3\u015B\u017C\u017A\u0107\u0144"));
    }
}

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