src/tests/junit/org/apache/tools/ant/util/StringUtilsTest.java

/*
 *  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
 *
 *      https://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.tools.ant.util;

import java.util.Arrays;
import java.util.Collection;
import java.util.Vector;

import org.junit.Test;

import static org.hamcrest.Matchers.endsWith;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;

/**
 * Test for StringUtils
 */
public class StringUtilsTest {

    @Test
    public void testSplit() {
        final String data = "a,b,,";
        Vector<String> res = StringUtils.split(data, ',');
        assertEquals(4, res.size());
        assertEquals("a", res.elementAt(0));
        assertEquals("b", res.elementAt(1));
        assertEquals("", res.elementAt(2));
        assertEquals("", res.elementAt(3));
    }

    @Test
    public void testSplitLines() {
        final String data = "a\r\nb\nc\nd\ne";
        Vector<String> res = StringUtils.lineSplit(data);
        assertEquals(5, res.size());
        assertEquals("a\r", res.elementAt(0));
        assertEquals("b", res.elementAt(1));
        assertEquals("c", res.elementAt(2));
        assertEquals("d", res.elementAt(3));
        assertEquals("e", res.elementAt(4));
    }

    @SuppressWarnings("deprecation")
    @Test
    public void testReplace() {
        final String data = "abcabcabca";
        String res = StringUtils.replace(data, "a", "");
        assertEquals("bcbcbc", res);
    }

    @Test
    public void testEndsWithBothEmpty() {
        assertTrue(StringUtils.endsWith(new StringBuffer(), ""));
    }

    @Test
    public void testEndsWithEmptyString() {
        assertTrue(StringUtils.endsWith(new StringBuffer("12234545"), ""));
    }

    @Test
    public void testEndsWithShorterString() {
        assertTrue(StringUtils.endsWith(new StringBuffer("12345678"), "78"));
    }

    @Test
    public void testEndsWithSameString() {
        assertTrue(StringUtils.endsWith(new StringBuffer("123"), "123"));
    }

    @Test
    public void testEndsWithLongerString() {
        assertFalse(StringUtils.endsWith(new StringBuffer("12"), "1245"));
    }

    @Test
    public void testEndsWithNoMatch() {
        assertFalse(StringUtils.endsWith(new StringBuffer("12345678"), "789"));
    }

    @Test
    public void testEndsWithEmptyBuffer() {
        assertFalse(StringUtils.endsWith(new StringBuffer(), "12345667"));
    }

    @Test
    public void testEndsWithJDKPerf() {
        StringBuffer buf = getFilledBuffer(1024 * 300, 'a');
        for (int i = 0; i < 1000; i++) {
            assertThat(buf.toString(), endsWith("aa"));
        }
    }

    @Test
    public void testEndsWithPerf() {
        StringBuffer buf = getFilledBuffer(1024 * 300, 'a');
        for (int i = 0; i < 1000; i++) {
            assertTrue(StringUtils.endsWith(buf, "aa"));
        }
    }

    private StringBuffer getFilledBuffer(int size, char ch) {
        StringBuffer buf = new StringBuffer(size);
        for (int i = 0; i < size; i++) {
            buf.append(ch);
        }
        return buf;
    }

    @Test
    public void testParseHumanSizes() throws Exception {
        final long KILOBYTE = 1024;
        final long MEGABYTE = KILOBYTE * 1024;
        final long GIGABYTE = MEGABYTE * 1024;
        final long TERABYTE = GIGABYTE * 1024;
        final long PETABYTE = TERABYTE * 1024;
        assertEquals(StringUtils.parseHumanSizes("1K"), KILOBYTE);
        assertEquals(StringUtils.parseHumanSizes("1M"), MEGABYTE);
        assertEquals(StringUtils.parseHumanSizes("1G"), GIGABYTE);
        assertEquals(StringUtils.parseHumanSizes("1T"), TERABYTE);
        assertEquals(StringUtils.parseHumanSizes("1P"), PETABYTE);
        assertEquals(StringUtils.parseHumanSizes("1"), 1L);
    }

    @Test
    public void testRemoveSuffix() {
        String prefix = "Prefix";
        String name = "Name";
        String suffix = "Suffix";
        String input = prefix + name + suffix;
        assertEquals(
            "Does not remove the suffix right.",
            prefix + name,
            StringUtils.removeSuffix(input, suffix));
        assertEquals(
            "Should leave the string unattended.",
            prefix + name + suffix,
            StringUtils.removeSuffix(input, "bla"));
    }

    @Test
    public void testRemovePrefix() {
        String prefix = "Prefix";
        String name = "Name";
        String suffix = "Suffix";
        String input = prefix + name + suffix;
        assertEquals("Does not remove the prefix right.",
            name + suffix,
            StringUtils.removePrefix(input, prefix));
        assertEquals("Should leave the string unattended.",
            prefix + name + suffix,
            StringUtils.removePrefix(input, "bla"));
    }

    @Test
    public void testJoin() {
        assertEquals("a, b, c", StringUtils.join(Arrays.asList("a", "b", "c"), ", "));
    }

    @Test
    public void testJoinEmptyArray() {
        assertEquals("", StringUtils.join(new String[] {}, ", "));
    }

    @Test
    public void testJoinNullCollection() {
        assertEquals("", StringUtils.join((Collection<String>) null, ", "));
    }

    @Test
    public void testJoinNullArray() {
        assertEquals("", StringUtils.join((String[]) null, ", "));
    }

    @Test
    public void testJoinNullSeparator() {
        assertEquals("abc", StringUtils.join(Arrays.asList("a", "b", "c"), null));
    }

    @Test
    public void testTrimToNullWithNullInput() {
        assertNull(StringUtils.trimToNull(null));
    }

    @Test
    public void testTrimToNullWithEmptyInput() {
        assertNull(StringUtils.trimToNull(""));
    }

    @Test
    public void testTrimToNullWithBlankSpaceInput() {
        assertNull(StringUtils.trimToNull("   "));
    }

    @Test
    public void testTrimToNullWithInputPaddedWithSpace() {
        assertEquals("aaBcDeF", StringUtils.trimToNull(" aaBcDeF  "));
    }
}