java-tutorials/java-strings/src/test/java/com/baeldung/string/StringReplaceAndRemoveUnitTest.java

package com.baeldung.string;


import org.apache.commons.lang3.StringUtils;
import org.junit.Test;

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

public class StringReplaceAndRemoveUnitTest {


    @Test
    public void givenTestStrings_whenReplace_thenProcessedString() {

        String master = "Hello World Baeldung!";
        String target = "Baeldung";
        String replacement = "Java";
        String processed = master.replace(target, replacement);
        assertTrue(processed.contains(replacement));
        assertFalse(processed.contains(target));

    }

    @Test
    public void givenTestStrings_whenReplaceAll_thenProcessedString() {

        String master2 = "Welcome to Baeldung, Hello World Baeldung";
        String regexTarget= "(Baeldung)$";
        String replacement = "Java";
        String processed2 = master2.replaceAll(regexTarget, replacement);
        assertTrue(processed2.endsWith("Java"));

    }

    @Test
    public void givenTestStrings_whenStringBuilderMethods_thenProcessedString() {

        String master = "Hello World Baeldung!";
        String target = "Baeldung";
        String replacement = "Java";

        int startIndex = master.indexOf(target);
        int stopIndex = startIndex + target.length();

        StringBuilder builder = new StringBuilder(master);


        builder.delete(startIndex, stopIndex);
        assertFalse(builder.toString().contains(target));


        builder.replace(startIndex, stopIndex, replacement);
        assertTrue(builder.toString().contains(replacement));


    }


    @Test
    public void givenTestStrings_whenStringUtilsMethods_thenProcessedStrings() {

        String master = "Hello World Baeldung!";
        String target = "Baeldung";
        String replacement = "Java";

        String processed = StringUtils.replace(master, target, replacement);
        assertTrue(processed.contains(replacement));

        String master2 = "Hello World Baeldung!";
        String target2 = "baeldung";
        String processed2 = StringUtils.replaceIgnoreCase(master2, target2, replacement);
        assertFalse(processed2.contains(target));

    }







}