Added test code for counting words in a string in Java

java-strings-3/src/main/java/com/baeldung/string/README.md

@@ -1,3 +0,0 @@
-This file exists to ensure this empty directory is committed in Git.
-
-Please remove this file when this directory is populated.

java-strings-3/src/main/java/com/baeldung/string/wordcount/WordCounter.java

@@ -2,19 +2,9 @@ package com.baeldung.string.wordcount;
 
 import java.util.StringTokenizer;
 
-/**
- * Created by alfred on 14 August 2019
- */
 public class WordCounter {
     public static void main(String[] args) {
-        //test string
-        String random = "Lorem%Ipsum is-simply dummy text.";
-
-        System.out.printf("Using delimiter, word count: %d\n", countWordsUsingTokenizer(random));
-        System.out.printf("Using no library method, word count: %d\n", countWordsManually(random));
-        System.out.printf("Using punctuation regex, word count: %d\n", countWordsUsingRegex(random));
-        System.out.printf("\n\n%s\n\n", random);
-
+        
     }
 
     public static int countWordsUsingRegex(String arg) {

java-strings-3/src/test/java/com/baeldung/string/wordcount/WordCountUnitTest.java

@@ -0,0 +1,24 @@
+package com.baeldung.string.wordcount;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.Test;
+public class WordCountUnitTest {
+    private String string1 = "This is a test sentence with eight words";
+    private String string2 = "This#is%a test sentence with eight       words";
+
+    @Test
+    public void givenStringWith8Words_whenUsingRegexCount_ThenResultEqual8() {
+        assertThat(WordCounter.countWordsUsingRegex(string2) == 8).isTrue();
+    }
+
+    @Test
+    public void givenStringWith8Words_whenUsingManualMethod_ThenWordCountEqual8() {
+        assertThat(WordCounter.countWordsManually(string1) == 8).isTrue();
+    }
+
+    @Test
+    public void givenAStringWith8Words_whenUsingTokenizer_ThenWordCountEqual8() {
+        assertThat(WordCounter.countWordsUsingTokenizer(string1) == 8).isTrue();
+    }
+}