Fix typo

libraries-apache-commons/src/test/java/com/baeldung/text/StrBuilderUnitTest.java

@@ -0,0 +1,24 @@
+package com.baeldung.text;
+
+import org.apache.commons.text.StrBuilder;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class StrBuilderUnitTest {
+
+    @Test
+    public void whenReplaced_thenCorrect() {
+        StrBuilder strBuilder = new StrBuilder("example StrBuilder!");
+        strBuilder.replaceAll("example", "new");
+
+        Assert.assertEquals(new StrBuilder("new StrBuilder!"), strBuilder);
+    }
+
+    @Test
+    public void whenCleared_thenEmpty() {
+        StrBuilder strBuilder = new StrBuilder("example StrBuilder!");
+        strBuilder.clear();
+
+        Assert.assertEquals(new StrBuilder(""), strBuilder);
+    }
+}