[BAEL-3348] Moved code to algorithm-4

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

@@ -0,0 +1,16 @@
+package com.baeldung.text;
+
+import org.apache.commons.text.translate.UnicodeEscaper;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class UnicodeEscaperUnitTest {
+
+    @Test
+    public void whenTranslate_thenCorrect() {
+        UnicodeEscaper ue = UnicodeEscaper.above(0);
+        String result = ue.translate("ABCD");
+
+        Assert.assertEquals("\\u0041\\u0042\\u0043\\u0044", result);
+    }
+}