[BAEL-16005] moved articles from libraries to libraries-security and libraries testing. Renamed TinkUnitTest to TinkLiveTest failing due InvalidKeyException

libraries-testing/src/main/java/com/baeldung/serenity/spring/AdderService.java

@@ -0,0 +1,25 @@
+package com.baeldung.serenity.spring;
+
+import org.springframework.stereotype.Service;
+
+@Service
+public class AdderService {
+
+    private int num;
+
+    public void baseNum(int base) {
+        this.num = base;
+    }
+
+    public int currentBase() {
+        return num;
+    }
+
+    public int add(int adder) {
+        return this.num + adder;
+    }
+
+    public int accumulate(int adder) {
+        return this.num += adder;
+    }
+}