renamed back to testing-modules, pulled together testing-modules-2 modules into single module

testing-modules/junit-4/src/main/java/com/baeldung/junitparams/SafeAdditionUtil.java

@@ -0,0 +1,15 @@
+package com.baeldung.junitparams;
+
+public class SafeAdditionUtil {
+
+    public int safeAdd(int a, int b) {
+        long result = ((long) a) + b;
+        if (result > Integer.MAX_VALUE) {
+            return Integer.MAX_VALUE;
+        } else if (result < Integer.MIN_VALUE) {
+            return Integer.MIN_VALUE;
+        }
+        return (int) result;
+    }
+
+}