[BAEL-18364] move spring-rest-*** articles - 1

testing-modules/testing-libraries/src/main/java/com/baeldung/cucumber/Calculator.java

@@ -0,0 +1,7 @@
+package com.baeldung.cucumber;
+
+public class Calculator {
+    public int add(int a, int b) {
+        return a + b;
+    }
+}

testing-modules/testing-libraries/src/main/java/com/baeldung/lambdabehave/Calculator.java

@@ -0,0 +1,24 @@
+package com.baeldung.lambdabehave;
+
+public class Calculator {
+
+    private int x;
+    private int y;
+
+    Calculator(int x, int y) {
+        this.x = x;
+        this.y = y;
+    }
+
+    public int add() {
+        return this.x + this.y;
+    }
+
+    public int divide(int a, int b) {
+        return a / b;
+    }
+
+    public int add(int a, int b) {
+        return a + b;
+    }
+}

testing-modules/testing-libraries/src/main/java/com/baeldung/mutation/Palindrome.java

@@ -0,0 +1,15 @@
+package com.baeldung.mutation;
+
+public class Palindrome {
+    
+    public boolean isPalindrome(String inputString) {
+        if (inputString.length() == 0) {
+            return true;
+        } else {
+            char firstChar = inputString.charAt(0);
+            char lastChar = inputString.charAt(inputString.length() - 1);
+            String mid = inputString.substring(1, inputString.length() - 1);
+            return (firstChar == lastChar) && isPalindrome(mid);
+        }
+    }   
+}