Bael 7317 (#15415)

* BAEL-7226: Code for the improvements of the Percentages article.

* BAEL-7226: Rename Test to follow the convention

* BAEL-7317: Update the code to the latest versions of Spock, Groovy and the maven matching configuration

* BAEL-7317: Add code for the article improvements

testing-modules/groovy-spock/src/main/java/mocks/Book.java

@@ -0,0 +1,11 @@
+package mocks;
+
+public class Book {
+    private String title;
+    private String author;
+
+    Book(String title, String author) {
+        this.title = title;
+        this.author = author;
+    }
+}

testing-modules/groovy-spock/src/main/java/mocks/BookRepository.java

@@ -0,0 +1,5 @@
+package mocks;
+
+public interface BookRepository {
+    Book findById(Long id);
+}

testing-modules/groovy-spock/src/main/java/mocks/BookService.java

@@ -0,0 +1,13 @@
+package mocks;
+
+public class BookService {
+    private final BookRepository repository;
+
+    public BookService(BookRepository repository) {
+        this.repository = repository;
+    }
+
+    public Book getBookDetails(Long id) {
+        return repository.findById(id);
+    }
+}

testing-modules/groovy-spock/src/main/java/mocks/MessageService.java

@@ -0,0 +1,7 @@
+package mocks;
+
+public class MessageService {
+    public String fetchMessage() {
+        return UtilityClass.getMessage();
+    }
+}

testing-modules/groovy-spock/src/main/java/mocks/ShoppingCart.java

@@ -0,0 +1,26 @@
+package mocks;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class ShoppingCart {
+    private final Map<String, Integer> items = new HashMap<>();
+    private double totalPrice = 0.0;
+
+    public void addItem(String item, int quantity) {
+        items.put(item, items.getOrDefault(item, 0) + quantity);
+        totalPrice += quantity * 2.00; // Example pricing
+    }
+
+    public int getTotalItems() {
+        return items.values().stream().mapToInt(Integer::intValue).sum();
+    }
+
+    public double getTotalPrice() {
+        return totalPrice;
+    }
+
+    public boolean containsItem(String item) {
+        return items.containsKey(item);
+    }
+}

testing-modules/groovy-spock/src/main/java/mocks/UtilityClass.java

@@ -0,0 +1,7 @@
+package mocks;
+
+public class UtilityClass {
+    public static String getMessage() {
+        return "Original Message";
+    }
+}