Added validation of amount and days parameters in fridge to not take negative numbers

src/main/java/ntnu/idatt2016/v233/SmartMat/controller/group/FridgeController.java

@@ -59,7 +59,11 @@ public class FridgeController {
      */
     @PostMapping("/group/product")
     public ResponseEntity<Product> addProductToFridge(@RequestBody FridgeProductRequest request) {
-        return fridgeService.addProductToFridge(request).map(ResponseEntity::ok).orElseGet(()-> ResponseEntity.notFound().build());
+        try {
+            return fridgeService.addProductToFridge(request).map(ResponseEntity::ok).orElseGet(() -> ResponseEntity.notFound().build());
+        } catch (IllegalArgumentException e) {
+            return ResponseEntity.badRequest().build();
+        }
     }
 
     @PutMapping("/group/product")

src/main/java/ntnu/idatt2016/v233/SmartMat/service/group/FridgeService.java

@@ -70,6 +70,10 @@ public class FridgeService {
      * @return the product that was added to the fridge
      */
     public Optional<Product> addProductToFridge(FridgeProductRequest fridgeProductRequest) {
+        if (fridgeProductRequest.amount() < 0 || fridgeProductRequest.days() < 0) {
+            throw new IllegalArgumentException("Amount and days must be non-negative values.");
+        }
+
         Optional<Product> product = productService.getProductById(fridgeProductRequest.ean());
         Optional<Fridge> fridge = fridgeRepository.findByGroupGroupId(fridgeProductRequest.groupId());
         double price = 100.0;