HP-1751 created AggregateNotDefinedException

Author: VadymHrechukha

src/Exception/LogicException.php

@@ -0,0 +1,8 @@
+<?php declare(strict_types=1);
+
+namespace hiqdev\php\billing\Exception;
+
+class LogicException extends \LogicException
+{
+
+}

src/product/AggregateNotDefinedException.php

@@ -0,0 +1,10 @@
+<?php declare(strict_types=1);
+
+namespace hiqdev\php\billing\product;
+
+use hiqdev\php\billing\Exception\LogicException;
+
+class AggregateNotDefinedException extends LogicException
+{
+
+}

src/product/ProductNotDefinedException.php

@@ -0,0 +1,10 @@
+<?php declare(strict_types=1);
+
+namespace hiqdev\php\billing\product;
+
+use hiqdev\php\billing\Exception\LogicException;
+
+class ProductNotDefinedException extends LogicException
+{
+
+}

src/product/ProductNotSetException.php

@@ -36,7 +36,7 @@ public function ofProduct(ProductInterface $product): TariffTypeDefinitionInterf
     public function getProduct(): ProductInterface
     {
         if ($this->product === null) {
-            throw new ProductNotSetException('Product is not set');
+            throw new ProductNotDefinedException('Product is not set. Call the ofProduct() method first.');
         }
 
         return $this->product;

src/product/TariffTypeDefinition.php

@@ -3,6 +3,7 @@
 namespace hiqdev\php\billing\product\price;
 
 use hiqdev\php\billing\product\AggregateInterface;
+use hiqdev\php\billing\product\AggregateNotDefinedException;
 use hiqdev\php\billing\product\behavior\BehaviorPriceTypeDefinitionCollection;
 use hiqdev\php\billing\product\invoice\InvoiceRepresentationCollection;
 use hiqdev\php\billing\product\ParentNodeDefinitionInterface;
@@ -32,7 +33,7 @@ class PriceTypeDefinition implements ParentNodeDefinitionInterface
 
     private BehaviorPriceTypeDefinitionCollection $behaviorCollection;
 
-    private AggregateInterface $aggregate;
+    private ?AggregateInterface $aggregate = null;
 
     public function __construct(
         /**
@@ -76,6 +77,7 @@ public function getDescription(): string
      * @param string $formatterClass
      * @param null|FractionUnitInterface|string $fractionUnit
      * @return $this
+     * @throws InvalidQuantityFormatterException
      */
     public function quantityFormatter(string $formatterClass, $fractionUnit = null): self
     {