HP-2508 Support representations retrieval by price type

Author: SilverFire

src/product/Application/BillingRegistryService.php

@@ -27,11 +27,11 @@ public function __construct(private readonly BillingRegistryInterface $registry)
 
     public function getRepresentationsByType(string $representationClass): array
     {
-        if (!class_exists($representationClass)) {
+        if (!class_exists($representationClass) && !interface_exists($representationClass)) {
             throw new InvalidRepresentationException("Class '$representationClass' does not exist");
         }
 
-        if (!is_subclass_of($representationClass, RepresentationInterface::class)) {
+        if (class_exists($representationClass) && !is_subclass_of($representationClass, RepresentationInterface::class)) {
             throw new InvalidBehaviorException(
                 sprintf('Representation class "%s" does not implement RepresentationInterface', $representationClass)
             );

tests/unit/product/Application/BillingRegistryServiceTest.php

@@ -2,11 +2,14 @@
 
 namespace hiqdev\php\billing\tests\unit\product\Application;
 
+use hiqdev\billing\registry\invoice\InvoiceRepresentation;
+use hiqdev\billing\registry\invoice\PaymentRequestRepresentation;
 use hiqdev\php\billing\product\Application\BillingRegistryService;
 use hiqdev\php\billing\product\behavior\BehaviorNotFoundException;
 use hiqdev\php\billing\product\BillingRegistry;
 use hiqdev\php\billing\product\Exception\AggregateNotFoundException;
 use hiqdev\php\billing\product\invoice\InvalidRepresentationException;
+use hiqdev\php\billing\product\invoice\RepresentationInterface;
 use hiqdev\php\billing\product\TariffTypeDefinition;
 use hiqdev\php\billing\tests\unit\product\behavior\FakeBehavior;
 use hiqdev\php\billing\tests\unit\product\behavior\TestBehavior;
@@ -39,6 +42,28 @@ public function testGetAggregateThrowsExceptionWhenNotFound(): void
         $this->registryService->getAggregate('non-existent-type');
     }
 
+    public function testGetRepresentationsByInterfaceReturnsAllRepresentations(): void
+    {
+        $tariffType = new DummyTariffType();
+        $tariffTypeDefinition = new TariffTypeDefinition($tariffType);
+
+        $tariffTypeDefinition
+            ->withPrices()
+                ->priceType(Type::anyId('dummy'))
+                    ->documentRepresentation()
+                        ->attach(new InvoiceRepresentation("Invoice"))
+                        ->attach(new PaymentRequestRepresentation("Payment Request"))
+                    ->end()
+                ->end()
+            ->end();
+
+        $this->registry->addTariffType($tariffTypeDefinition);
+
+        $representations = $this->registryService->getRepresentationsByType(RepresentationInterface::class);
+
+        $this->assertCount(2, $representations);
+    }
+
     public function testGetBehavior(): void
     {
         $tariffType = new DummyTariffType();