fix: assert Camel route body as String after JSON marshalling

The route calls .marshal().json() before reaching the mock endpoint,
so the body is a JSON String, not a POJO. Removed expectedBodiesReceived
with POJO and getBody(BusinessRulesPayload.class), replaced with
String body assertion using contains().

docs/tr/skills/quarkus-tdd/SKILL.md

@@ -285,7 +285,6 @@ class BusinessRulesRouteTest {
       // ARRANGE
       MockEndpoint mockRabbitMQ = camelContext.getEndpoint("mock:rabbitmq", MockEndpoint.class);
       mockRabbitMQ.expectedMessageCount(1);
-      mockRabbitMQ.expectedBodiesReceived(testPayload);
       
       // Test için gerçek endpoint'i mock ile değiştir
       camelContext.getRouteController().stopRoute("business-rules-publisher");
@@ -298,12 +297,12 @@ class BusinessRulesRouteTest {
       // ACT
       producerTemplate.sendBody("direct:business-rules-publisher", testPayload);
       
-      // ASSERT
+      // ASSERT — .marshal().json() sonrası body JSON String'dir
       mockRabbitMQ.assertIsSatisfied(5000);
       
       assertThat(mockRabbitMQ.getExchanges()).hasSize(1);
-      assertThat(mockRabbitMQ.getExchanges().get(0).getIn().getBody(BusinessRulesPayload.class))
-          .isEqualTo(testPayload);
+      String body = mockRabbitMQ.getExchanges().get(0).getIn().getBody(String.class);
+      assertThat(body).contains("\"documentId\":1");
     }
 
     @Test