add test for DeliveryPayload deserialization

Author: jenschude

commercetools/commercetools-sdk-java-api/src/test/java/com/commercetools/MessagePayloadTest.java

@@ -9,6 +9,7 @@
 import com.commercetools.api.models.message.CustomerLastNameSetMessagePayload;
 import com.commercetools.api.models.message.MessagePayload;
 import com.commercetools.api.models.message.OrderCreatedMessagePayload;
+import com.commercetools.api.models.subscription.DeliveryPayload;
 import com.commercetools.api.models.subscription.MessageDeliveryPayload;
 
 import io.vrap.rmf.base.client.utils.json.JsonUtils;
@@ -38,4 +39,22 @@ public void deserializeMessageDeliveryPayload() {
         Assertions.assertThatThrownBy(() -> delivery.getMessagePayload().as(CustomerFirstNameSetMessagePayload.class))
                 .isInstanceOf(IllegalArgumentException.class);
     }
+
+    @Test
+    public void deserializeDeliveryPayload() {
+        DeliveryPayload delivery = JsonUtils.fromJsonString(stringFromResource("messagedeliverypayload.json"),
+            DeliveryPayload.class);
+
+        Assertions.assertThat(delivery).isInstanceOf(MessageDeliveryPayload.class);
+        MessageDeliveryPayload messageDelivery = (MessageDeliveryPayload) delivery;
+        Assertions.assertThat(messageDelivery.getMessagePayload())
+                .isInstanceOf(CustomerLastNameSetMessagePayload.class);
+        Assertions.assertThat(messageDelivery.getMessagePayload().as(CustomerLastNameSetMessagePayload.class))
+                .isInstanceOf(CustomerLastNameSetMessagePayload.class);
+        Assertions.assertThat(messageDelivery.hasCompleteMessage()).isTrue();
+        Assertions
+                .assertThatThrownBy(
+                    () -> messageDelivery.getMessagePayload().as(CustomerFirstNameSetMessagePayload.class))
+                .isInstanceOf(IllegalArgumentException.class);
+    }
 }