public async Task TestCustomJsonSerializer()
{
int toStreamCount = 0;
int fromStreamCount = 0;
Mock <CosmosJsonSerializer> mockJsonSerializer = new Mock <CosmosJsonSerializer>();
//The item object will be serialized with the custom json serializer.
ToDoActivity testItem = CreateRandomToDoActivity();
mockJsonSerializer.Setup(x => x.ToStream <ToDoActivity>(It.IsAny <ToDoActivity>())).Callback(() => toStreamCount++).Returns(this.jsonSerializer.ToStream <ToDoActivity>(testItem));
mockJsonSerializer.Setup(x => x.FromStream <ToDoActivity>(It.IsAny <Stream>())).Callback <Stream>(x => { x.Dispose(); fromStreamCount++; }).Returns(testItem);
//Create a new cosmos client with the mocked cosmos json serializer
CosmosConfiguration configuration = TestCommon.GetDefaultConfiguration();
configuration.UseCustomJsonSerializer(mockJsonSerializer.Object);
CosmosClient mockClient = TestCommon.CreateCosmosClient(configuration);
CosmosContainer mockContainer = mockClient.Databases[this.database.Id].Containers[this.container.Id];
//Validate that the custom json serializer is used for creating the item
CosmosItemResponse <ToDoActivity> response = await mockContainer.Items.CreateItemAsync <ToDoActivity>(partitionKey : testItem.status, item : testItem);
Assert.IsNotNull(response);
Assert.AreEqual(HttpStatusCode.Created, response.StatusCode);
Assert.AreEqual(1, toStreamCount);
Assert.AreEqual(1, fromStreamCount);
await mockContainer.Items.DeleteItemAsync <ToDoActivity>(testItem.status, testItem.id);
}
