moq mongodb InsertOneAsync method - mongodb

Question

I am using Mongodb database with .net core. I just want to moq insert method that using mongodbContext. Here is what I am trying to do but it's not working:
public void InsertEventAsync_Test()
{
//Arrange
var eventRepository = EventRepository();
var pEvent = new PlanEvent
{
ID = "testEvent",
WorkOrderID = "WorkOrderID",
IsDeleted = false,
IsActive = true,
EquipmentID = "EquipmentID"
};
////Act
//mockEventContext.Setup(mr => mr.PlanEvent.InsertOne(It.IsAny<PlanEvent>(), It.IsAny<InsertOneOptions>()))
mockEventContext.Setup(s => s.PlanEvent.InsertOneAsync(It.IsAny<PlanEvent>(), It.IsAny<InsertOneOptions>())).Returns("sdad");
var result = eventRepository.InsertEventAsync(pEvent);
////Assert
result.Should().NotBeNull();
}
Below is the method that I need to Moq:
public EventRepository(IFMPContext eventContext)
{
_eventContext = eventContext;
}
public async Task<string> InsertEventAsync(Model.EventDataModel.PlanEvent eventobj)
{
eventobj._id = ObjectId.GenerateNewId();
eventobj.CreatedDateTime = DateTime.UtcNow.ToString();
try
{
_eventContext.PlanEvent.InsertOne(eventobj);
return eventobj.ID;
}
catch (Exception ex)
{
string x = ex.Message;
}
return "";
}

Answer 1

Assuming
public class EventRepository {
private readonly IFMPContext eventContext;
public EventRepository(IFMPContext eventContext) {
this.eventContext = eventContext;
}
public async Task<string> InsertEventAsync(Model.EventDataModel.PlanEvent eventobj) {
eventobj._id = ObjectId.GenerateNewId();
eventobj.CreatedDateTime = DateTime.UtcNow.ToString();
try {
await eventContext.PlanEvent.InsertOneAsync(eventobj);
return eventobj.ID;
} catch (Exception ex) {
string x = ex.Message;
}
return "";
}
}
You need to configure the test to support the async nature of the method under test
public async Task InsertEventAsync_Test()
{
//Arrange
var expected = "testEvent";
var pEvent = new PlanEvent {
ID = expected,
WorkOrderID = "WorkOrderID",
IsDeleted = false,
IsActive = true,
EquipmentID = "EquipmentID"
};
var mockEventContext = new Mock<IFMPContext>();
mockEventContext
.Setup(_ => _.PlanEvent.InsertOneAsync(It.IsAny<PlanEvent>(), It.IsAny<InsertOneOptions>()))
.ReturnsAsync(Task.FromResult((object)null));
var eventRepository = new EventRepository(mockEventContext.Object);
//Act
var actual = await eventRepository.InsertEventAsync(pEvent);
//Assert
actual.Should().NotBeNull()
actual.Should().Be(expected);
}
The test method definition needed to be updated to be asynchronous to allow the method under test to be awaited. The mock dependency also needed to be setup in such a way to allow the async flow to continue as expected when invoked.

Answer 2

#Nkosi Thanks a lot for your help. Finally i found the way. i was missing extra moq param It.IsAny<System.Threading.CancellationToken>() below is the working test
public void InsertEventAsync_Test()
{
//Arrange
var eventRepository = EventRepository();
var pEvent = new PlanEvent
{
ID = "testEvent",
WorkOrderID = "WorkOrderID",
IsDeleted = false,
IsActive = true,
EquipmentID = "EquipmentID"
};
////Act
mockEventContext.Setup(s => s.PlanEvent.InsertOne(It.IsAny<PlanEvent>(), It.IsAny<InsertOneOptions>(),It.IsAny<System.Threading.CancellationToken>()));
var result = eventRepository.InsertEventAsync(pEvent);
////Assert
result.Should().NotBeNull();
Assert.AreEqual(pEvent.ID, result);
}