public async Task Should_map_originators_when_message_is_not_from_user() { var conferenceId = Guid.NewGuid(); var loggedInUser = "******"; var otherUsername = "******"; var messages = Builder <InstantMessageResponse> .CreateListOfSize(5) .TheFirst(2) .With(x => x.From = loggedInUser).TheNext(3) .With(x => x.From = otherUsername) .Build().ToList(); VideoApiClientMock.Setup(x => x.GetInstantMessageHistoryForParticipantAsync(conferenceId, loggedInUser)) .ReturnsAsync(messages); var result = await Controller.GetConferenceInstantMessageHistoryForParticipantAsync(conferenceId, loggedInUser); MessageDecoder.Verify(x => x.IsMessageFromUser( It.Is <InstantMessageResponse>(m => m.From == loggedInUser), loggedInUser), Times.Exactly(2)); MessageDecoder.Verify(x => x.IsMessageFromUser( It.Is <InstantMessageResponse>(m => m.From == otherUsername), loggedInUser), Times.Exactly(3)); var typedResult = (OkObjectResult)result; typedResult.Should().NotBeNull(); var responseModel = typedResult.Value as List <ChatResponse>; responseModel?.Count(x => x.FromDisplayName == "You").Should().Be(2); }