public async Task UploadLeftDiff_success()
{
//Arrange
LeftDataViewModel fakeData = new LeftDataViewModel()
{
LeftData = "abcdefg"
};
_diffAppServiceMock.Setup(x => x.SaveLeftData(It.IsAny <LeftDataViewModel>()))
.Returns(Task.FromResult(new Guid()));
//Act
var diffController = new DiffController(_diffAppServiceMock.Object);
diffController.ControllerContext.HttpContext = _contextMock.Object;
var actionResult = await diffController.UploadLeftDiff(fakeData);
//Assert
Assert.Equal((actionResult as OkObjectResult).StatusCode, (int)System.Net.HttpStatusCode.OK);
}