public async void GetSessionById_not_found()
{
// Arrange
int sessionId = int.MinValue;
// Act
var actionResult = await controller.GetSessionById(sessionId);
// Assert
var notFoundObjectResult = Assert.IsType <NotFoundObjectResult>(actionResult);
var result = Assert.IsAssignableFrom <int>(notFoundObjectResult.Value);
Assert.Equal(sessionId, result);
}