public async void CreateCase_ShouldCallService()
{
// Arrange
_mockService
.Setup(_ => _.CreateFeedbackCase(It.IsAny <FeedbackDetails>()))
.ReturnsAsync(It.IsAny <string>());
// Act
await _controller.CreateCase(It.IsAny <FeedbackDetails>());
// Assert
_mockService.Verify(_ => _.CreateFeedbackCase(It.IsAny <FeedbackDetails>()), Times.Once);
}