public async void GetAllTransactionsForYear_ShouldReturn200()
{
// Arrange
_mockService.Setup(_ => _.GetAllTransactionsForYear(It.IsAny <string>(), It.IsAny <string>(), It.IsAny <int>()))
.ReturnsAsync(It.IsAny <List <Transaction> >());
// Act
var result = await _controller.GetAllTransactionsForYear(It.IsAny <string>(), It.IsAny <string>(), It.IsAny <int>());
// Assert
_mockService.Verify(_ => _.GetAllTransactionsForYear(It.IsAny <string>(), It.IsAny <string>(), It.IsAny <int>()), Times.Once);
var actionResult = Assert.IsType <OkObjectResult>(result);
Assert.Equal(200, actionResult.StatusCode);
}