public async void GetDocumentForAccount_ShouldCallService()
{
// Arrange
_mockService.Setup(_ => _.GetDocumentForAccount(It.IsAny <string>(), It.IsAny <string>(), It.IsAny <string>()))
.ReturnsAsync(new byte[5]);
// Act
var result = await _controller.GetDocumentForAccount(It.IsAny <string>(), It.IsAny <string>(), It.IsAny <string>());
// Assert
_mockService.Verify(_ => _.GetDocumentForAccount(It.IsAny <string>(), It.IsAny <string>(), It.IsAny <string>()), Times.Once);
var actionResult = Assert.IsType <FileContentResult>(result);
Assert.NotNull(actionResult);
}