public async Task DeleteAsync_Good()
{
var actionResult = await _target.DeleteAsync(new int[3]);
_mockMessageService.Verify(x => x.DeleteMessageAsync(It.IsAny <int>()), Times.Exactly(3));
Assert.IsType <OkObjectResult>(actionResult);
var result = actionResult as OkObjectResult;
Assert.Equal(200, result.StatusCode);
Assert.IsType <OperationDetails>(result.Value);
var details = result.Value as OperationDetails;
Assert.False(details.IsError);
Assert.Equal($"A set of entities of type '{typeof(Message)}' has been deleted successfully.",
details.Message);
}