Net Core: Declare and Initialize new Enumerable in Moq statement

Question

I am trying to declare and initialize an empty IEnumerable in a Moq statement. For some reason the last part where I try to declare ProductResult as Enumerable is failing. Can i do this inline with Moq statement?

mock.Setup(b => b.GetProductStatus(It.IsAny<bool>())).Returns(new List<ProductResult>().AsEnumerable() { });

Trying to research this article:

IEnumerable<object> a = new IEnumerable<object>(); Can I do this?

u cant initialise an ienumerable. Its an interface – Gauravsa Sep 19 '19 at 03:29 — Gauravsa, Sep 19 '19 at 03:29
use `.Returns(Enumerable.Empty())` – fenixil Sep 19 '19 at 03:55 — fenixil, Sep 19 '19 at 03:55
hi @Fenixil feel free to write in answer also, thanks ! – Sep 19 '19 at 03:56 — , Sep 19 '19 at 03:56

score 0 · Answer 1 · answered Sep 19 '19 at 03:35

0

I can only make a wild guess with this limited info. Can you please remove .AsEnumerable() { } and see?

The {} is odd and it's not proper C# code.
List implements IEnumerable so you don't need the .AsEnumerable()

answered Sep 19 '19 at 03:35

sidecus

732
5
10

score 0 · Accepted Answer · answered Sep 19 '19 at 03:40

You moq should look like this. No need to do AsEnumerable as List is an implementation of IEnumerable.

 mock.Setup(x => x.GetProductStatus(It.IsAny<bool>()))
.Returns(new List<ProductResult>());

You method I beleive looks like this:

IEnumerable<ProductResult> GetProductStatus(bool someValue);

With a list you can do things like Count, Linq Any etc.

For further info, Quickstart is a good reference. Link here: https://code.google.com/archive/p/moq/wikis/QuickStart.wiki

score 0 · Answer 3 · edited Oct 04 '20 at 14:55

0

If you just need to return empty IEnumerable you can use Enumerable.Empty. If you need non empty collection, then you can return any, because all of them implement IEnumerable.

.Returns(Enumerable.Empty<ProductResult>())
.Returns(new[] {1, 2, 3})

edited Oct 04 '20 at 14:55

marc_s

732,580
175
1,330
1,459

answered Sep 19 '19 at 04:01

fenixil

2,106
7
13

Net Core: Declare and Initialize new Enumerable in Moq statement

3 Answers3