Unit-testing IList with CollectionAssert

Question

The MSTest framework has a CollectionAssert that accepts ICollections. My method returns an IList. Apparently a list is not a collection..

Are there ways to make my IList an ICollection?

The connect issue for this. Usual Microsoft response, tsss. https://connect.microsoft.com/VisualStudio/feedback/details/477870/collectionassert-cannot-be-used-with-hashset-t-and-possibly-other-collections# — Rudi, Jun 08 '12 at 12:28

Lee · Accepted Answer · 2009-03-19T14:57:33.487

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You could call the ToArray() extension method on it - Array implements ICollection

Edit: Also, while List<T> implements ICollection, IList<T> only implements ICollection<T> which does not implement ICollection, so if you know the item in the test is a List<T>, you should be able to cast it...

edited Mar 19 '09 at 14:57

answered Mar 19 '09 at 14:43

Lee

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I think IEnumerable for the parameters would have been a better choice. NUnit has got this one right. – Gishu Nov 09 '11 at 06:16

score 1 · Answer 2 · edited Nov 08 '11 at 13:54

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You can send in a List

    List<string> actual = new List<string>(){"1","2","3"};
    List<string> expected = new List<string>(){"1","2","**EditCaseFalse**"};
    CollectionAssert.AreEqual(actual,expected)

I get back Failed (third element does not match.)

edited Nov 08 '11 at 13:54

Boris Callens

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answered Apr 20 '09 at 18:27

salgo60

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and how exactly is this related to the question? – Boris Callens Apr 21 '09 at 07:32
I send in two list (IList) that are compared in CollectionAssert is that your problem... – salgo60 Apr 21 '09 at 21:47
I'm sorry, I didn't read in enough on your answer. Please refer @Lee's answer about why this is working but not a solution to my problem. – Boris Callens Nov 08 '11 at 13:50
I edited your answer to remove a bit of noise so the actual answer is clearer. If you mind, please feel free to roll back. – Boris Callens Nov 08 '11 at 13:55

Unit-testing IList with CollectionAssert

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