MS Test failing with a collection

Question

I'm starting with MS Test and trying to run following test. I see following part gives me a fail, which is quite suprising:

    [TestMethod]
    public void EachRetailerPassedToBuilderIsReturnedInVmList()
    {
        List<string> mockRetailers = new List<string> { "Asda", "Tesco" };

        Assert.AreEqual(new List<string>{ "Asda", "Tesco"}, mockRetailers);

    }

What am I doing wrong?

Result Message: Assert.AreEqual failed. Expected:.

score 1 · Accepted Answer · edited May 23 '17 at 11:59

1

The problem is that List<T>.Equals does not provide elementwise check of data. It will only compare references. Quick solution would be to iterate through data and Assert.Equals on each element. Remember though to check if list sizes are equal beforehand.

It is also possible to use CollectionAssert.AreEqual to get appropriate result.

How to compare Lists in Unit Testing

edited May 23 '17 at 11:59

Community

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answered Apr 01 '16 at 22:29

bottaio

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http://stackoverflow.com/questions/11055632/how-to-compare-lists-in-unit-testing – Turo Apr 01 '16 at 22:34
actually it looks like this is a duplicate question, which I did not see before. The CollectionAssert worked for me. – Turo Apr 01 '16 at 22:35
Oh. I have completely forgotten about CollectionAssert. – bottaio Apr 01 '16 at 22:51

MS Test failing with a collection

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