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Unit Test Comparing Results of List

Posted on 2013-06-17
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Last Modified: 2013-06-19
Hi Experts!

Thanks for reading this.

For MS Test project how would you compare that the two List of SomeModel have the same contents?

In the Test Method we have this:

List<SomeModel> expected = CreateExpectedSomeModel();
List<SomeModel> actual;

//If this was an array would use SequenceEqual
Assert.IsTrue(expected.SequenceEqual(actual));

TIA!
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Question by:allanau20
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Expert Comment

by:käµfm³d 👽
ID: 39255171
Use the CollectionAssert class. You can use the AreEqual method to check for the same elements, in the same order; you can use the AreEquivalent method to check for the same elements, but in any order.
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by:allanau20
ID: 39255176
Thanks kaufmed; I'll try it later .. I'm really heading out now ....
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Author Comment

by:allanau20
ID: 39257872
Tried AreEqual and this came up:

CollectionAssert.AreEqual failed. (Element at index 0 do not match.

Tried AreEquivalent failed and this came up:

CollectionAssert.AreEquivalent failed. The expected collection contains 1 occurrence(s) of <Blah.DomainClasses.SomeModel>. The actual collection contains 0 occurrence(s).

Manually inspected the contents of expected and actual (setting breakpoint) and the contents are the same.

Dumped contents of expected and actual to separate db tables and the contents are the same.

If it's any help here are the contents from the Intermediate windows during debugging:

?actual[0]
{Blah.DomainClasses.SomeModel}
    _Edate: "20781231"
    EDATE: "20781231"
    NEKEY: "0002-0800"
    SDATE: "19990201"
?expected[0]
{Blah.DomainClasses.SomeModel}
    _Edate: "20781231"
    EDATE: "20781231"
    NEKEY: "0002-0800"
    SDATE: "19990201"
    
?actual[1]
{Blah.DomainClasses.SomeModel}
    _Edate: "20221231"
    EDATE: "20221231"
    NEKEY: "52533-001"
    SDATE: "20100802"
?expected[1]
{Blah.DomainClasses.SomeModel}
    _Edate: "20221231"
    EDATE: "20221231"
    NEKEY: "52533-001"
    SDATE: "20100802"

?actual[2]
{Blah.DomainClasses.SomeModel}
    _Edate: "20781231"
    EDATE: "20781231"
    NEKEY: "24488-003"
    SDATE: "20110523"
?expected[2]
{Blah.DomainClasses.SomeModel}
    _Edate: "20781231"
    EDATE: "20781231"
    NEKEY: "24488-003"
    SDATE: "20110523"

?actual[3]
{Blah.DomainClasses.SomeModel}
    _Edate: "20781231"
    EDATE: "20781231"
    NEKEY: "24488-005"
    SDATE: "20100406"
?expected[3]
{Blah.DomainClasses.SomeModel}
    _Edate: "20781231"
    EDATE: "20781231"
    NEKEY: "24488-005"
    SDATE: "20100406"

?actual[4]
{Blah.DomainClasses.SomeModel}
    _Edate: "20781231"
    EDATE: "20781231"
    NEKEY: "54365-400"
    SDATE: "20000714"
?expected[4]
{Blah.DomainClasses.SomeModel}
    _Edate: "20781231"
    EDATE: "20781231"
    NEKEY: "54365-400"
    SDATE: "20000714"

?actual[5]
{Blah.DomainClasses.SomeModel}
    _Edate: "20781231"
    EDATE: "20781231"
    NEKEY: "52533-024"
    SDATE: "20110726"
?expected[5]
{Blah.DomainClasses.SomeModel}
    _Edate: "20781231"
    EDATE: "20781231"
    NEKEY: "52533-024"
    SDATE: "20110726"

?actual[6]
{Blah.DomainClasses.SomeModel}
    _Edate: "20170601"
    EDATE: "20170601"
    NEKEY: "0002-1200"
    SDATE: "20120601"
?expected[6]
{Blah.DomainClasses.SomeModel}
    _Edate: "20170601"
    EDATE: "20170601"
    NEKEY: "0002-1200"
    SDATE: "20120601"

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Any ideas?
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Author Comment

by:allanau20
ID: 39258100
Even if we do this:

List<SomeModel> expected = CreateExpectedSomeModel();
List<SomeModel> actual = CreateExpectedSomeModel();

And try to compare with either:

CollectionAssert.AreEquivalent(expected, actual);
CollectionAssert.AreEqual(expected, actual);


we still get the same errors.
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Accepted Solution

by:
käµfm³d   👽 earned 2000 total points
ID: 39258469
Hmmm...  The documentation for AreEquivalent seems to betray its actual operation. I'm not certain now that it will provide you with what you need.

Nevertheless, there is an overload of the AreEqual method that can take in an instance of an IComparer. You can use this overload to have AreEqual compare the properties of the classes that are within your list.

For example:

using Microsoft.VisualStudio.TestTools.UnitTesting;
using System.Collections;
using System.Collections.Generic;

namespace UnitTestProject1
{
    [TestClass]
    public class UnitTest1
    {
        public class Example
        {
            public string Property { get; set; }
        }

        public class ExampleComparer : IComparer<Example>, IComparer
        {
            public int Compare(Example x, Example y)
            {
                return x.Property.CompareTo(y.Property);
            }

            public int Compare(object x, object y)
            {
                Example castX = x as Example;
                Example castY = y as Example;

                if (castX == null || castY == null)
                {
                    return 0;
                }

                return Compare(castX, castY);
            }
        }

        [TestMethod]
        public void TestMethod1()
        {
            List<Example> expected = new List<Example>
            {
                new Example() { Property = "one" },
                new Example() { Property = "two" },
                new Example() { Property = "three" },
            };
            List<Example> actual = new List<Example>
            {
                new Example() { Property = "one" },
                new Example() { Property = "two" },
                new Example() { Property = "three" },
            };

            CollectionAssert.AreEqual(expected, actual, new ExampleComparer());
            //CollectionAssert.AreEqual(expected, actual);  // uncomment to see behavior when you don't use a Comparer
        }
    }
}

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Author Comment

by:allanau20
ID: 39258515
Thanks kaufmed; I'll try it when i get in..
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Author Closing Comment

by:allanau20
ID: 39260768
Thanks again kaufmed; really appreciate your help!!!!
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