C# compare lists List<T>

Question

using Microsoft.VisualStudio.TestTools.UnitTesting;

I want universal test method, which gets Dictionary and function, and then check equality for each dictionary entry between Value and function(Key):

public void TestMethod<TKey, TValue>(Dictionary<TKey, TValue> dict, Func<TKey, TValue> func)
{
    foreach (var test in dict)
    {
         Assert.AreEqual(test.Value, func(test.Key));
    }
}

But if Values (and return value of function) is

List<int>

it doesnt work, of course. So, I found than I need

CollectionAssert.AreEqual

for such cases. But now I have to say, that my value is System.Collections.ICollection. How to do this?

Answer 1

You need to cast the values to ICollection so the compiler won't complain.

public void TestMethod<TKey, TValue>(Dictionary<TKey, TValue> dict, Func<TKey, TValue> func)
{
    foreach (var test in dict)
    {
         if (test.Value is ICollection)
         {
              CollectionAssert.AreEqual((ICollection)test.Value, (ICollection)func(test.Key));
         }
         else
         {
              Assert.AreEqual(test.Value, func(test.Key));
         }
    }
}