Unit testing with NUnit

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testing

C#5.0

NUnit

unit-testing

I am using the NUnit framework for unit testing.

My question is that in NUnit I am getting the error "MolopolyGame.Testing._Card.TestConstructor:
No arguments were provided"

The method which i am testing returns a random item in an array.

I have a method which i need to test

public string GetCommunityCard()
        {
            //generate random community card
            int card;
            Random randomCommunityCard = new Random();
            card = randomCommunityCard.Next(communityChestCardArray.Length);
            return communityChestCardArray[card];
        }

and this is the test that I have written so far for the method

namespace MolopolyGame.Testing
{
    [TestFixture]
    public class _Card
    {
        [Test]
        public void TestConstructor(string retArray)
        {
            Card Card = new Card();
            string myCard = Card.GetCommunityCard();

            Assert.AreEqual(myCard, retArray);
        }
    }
}

I am not too sure what I am doing wrong?

Thank you