AbstractRivalsTest.cs

using System.Collections.Generic;
using System.Linq;
using NUnit.Framework;

namespace Rivals
{
    public class AbstractRivalsTest
    {
        protected static void AssertResult(IEnumerable<OwnedLocation> expectedResult, IEnumerable<OwnedLocation> actualResult)
        {
            var actual = actualResult.ToLookup(l => l.Location);
            var expected = expectedResult.ToDictionary(l => l.Location);
            foreach (var expectedLocation in expected)
            {
                var actualLocation = actual[expectedLocation.Key].ToArray();
                if (actualLocation.Length > 1)
                {
                    var allActual = string.Join<OwnedLocation>(", ", actualLocation);
                    Assert.Fail($"Multiple OwnedLocation's with same location {expectedLocation.Key}: {allActual}");
                }
                if (actualLocation.Length == 0)
                {
                    Assert.Fail($"Not found OwnedLocation with location: {expectedLocation.Key}");
                }
                Assert.AreEqual(expectedLocation.Value, actualLocation[0]);
            }
            foreach (var location in actual)
            {
                if (!expected.ContainsKey(location.Key))
                    Assert.Fail($"Found extra OwnedLocation: {location.First()}");
            }
        }

    }
}