squidex/backend/tests/Squidex.Infrastructure.Tests/Collections/ReadonlyListTests.cs

// ==========================================================================
//  Squidex Headless CMS
// ==========================================================================
//  Copyright (c) Squidex UG (haftungsbeschraenkt)
//  All rights reserved. Licensed under the MIT license.
// ==========================================================================

using Squidex.Infrastructure.TestHelpers;
using Xunit;

namespace Squidex.Infrastructure.Collections
{
    public class ReadonlyListTests
    {
        internal sealed class Inherited : ReadonlyList<int>
        {
            public Inherited(IList<int> inner)
                : base(inner)
            {
            }
        }

        [Fact]
        public void Should_return_empty_instance_for_empty_array()
        {
            var result = ReadonlyList.Create<int>();

            Assert.Same(ReadonlyList.Empty<int>(), result);
        }

        [Fact]
        public void Should_return_empty_instance_for_null_array()
        {
            var result = ReadonlyList.Create((int[]?)null);

            Assert.Same(ReadonlyList.Empty<int>(), result);
        }

        [Fact]
        public void Should_return_empty_instance_for_empty_enumerable()
        {
            var result = Enumerable.Empty<int>().ToReadonlyList();

            Assert.Same(ReadonlyList.Empty<int>(), result);
        }

        [Fact]
        public void Should_make_correct_equal_comparisons()
        {
            var list1a = ReadonlyList.Create(1);
            var list1b = ReadonlyList.Create(1);

            var listOtherValue = ReadonlyList.Create(2);
            var listOtherSize = ReadonlyList.Create(1, 2);

            Assert.Equal(list1a, list1b);
            Assert.Equal(list1a.GetHashCode(), list1b.GetHashCode());
            Assert.True(list1a.Equals((object)list1b));

            Assert.NotEqual(list1a, listOtherValue);
            Assert.NotEqual(list1a.GetHashCode(), listOtherValue.GetHashCode());
            Assert.False(list1a.Equals((object)listOtherValue));

            Assert.NotEqual(list1a, listOtherSize);
            Assert.NotEqual(list1a.GetHashCode(), listOtherSize.GetHashCode());
            Assert.False(list1a.Equals((object)listOtherSize));
        }

        [Fact]
        public void Should_serialize_and_deserialize()
        {
            var sut = new List<int>
            {
                1,
                2,
                3
            }.ToReadonlyList();

            var serialized = sut.SerializeAndDeserialize();

            Assert.Equal(sut, serialized);
        }

        [Fact]
        public void Should_serialize_and_deserialize_inherited()
        {
            var sut = new Inherited(new List<int>
            {
                1,
                2,
                3
            });

            var serialized = sut.SerializeAndDeserialize();

            Assert.Equal(sut, serialized);
        }
    }
}