algorithms-and-data-structures/AlgorithmsAndDataStructures.Tests/DataStructures/Cache/LRUTests.cs at master · arst/algorithms-and-data-structures · GitHub

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using System.Globalization;
using AlgorithmsAndDataStructures.DataStructures.Cache;
using Xunit;

namespace AlgorithmsAndDataStructures.Tests.DataStructures.Cache;

public class LruTests
{
    [Fact]
    public void CanInsertEntry()
    {
        var sut = new Lru(1);
        sut.Add(1, "Test");
    }

    [Fact]
    public void CanGetEntry()
    {
        var sut = new Lru(1);
        sut.Add(1, "Test");

        Assert.Equal("Test", sut.Get(1));
    }

    [Fact]
    public void CanUpdateEntry()
    {
        var sut = new Lru(1);
        sut.Add(1, "Test");
        sut.Add(1, "Test1");

        Assert.Equal("Test1", sut.Get(1));
    }

    [Fact]
    public void LeastRecentlyUsedEntryRemoved()
    {
        var sut = new Lru(1);
        sut.Add(1, "Test");
        sut.Add(2, "Test1");

        Assert.Null(sut.Get(1));
        Assert.Equal("Test1", sut.Get(2));
    }

    [Fact]
    public void Fuzzy()
    {
        const int testCaseSize = 1000;
        var sut = new Lru(testCaseSize);

        for (var i = 0; i < testCaseSize; i++) sut.Add(i, i.ToString(CultureInfo.InvariantCulture));

        for (var i = testCaseSize; i < testCaseSize * 2; i++)
        {
            sut.Add(i, i.ToString(CultureInfo.InvariantCulture));
            Assert.Null(sut.Get(i - testCaseSize));
        }
    }
}