Kavita/API.Tests/Extensions/FileInfoExtensionsTests.cs

using System;
using System.Globalization;
using System.IO;
using API.Extensions;
using Xunit;

namespace API.Tests.Extensions
{
    public class FileInfoExtensionsTests
    {
        private static readonly string TestDirectory = Path.Join(Directory.GetCurrentDirectory(), "../../../Extensions/Test Data/");

        [Fact]
        public void HasFileBeenModifiedSince_ShouldBeFalse()
        {
            var filepath = Path.Join(TestDirectory, "not modified.txt");
            var date = new FileInfo(filepath).LastWriteTime;
            Assert.False(new FileInfo(filepath).HasFileBeenModifiedSince(date));
            File.ReadAllText(filepath);
            Assert.False(new FileInfo(filepath).HasFileBeenModifiedSince(date));
        }

        [Fact]
        public void HasFileBeenModifiedSince_ShouldBeTrue()
        {
            var filepath = Path.Join(TestDirectory, "modified on run.txt");
            var date = new FileInfo(filepath).LastWriteTime;
            Assert.False(new FileInfo(filepath).HasFileBeenModifiedSince(date));
            File.AppendAllLines(filepath, new[] { DateTime.Now.ToString(CultureInfo.InvariantCulture) });
            Assert.True(new FileInfo(filepath).HasFileBeenModifiedSince(date));
        }
    }
}