tests/DotNetCommon.Test/Extensions/FileAndDirectoryExtensions/FileInfoStreamTests.cs

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namespace DotNetCommon.Test.Extensions.FileAndDirectoryExtensions
{
    using System.IO;
    using NUnit.Framework;
    using Shouldly;
    using DotNetCommon.Extensions;

    [TestFixture]
    internal sealed class FileInfoStreamTests
    {
        [Test]
        public void When_opening_or_creating_sequential_read_stream_for_a_non_existing_file()
        {
            FileInfo file = null;
            try
            {
                file = new FileInfo(Path.GetRandomFileName());
                file.Exists.ShouldBeFalse();

                using (var stream = file.OpenOrCreateSequentialRead())
                {
                    file.Refresh();
                    file.Exists.ShouldBeTrue();
                    stream.CanRead.ShouldBeTrue();
                    stream.CanWrite.ShouldBeFalse();
                    stream.Position.ShouldBe(0);
                }
            } finally
            {
                file?.Delete();
            }
        }

        [Test]
        public void When_opening_or_creating_sequential_read_stream_for_an_existing_file()
        {
            FileInfo file = null;
            try
            {
                file = new FileInfo(Path.GetTempFileName());
                file.Exists.ShouldBeTrue();

                using (var stream = file.OpenOrCreateSequentialRead())
                {
                    file.Refresh();
                    file.Exists.ShouldBeTrue();
                    stream.CanRead.ShouldBeTrue();
                    stream.CanWrite.ShouldBeFalse();
                    stream.Position.ShouldBe(0);
                }
            } finally
            {
                file?.Delete();
            }
        }

        [Test]
        public void When_opening_or_creating_sequential_write_stream_for_a_non_existing_file()
        {
            FileInfo file = null;