// Copyright Dirk Lemstra https://github.com/dlemstra/Magick.NET.
// Licensed under the Apache License, Version 2.0.

using ImageMagick;
using Xunit;

namespace Magick.NET.Core.Tests;

public partial class EndianReaderTests
{
    public class TheReadShortMethod : EndianReaderTests
    {
        [Fact]
        public void ShouldReturnNullWhenBufferIsNotLongEnough()
        {
            var reader = new EndianReader(new byte[1] { 0 });

            var result = reader.ReadShort();

            Assert.Null(result);
        }

        [Fact]
        public void ShouldReadShortBigEndian()
        {
            var reader = new EndianReader(new byte[2] { 178, 164 });

            var result = reader.ReadShort();

            Assert.Equal((ushort)45732, result);
        }

        [Fact]
        public void ShouldReadShortLittleEndian()
        {
            var reader = new EndianReader(new byte[2] { 164, 178 });
            reader.IsLittleEndian = true;

            var result = reader.ReadShort();

            Assert.Equal((ushort)45732, result);
        }

        [Fact]
        public void ShouldChangeTheIndex()
        {
            var reader = new EndianReader(new byte[2] { 0, 0 });

            reader.ReadShort();

            Assert.Equal(2U, reader.Index);
        }
    }
}
