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Add LittleEndianBitConverter tests

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James Jackson-South 10 years ago
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  1. 109
      tests/ImageSharp.Tests/IO/LittleEndianBitConverterTests.cs

109
tests/ImageSharp.Tests/IO/LittleEndianBitConverterTests.cs
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// <copyright file="LittleEndianBitConverterTests.cs" company="James Jackson-South">
// Copyright (c) James Jackson-South and contributors.
// Licensed under the Apache License, Version 2.0.
// </copyright>
namespace ImageSharp.Tests.IO
{
using ImageSharp.IO;
using Xunit;
/// <summary>
/// The <see cref="LittleEndianBitConverter"/> tests.
/// </summary>
public class LittleEndianBitConverterTests
{
/// <summary>
/// Tests that passing a <see cref="short"/> returns the correct bytes.
/// </summary>
[Fact]
public void GetBytesShort()
{
this.CheckBytes(new byte[] { 0, 0 }, EndianBitConverter.Little.GetBytes((short)0));
this.CheckBytes(new byte[] { 1, 0 }, EndianBitConverter.Little.GetBytes((short)1));
this.CheckBytes(new byte[] { 0, 1 }, EndianBitConverter.Little.GetBytes((short)256));
this.CheckBytes(new byte[] { 255, 255 }, EndianBitConverter.Little.GetBytes((short)-1));
this.CheckBytes(new byte[] { 1, 1 }, EndianBitConverter.Little.GetBytes((short)257));
}
/// <summary>
/// Tests that passing a <see cref="int"/> returns the correct bytes.
/// </summary>
[Fact]
public void GetBytesInt()
{
this.CheckBytes(new byte[] { 0, 0, 0, 0 }, EndianBitConverter.Little.GetBytes((int)0));
this.CheckBytes(new byte[] { 1, 0, 0, 0 }, EndianBitConverter.Little.GetBytes((int)1));
this.CheckBytes(new byte[] { 0, 1, 0, 0 }, EndianBitConverter.Little.GetBytes((int)256));
this.CheckBytes(new byte[] { 0, 0, 1, 0 }, EndianBitConverter.Little.GetBytes((int)65536));
this.CheckBytes(new byte[] { 0, 0, 0, 1 }, EndianBitConverter.Little.GetBytes((int)16777216));
this.CheckBytes(new byte[] { 255, 255, 255, 255 }, EndianBitConverter.Little.GetBytes((int)-1));
this.CheckBytes(new byte[] { 1, 1, 0, 0 }, EndianBitConverter.Little.GetBytes((int)257));
}
/// <summary>
/// Tests that passing a <see cref="uint"/> returns the correct bytes.
/// </summary>
[Fact]
public void GetBytesUInt()
{
this.CheckBytes(new byte[] { 0, 0, 0, 0 }, EndianBitConverter.Little.GetBytes((uint)0));
this.CheckBytes(new byte[] { 1, 0, 0, 0 }, EndianBitConverter.Little.GetBytes((uint)1));
this.CheckBytes(new byte[] { 0, 1, 0, 0 }, EndianBitConverter.Little.GetBytes((uint)256));
this.CheckBytes(new byte[] { 0, 0, 1, 0 }, EndianBitConverter.Little.GetBytes((uint)65536));
this.CheckBytes(new byte[] { 0, 0, 0, 1 }, EndianBitConverter.Little.GetBytes((uint)16777216));
this.CheckBytes(new byte[] { 255, 255, 255, 255 }, EndianBitConverter.Little.GetBytes((uint)uint.MaxValue));
this.CheckBytes(new byte[] { 1, 1, 0, 0 }, EndianBitConverter.Little.GetBytes((uint)257));
}
/// <summary>
/// Tests that passing a <see cref="long"/> returns the correct bytes.
/// </summary>
[Fact]
public void GetBytesLong()
{
this.CheckBytes(new byte[] { 0, 0, 0, 0, 0, 0, 0, 0 }, EndianBitConverter.Little.GetBytes(0L));
this.CheckBytes(new byte[] { 1, 0, 0, 0, 0, 0, 0, 0 }, EndianBitConverter.Little.GetBytes(1L));
this.CheckBytes(new byte[] { 0, 1, 0, 0, 0, 0, 0, 0 }, EndianBitConverter.Little.GetBytes(256L));
this.CheckBytes(new byte[] { 0, 0, 1, 0, 0, 0, 0, 0 }, EndianBitConverter.Little.GetBytes(65536L));
this.CheckBytes(new byte[] { 0, 0, 0, 1, 0, 0, 0, 0 }, EndianBitConverter.Little.GetBytes(16777216L));
this.CheckBytes(new byte[] { 0, 0, 0, 0, 1, 0, 0, 0 }, EndianBitConverter.Little.GetBytes(4294967296L));
this.CheckBytes(new byte[] { 0, 0, 0, 0, 0, 1, 0, 0 }, EndianBitConverter.Little.GetBytes(1099511627776L));
this.CheckBytes(new byte[] { 0, 0, 0, 0, 0, 0, 1, 0 }, EndianBitConverter.Little.GetBytes(1099511627776L * 256));
this.CheckBytes(new byte[] { 0, 0, 0, 0, 0, 0, 0, 1 }, EndianBitConverter.Little.GetBytes(1099511627776L * 256 * 256));
this.CheckBytes(new byte[] { 255, 255, 255, 255, 255, 255, 255, 255 }, EndianBitConverter.Little.GetBytes(-1L));
this.CheckBytes(new byte[] { 1, 1, 0, 0, 0, 0, 0, 0 }, EndianBitConverter.Little.GetBytes(257L));
}
/// <summary>
/// Tests that passing a <see cref="ulong"/> returns the correct bytes.
/// </summary>
[Fact]
public void GetBytesULong()
{
this.CheckBytes(new byte[] { 0, 0, 0, 0, 0, 0, 0, 0 }, EndianBitConverter.Little.GetBytes(0UL));
this.CheckBytes(new byte[] { 1, 0, 0, 0, 0, 0, 0, 0 }, EndianBitConverter.Little.GetBytes(1UL));
this.CheckBytes(new byte[] { 0, 1, 0, 0, 0, 0, 0, 0 }, EndianBitConverter.Little.GetBytes(256UL));
this.CheckBytes(new byte[] { 0, 0, 1, 0, 0, 0, 0, 0 }, EndianBitConverter.Little.GetBytes(65536UL));
this.CheckBytes(new byte[] { 0, 0, 0, 1, 0, 0, 0, 0 }, EndianBitConverter.Little.GetBytes(16777216UL));
this.CheckBytes(new byte[] { 0, 0, 0, 0, 1, 0, 0, 0 }, EndianBitConverter.Little.GetBytes(4294967296UL));
this.CheckBytes(new byte[] { 0, 0, 0, 0, 0, 1, 0, 0 }, EndianBitConverter.Little.GetBytes(1099511627776UL));
this.CheckBytes(new byte[] { 0, 0, 0, 0, 0, 0, 1, 0 }, EndianBitConverter.Little.GetBytes(1099511627776UL * 256));
this.CheckBytes(new byte[] { 0, 0, 0, 0, 0, 0, 0, 1 }, EndianBitConverter.Little.GetBytes(1099511627776UL * 256 * 256));
this.CheckBytes(new byte[] { 255, 255, 255, 255, 255, 255, 255, 255 }, EndianBitConverter.Little.GetBytes(ulong.MaxValue));
this.CheckBytes(new byte[] { 1, 1, 0, 0, 0, 0, 0, 0 }, EndianBitConverter.Little.GetBytes(257UL));
}
/// <summary>
/// Tests the two byte arrays for equality.
/// </summary>
/// <param name="expected">The expected bytes.</param>
/// <param name="actual">The actual bytes.</param>
private void CheckBytes(byte[] expected, byte[] actual)
{
Assert.Equal(expected.Length, actual.Length);
Assert.Equal(expected, actual);
}
}
}
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