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ByteWriterTests.cs
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using System;
using FluentAssertions;
using Xunit;
namespace NetCode.UnitTests;
public class ByteWriterTests
{
[Fact]
public void DefaultCtor_WriteULong_ArrayShouldContainBytes()
{
var byteWriter = new ByteWriter();
ulong value = 0b_11111111_00000000_11001100_00110011_10101010_01010101_11110000_00001111;
byteWriter.Write(value);
byteWriter.Count.Should().Be(8);
byteWriter.Array[0].Should().Be((byte) value);
byteWriter.Array[1].Should().Be((byte) (value >> 8));
byteWriter.Array[2].Should().Be((byte) (value >> 16));
byteWriter.Array[3].Should().Be((byte) (value >> 24));
byteWriter.Array[4].Should().Be((byte) (value >> 32));
byteWriter.Array[5].Should().Be((byte) (value >> 40));
byteWriter.Array[6].Should().Be((byte) (value >> 48));
byteWriter.Array[7].Should().Be((byte) (value >> 56));
}
[Fact]
public void DefaultCtor_WriteLong_ArrayShouldContainBytes()
{
var byteWriter = new ByteWriter();
long value = unchecked((long)0b_11111111_00000000_11001100_00110011_10101010_01010101_11110000_00001111);
byteWriter.Write(value);
byteWriter.Count.Should().Be(8);
byteWriter.Array[0].Should().Be((byte) value);
byteWriter.Array[1].Should().Be((byte) (value >> 8));
byteWriter.Array[2].Should().Be((byte) (value >> 16));
byteWriter.Array[3].Should().Be((byte) (value >> 24));
byteWriter.Array[4].Should().Be((byte) (value >> 32));
byteWriter.Array[5].Should().Be((byte) (value >> 40));
byteWriter.Array[6].Should().Be((byte) (value >> 48));
byteWriter.Array[7].Should().Be((byte) (value >> 56));
}
[Fact]
public void DefaultCtor_WriteUInt_ArrayShouldContainBytes()
{
var byteWriter = new ByteWriter();
uint value = 0b_10101010_01010101_11001100_11110000;
byteWriter.Write(value);
byteWriter.Count.Should().Be(4);
byteWriter.Array[0].Should().Be(0b11110000);
byteWriter.Array[1].Should().Be(0b11001100);
byteWriter.Array[2].Should().Be(0b01010101);
byteWriter.Array[3].Should().Be(0b10101010);
}
[Fact]
public void DefaultCtor_WriteInt_ArrayShouldContainBytes()
{
var byteWriter = new ByteWriter();
int value = unchecked((int)0b_10101010_01010101_11001100_11110000);
byteWriter.Write(value);
byteWriter.Count.Should().Be(4);
byteWriter.Array[0].Should().Be(0b11110000);
byteWriter.Array[1].Should().Be(0b11001100);
byteWriter.Array[2].Should().Be(0b01010101);
byteWriter.Array[3].Should().Be(0b10101010);
}
[Fact]
public void DefaultCtor_WriteUShort_ArrayShouldContainBytes()
{
var byteWriter = new ByteWriter();
ushort value = 0b_10101010_01010101;
byteWriter.Write(value);
byteWriter.Count.Should().Be(2);
byteWriter.Array[0].Should().Be(0b01010101);
byteWriter.Array[1].Should().Be(0b10101010);
}
[Fact]
public void DefaultCtor_WriteShort_ArrayShouldContainBytes()
{
var byteWriter = new ByteWriter();
short value = unchecked((short)0b_10101010_01010101);
byteWriter.Write(value);
byteWriter.Count.Should().Be(2);
byteWriter.Array[0].Should().Be(0b01010101);
byteWriter.Array[1].Should().Be(0b10101010);
}
[Fact]
public void DefaultCtor_WriteByte_ArrayShouldContainByte()
{
var byteWriter = new ByteWriter();
byte value = 0b10101010;
byteWriter.Write(value);
byteWriter.Count.Should().Be(1);
byteWriter.Array[0].Should().Be(0b10101010);
}
[Fact]
public void EmptyByteWriter_WriteByte_ExceptionExpected()
{
var emptyByteWriter = new ByteWriter(Array.Empty<byte>());
emptyByteWriter.Capacity.Should().Be(0);
Action action = () => emptyByteWriter.Write(byte.MaxValue);
action.Should().Throw<IndexOutOfRangeException>();
}
[Fact]
public void SizeOfArrayIs1Byte_WriteShort_ExceptionExpected()
{
var byteWriter = new ByteWriter(new byte[1]);
Action action = () => byteWriter.Write(short.MaxValue);
action.Should().Throw<IndexOutOfRangeException>();
}
[Fact]
public void EmptyByteWriter_SetNonEmptyArrayAndWriteShort_ArrayShouldContainBytes()
{
var byteWriter = new ByteWriter(Array.Empty<byte>());
byteWriter.SetArray(new byte[2]);
ushort value = 0b_10101010_01010101;
byteWriter.Write(value);
byteWriter.Count.Should().Be(2);
byteWriter.Array[0].Should().Be(0b_01010101);
byteWriter.Array[1].Should().Be(0b_10101010);
}
[Fact]
public void EmptyByteWriter_SetArrayWithZeroOffsetAndWriteShort_ArrayShouldContainBytes()
{
var byteWriter = new ByteWriter(Array.Empty<byte>());
byteWriter.SetArray(new byte[2], 0);
ushort value = 0b_10101010_01010101;
byteWriter.Write(value);
byteWriter.Count.Should().Be(2);
byteWriter.Array[0].Should().Be(0b_01010101);
byteWriter.Array[1].Should().Be(0b_10101010);
}
[Fact]
public void EmptyByteWriter_SetArrayWithNonZeroOffsetAndWriteShort_ArrayShouldContainBytes()
{
var byteWriter = new ByteWriter(Array.Empty<byte>());
byteWriter.SetArray(new byte[3], 1);
ushort value = 0b_10101010_01010101;
byteWriter.Write(value);
byteWriter.Count.Should().Be(3);
byteWriter.Array[0].Should().Be(0b_00000000);
byteWriter.Array[1].Should().Be(0b_01010101);
byteWriter.Array[2].Should().Be(0b_10101010);
}
[Fact]
public void EmptyByteWriter_SetArrayWithNonZeroOffsetAndWriteByte_ArrayShouldContainBytes()
{
var byteWriter = new ByteWriter(Array.Empty<byte>());
byteWriter.SetArray(new byte[3], 2);
byte value = 0b_10101010;
byteWriter.Write(value);
byteWriter.Count.Should().Be(3);
byteWriter.Array[0].Should().Be(0b_00000000);
byteWriter.Array[1].Should().Be(0b_00000000);
byteWriter.Array[2].Should().Be(0b_10101010);
}
[Fact]
public void EmptyByteWriter_SetArrayWithoutEmptySpaceAndWriteByte_ExceptionExpected()
{
var byteWriter = new ByteWriter(Array.Empty<byte>());
byteWriter.SetArray(new byte[3], 3);
Action action = () => byteWriter.Write(byte.MaxValue);
action.Should().Throw<IndexOutOfRangeException>();
}
[Fact]
public void EmptyByteWriter_SetArrayWithNonValidOffset_ExceptionExpected()
{
var byteWriter = new ByteWriter(Array.Empty<byte>());
Action action = () => byteWriter.SetArray(new byte[3], 4);
action.Should().Throw<ArgumentOutOfRangeException>();
}
[Fact]
public void SizeOfArrayIs1Byte_WriteByteAndClearAndWriteByte_ArrayShouldContainTheLastWrittenByte()
{
var byteWriter = new ByteWriter(new byte[1]);
byteWriter.Write(byte.MaxValue);
byteWriter.Clear();
byteWriter.Count.Should().Be(0);
byteWriter.Write((byte)0b_10101010);
byteWriter.Array[0].Should().Be(0b_10101010);
}
}