public async Task ReadAsync_FillsBuffer()
{
// Arrange
var input = "Hello world";
var encoding = Encoding.Unicode;
var stream = new TranscodingReadStream(new MemoryStream(encoding.GetBytes(input)), encoding);
var bytes = new byte[3];
var expected = Encoding.UTF8.GetBytes(input.Substring(0, bytes.Length));
// Act
var readBytes = await stream.ReadAsync(bytes, 0, bytes.Length);
// Assert
Assert.Equal(3, readBytes);
Assert.Equal(expected, bytes);
Assert.Equal(0, stream.ByteBufferCount);
Assert.Equal(8, stream.CharBufferCount);
Assert.Equal(0, stream.OverflowCount);
}
public async Task ReadAsync_SingleByte()
{
// Arrange
var input = "Hello world";
var encoding = Encoding.Unicode;
var stream = new TranscodingReadStream(new MemoryStream(encoding.GetBytes(input)), encoding);
var bytes = new byte[4];
// Act
var readBytes = await stream.ReadAsync(bytes, 0, 1);
// Assert
Assert.Equal(1, readBytes);
Assert.Equal((byte)'H', bytes[0]);
Assert.Equal(0, bytes[1]);
Assert.Equal(0, stream.ByteBufferCount);
Assert.Equal(10, stream.CharBufferCount);
Assert.Equal(0, stream.OverflowCount);
}
private static async Task <TranscodingReadStream> ReadAsync_WithOverflowBufferAtCharBufferBoundaries(string input, int bufferSize)
{
// Arrange
// Test ensures that the overflow buffer works correctly
var encoding = Encoding.Unicode;
var stream = new TranscodingReadStream(new MemoryStream(encoding.GetBytes(input)), encoding);
var bytes = new byte[1];
var expected = Encoding.UTF8.GetBytes(input);
// Act
int read;
var buffer = new byte[bufferSize];
var actual = new List <byte>();
while ((read = await stream.ReadAsync(buffer)) != 0)
{
actual.AddRange(buffer);
}
Assert.Equal(expected, actual);
return(stream);
}
