public void BackpatchSize_should_backpatch_the_size(
[Values(0, 1, 5)]
int startPosition)
{
var bytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
var length = bytes.Length - startPosition;
var expectedBytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
Array.Copy(BitConverter.GetBytes(length), 0, expectedBytes, startPosition, 4);
using (var memoryStream = new MemoryStream())
using (var stream = new BsonStreamAdapter(memoryStream))
{
stream.WriteBytes(bytes, 0, bytes.Length);
var position = stream.Position;
stream.BackpatchSize(startPosition);
memoryStream.ToArray().Should().Equal(expectedBytes);
stream.Position.Should().Be(position);
}
}
public void WriteBytes_should_optimize_count_of_one()
{
using (var baseStream = Substitute.For<Stream>())
using (var stream = new BsonStreamAdapter(baseStream))
{
var buffer = new byte[] { 1 };
stream.WriteBytes(buffer, 0, 1);
baseStream.Received(1).WriteByte(1);
}
}
public void WriteBytes_should_have_expected_effect(
int length,
int offset,
int count)
{
using (var memoryStream = new MemoryStream())
using (var stream = new BsonStreamAdapter(memoryStream))
{
var buffer = Enumerable.Range(0, length).Select(n => (byte)n).ToArray();
stream.WriteBytes(buffer, offset, count);
memoryStream.ToArray().Should().Equal(buffer.Skip(offset).Take(count));
}
}
public void WriteBytes_should_optimize_count_of_one()
{
var mockBaseStream = new Mock<Stream>();
using (var baseStream = mockBaseStream.Object)
using (var stream = new BsonStreamAdapter(baseStream))
{
var buffer = new byte[] { 1 };
stream.WriteBytes(buffer, 0, 1);
mockBaseStream.Verify(s => s.WriteByte(1), Times.Once);
}
}
