public void Test_MemoryBufferWriterOfT_AllocateAndGetMemoryAndSpan()
{
Memory <byte> memory = new byte[256];
var writer = new MemoryBufferWriter <byte>(memory);
Assert.AreEqual(writer.Capacity, 256);
Assert.AreEqual(writer.FreeCapacity, 256);
Assert.AreEqual(writer.WrittenCount, 0);
Assert.IsTrue(writer.WrittenMemory.IsEmpty);
Assert.IsTrue(writer.WrittenSpan.IsEmpty);
Span <byte> span = writer.GetSpan(43);
Assert.AreEqual(span.Length, memory.Length);
writer.Advance(43);
Assert.AreEqual(writer.Capacity, 256);
Assert.AreEqual(writer.FreeCapacity, 256 - 43);
Assert.AreEqual(writer.WrittenCount, 43);
Assert.AreEqual(writer.WrittenMemory.Length, 43);
Assert.AreEqual(writer.WrittenSpan.Length, 43);
Assert.AreEqual(memory.Length - 43, writer.GetSpan().Length);
Assert.AreEqual(memory.Length - 43, writer.GetMemory().Length);
Assert.AreEqual(memory.Length - 43, writer.GetSpan(22).Length);
Assert.AreEqual(memory.Length - 43, writer.GetMemory(22).Length);
Assert.ThrowsException <ArgumentOutOfRangeException>(() => writer.Advance(-1));
Assert.ThrowsException <ArgumentOutOfRangeException>(() => writer.GetMemory(-1));
Assert.ThrowsException <ArgumentException>(() => writer.GetSpan(1024));
Assert.ThrowsException <ArgumentException>(() => writer.GetMemory(1024));
Assert.ThrowsException <ArgumentException>(() => writer.Advance(1024));
}
public void Test_MemoryBufferWriterOfT_Clear()
{
Memory <byte> memory = new byte[256];
var writer = new MemoryBufferWriter <byte>(memory);
Span <byte> span = writer.GetSpan(4).Slice(0, 4);
byte[] data = { 1, 2, 3, 4 };
data.CopyTo(span);
writer.Advance(4);
Assert.AreEqual(writer.WrittenCount, 4);
Assert.IsTrue(span.SequenceEqual(data));
writer.Clear();
Assert.AreEqual(writer.WrittenCount, 0);
Assert.IsTrue(span.ToArray().All(b => b == 0));
}