Read.cs

        [TestCase(0, 0, "")]
        [TestCase(1, 1, "3")]
        [TestCase(2, 2, "3|4")]
        [TestCase(3, 3, "3|4|5")]
        [TestCase(4, 3, "3|4|5|0")]
        [TestCase(5, 3, "3|4|5|0|0")]
        public void Read_ToBuffer_ShouldBeAbleToReadBytes(int bufferSize, int expectedCount, string expectedArray)
        {
            var sut = new SpanBinaryReader(new byte[] { 1, 2, 3, 4, 5 }, 2);
            //                                                ^
            Span<byte> buffer = stackalloc byte[bufferSize];                      

            var count = sut.ReadTo(MemoryMarshal.CreateSpan(ref MemoryMarshal.GetReference(buffer), buffer.Length));
            var actualText = string.Join("|", buffer.ToArray());

            Assert.That(actualText, Is.EqualTo(expectedArray));
            Assert.That(count, Is.EqualTo(expectedCount));
        }