public void WriteLineReadOnlySpanChar_WritesToStream(int byteLength, string newLine) { // Arrange var stream = new TestMemoryStream(); var writer = new HttpResponseStreamWriter(stream, Encoding.UTF8); writer.NewLine = newLine; // Act using (writer) { var array = new string('a', byteLength).ToCharArray(); var span = new ReadOnlySpan <char>(array); writer.WriteLine(span); } // Assert Assert.Equal(byteLength + newLine.Length, stream.Length); }