public async Task Int64TestAsync() { MemoryStream memStream = new MemoryStream(); BigEndianStream bigEndianStream = new BigEndianStream(memStream); var testByte1 = long.MaxValue; var testByte2 = long.MinValue; await bigEndianStream.WriteAsync(testByte1); await bigEndianStream.WriteAsync(testByte2); memStream.Seek(0, SeekOrigin.Begin); Assert.AreEqual(await bigEndianStream.ReadInt64Async(), testByte1); Assert.AreEqual(await bigEndianStream.ReadInt64Async(), testByte2); Assert.AreEqual(memStream.Position, memStream.Length); }