public void CapabilityInformation()
{
var stream = new TestStream();
using var device = new CyberCard(stream);
// survive without data
Assert.Null(device.GetDeviceCapacity());
Assert.Null(device.GetDeviceCapacityVA());
Assert.Null(device.GetDeviceVoltage());
Assert.Equal("P2\rP2\rP2\r", Encoding.ASCII.GetString(stream.ToWrittenArray())); // check we tried for each
// now we have data
stream.SetupRead(Encoding.ASCII.GetBytes("#0700,0400,120,057,063\r"));
Assert.Equal(400, device.GetDeviceCapacity());
Assert.Equal(700, device.GetDeviceCapacityVA());
Assert.Equal(120, device.GetDeviceVoltage());
Assert.Equal("P2\rP2\rP2\rP2\r", Encoding.ASCII.GetString(stream.ToWrittenArray())); // check we tried only once more
// subsequent read goes from cache
Assert.Equal(400, device.GetDeviceCapacity());
Assert.Equal(700, device.GetDeviceCapacityVA());
Assert.Equal(120, device.GetDeviceVoltage());
Assert.Equal("P2\rP2\rP2\rP2\r", Encoding.ASCII.GetString(stream.ToWrittenArray())); // no new reads
}