Better unit tests

[tresf]

A placeholder to port over some of @vogt31337's unit tests from the 2.8.1-experimental branch.

 public void testSerialPortListing() {
 String[] out = SerialPortList.getPortNames();
 System.out.println(Arrays.toString(out));

 // if we reached this point, loading the dynamic lib worked.
 assertTrue(true);
 }

 private String findASerialPort() {
 String[] out = SerialPortList.getPortNames();

 if (out.length > 0) {
 return out[0];
 } else {
 return null;
 }
 }

 public void testSerialPortRead() {
 String port = findASerialPort(); // could also be "COM1" under windows, or /dev/ttyS0 under linux

 if (port != null) {
 SerialPort serialPort = new SerialPort(port);
 try {
 serialPort.openPort();//Open serial port
 serialPort.setParams(9600, 8, 1, 0);//Set params.
 byte[] buffer = serialPort.readBytes(10);//Read 10 bytes from serial port
 serialPort.closePort();//Close serial port
 } catch (SerialPortException ex) {
 System.out.println(ex);
 }
 } else {
 Assert.fail("No comport found. Maybe running on a laptop? Or cables aren't attached?");
 }
 assertTrue(true);

 }

 private String findASerialPort() {
 String[] out = SerialPortList.getPortNames();

 if (out.length > 0) {
 return out[0];
 } else {
 return null;
 }
 }

 public void testSerialPortWrite() {
 String port = findASerialPort(); // could also be "COM1" under windows, or /dev/ttyS0 under linux

 if (port != null) {
 SerialPort serialPort = new SerialPort(port);
 try {
 serialPort.openPort();//Open serial port
 serialPort.setParams(SerialPort.BAUDRATE_9600,
 SerialPort.DATABITS_8,
 SerialPort.STOPBITS_1,
 SerialPort.PARITY_NONE);//Set params. Also you can set params by this string: serialPort.setParams(9600, 8, 1, 0);
 serialPort.writeBytes("This is a test string".getBytes());//Write data to port
 serialPort.closePort();//Close serial port
 } catch (SerialPortException ex) {
 System.out.println(ex);
 }
 } else {
 Assert.fail("No comport found. Maybe running on a laptop? Or cables aren't attached?");
 }
 assertTrue(true);
 }

[bmarwell]

To get a stable unit test, we might want to create a virtual serial port using a @Before directive.

The setup might differ a little per Operating System. Another good option would be to use a junit @Rule. For Linux, this woulduse socat, other methods for other OSes.

[tresf]

The setup might differ a little per Operating System.

I vote we skip virtual com ports for Windows. They generally require signed drivers and get into a bit of a mess. If a CI service such as AppVeyor has support for them, this would allow us to do CI testing, but local testing on a PC would still need to make some assumptions.

[bmarwell]

The setup might differ a little per Operating System.

I vote we skip virtual com ports for Windows. They generally require signed drivers and get into a bit of a mess. If a CI service such as AppVeyor has support for them, this would allow us to do CI testing, but local testing on a PC would still need to make some assumptions.

That's okay for me! :)
I will start with linux for now.

[tresf]

Partially implemented via #47, #151.

#151 was particularly interesting to figure out, mostly due to some test running against old binaries. This should all be sorted now.