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The following CTest tests cover some TNC functionality and the interface to codec2:

Name: audio_buffer Tests the thread safety of the audio buffer routines.
Name: resampler Tests FreeDATA audio resampling from 48KHz to 8KHz.
Name: tnc_state_machine Tests TNC transitions between states. This needs to be expanded.
Name: tnc_irs_iss Tests TNC modem queue interaction. This needs to be expanded.
Name: helper_routines Tests various helper routines.
Name: py_highsnr_stdio_P_P_multi Tests a high signal-to-noise ratio (good quality) audio path using multiple codecs. (Pure python.)
Name: py_highsnr_stdio_P_P_datacx Tests a high signal-to-noise ratio audio path using multiple individual codecs.
Name: py_highsnr_stdio_P_C_datacx Tests a high signal-to-noise ratio audio path using multiple individual codecs.
Name: py_highsnr_stdio_C_P_datacx Tests a high signal-to-noise ratio audio path using multiple individual codecs.
Name: highsnr_stdio_P_C_single Tests compatibility with FreeDATA's transmit and freedv's raw data receive.
Name: highsnr_stdio_C_P_single Tests compatibility with freedv's raw data transmit and FreeDATA's receive.
Name: highsnr_stdio_P_P_single Tests a high signal-to-noise ratio audio path using multiple codecs. (Requires POSIX system.)
Name: highsnr_stdio_P_P_multi Tests a high signal-to-noise ratio audio path using multiple codecs. (Requires POSIX system.)

The following tests can not currently be run with GitHub's pipeline as they require the ALSA dummy device kernel module to be installed. They also do not perform reliably. These tests are slowly being replaced with equivalent pipeline-compatible tests.

Name: highsnr_virtual1_P_P_single_alsa Tests a high signal-to-noise ratio audio path using a single codec directly over an ALSA dummy device.
Name: highsnr_virtual2_P_P_single Tests a high signal-to-noise ratio audio path using a single codec over an ALSA dummy device. Not functional due to an incompatibility between the two scripts in the way they determine audio devices.
Name: highsnr_virtual3_P_P_multi Tests a high signal-to-noise ratio audio path using multiple codecs over an ALSA dummy device.
Name: highsnr_virtual4_P_P_single_callback Not functional due to an incompatibility between the two scripts in the way they determine audio devices.
Name: highsnr_virtual4_P_P_single_callback_outside Not functional due to an incompatibility between the two scripts in the way they determine audio devices.
Name: highsnr_virtual5_P_P_multi_callback
Name: highsnr_virtual5_P_P_multi_callback_outside

Instructions

Install:

cd FreeDATA
mkdir build
cd build
cmake -DCODEC2_BUILD_DIR=$HOME/codec2/build_linux ..

List available tests:

ctest -N
Test project /home/david/FreeDATA/build
Test #1: 000_audio_tests
Test #2: 001_highsnr_stdio_audio

Total Tests: 2

Run tests:

ctest --output-on-failure

or, to include only GitHub-compatible tests:

GITHUB_RUN_ID=0 ctest --output-on-failure

Run tests verbosely:
```
ctest -V
```

001_HIGHSNR_STDIO_AUDIO TEST SUITE

Install

sudo apt update
sudo apt upgrade
sudo apt install git cmake build-essential python3-pip portaudio19-dev python3-pyaudio
pip3 install crcengine
pip3 install threading

Install codec2, and set up the libcodec2.so shared library path, for example
```
export LD_LIBRARY_PATH=${HOME}/codec2/build_linux/src
```

STDIO tests

Pipes are used to move audio samples from the Tx to Rx:

python3 util_tx.py --mode datac1 --delay 500 --frames 2 --bursts 1 | python3 util_rx.py --mode datac1 --frames 2 --bursts 1

Moderate signal-to-noise ratio (SNR)

Tests need to be written that test a low SNR data path so that the TNC performance when packets are lost can be evaluated.

AUDIO test via virtual audio devices

Important:

The virtual audio devices are great for testing, but they are also a little tricky to handle. So there's a high chance, the tests will fail, if you are running them via virtual audio devices. You should run the tests several times, while keeping this in mind. Most time the ctest is working even if it is failing.

Create virtual audio devices. Note: This command needs to be run again after every reboot
```
sudo modprobe snd-aloop index=1,2 enable=1,1 pcm_substreams=1,1 id=CHAT1,CHAT2
```

Check if devices have been created

 aplay -l

 Karte 0: Intel [HDA Intel], Gerät 0: Generic Analog [Generic Analog]
   Sub-Geräte: 1/1
   Sub-Gerät #0: subdevice #0
 Karte 1: CHAT1 [Loopback], Gerät 0: Loopback PCM [Loopback PCM]
   Sub-Geräte: 1/1
   Sub-Gerät #0: subdevice #0
 Karte 1: CHAT1 [Loopback], Gerät 1: Loopback PCM [Loopback PCM]
   Sub-Geräte: 1/1
   Sub-Gerät #0: subdevice #0
 Karte 2: CHAT2 [Loopback], Gerät 0: Loopback PCM [Loopback PCM]
   Sub-Geräte: 1/1
   Sub-Gerät #0: subdevice #0
 Karte 2: CHAT2 [Loopback], Gerät 1: Loopback PCM [Loopback PCM]
   Sub-Geräte: 1/1
   Sub-Gerät #0: subdevice #0

Determine the audio device number you would like to use:

python3 util_rx.py --list
<snip>
audiodev:  0 HDA Intel PCH: ALC269VC Analog (hw:0,0)
audiodev:  1 HDA Intel PCH: HDMI 0 (hw:0,3)
audiodev:  2 HDA Intel PCH: HDMI 1 (hw:0,7)
audiodev:  3 HDA Intel PCH: HDMI 2 (hw:0,8)
audiodev:  4 Loopback: PCM (hw:1,0)
audiodev:  5 Loopback: PCM (hw:1,1)
audiodev:  6 Loopback: PCM (hw:2,0)
audiodev:  7 Loopback: PCM (hw:2,1)

In this case we choose audiodev 4 for the RX and 5 for the Tx.

Start the Rx first, then Tx in separate consoles:

python3 util_rx.py --mode datac0 --frames 2 --bursts 1 --audiodev 4 --debug
python3 util_tx.py --mode datac0 --frames 2 --bursts 1 --audiodev 5

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