[CI] Add basic unit testing

.github/workflows/unit-test.yml

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+name: "Unit test"
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+  workflow_dispatch:
+
+jobs:
+  unit-test:
+    name: Build and run unit test
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    - name: Install libboost
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y libboost-all-dev
+
+    - name: Run unit test
+      run: |
+        cd extras/test/unit
+        ./test.sh

extras/test/unit/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.13)
+
+project(radiolib-unittest)
+
+# add RadioLib sources
+add_subdirectory("${CMAKE_CURRENT_SOURCE_DIR}/../../../../RadioLib" "${CMAKE_CURRENT_BINARY_DIR}/RadioLib")
+
+# add test sources
+file(GLOB_RECURSE TEST_SOURCES
+  "tests/main.cpp"
+  "tests/TestModule.cpp"
+)
+
+# create the executable
+add_executable(${PROJECT_NAME} ${TEST_SOURCES})
+
+# include directories
+target_include_directories(${PROJECT_NAME} PUBLIC include)
+
+# link RadioLib
+target_link_libraries(${PROJECT_NAME} RadioLib fmt)
+
+# set target properties and options
+set_property(TARGET ${PROJECT_NAME} PROPERTY CXX_STANDARD 20)
+target_compile_options(${PROJECT_NAME} PRIVATE -Wall -Wextra)
+
+# set RadioLib debug
+#target_compile_definitions(RadioLib PUBLIC RADIOLIB_DEBUG_BASIC RADIOLIB_DEBUG_SPI)
+#target_compile_definitions(RadioLib PUBLIC RADIOLIB_DEBUG_PORT=stdout)

extras/test/unit/include/HardwareEmulation.hpp

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+#ifndef HARDWARE_EMULATION_HPP
+#define HARDWARE_EMULATION_HPP
+
+#include <stdint.h>
+
+// value that is returned by the emualted radio class when performing SPI transfer to it
+#define EMULATED_RADIO_SPI_RETURN (0xFF)
+
+// pin indexes
+#define EMULATED_RADIO_NSS_PIN    (1)
+#define EMULATED_RADIO_IRQ_PIN    (2)
+#define EMULATED_RADIO_RST_PIN    (3)
+#define EMULATED_RADIO_GPIO_PIN   (4)
+
+enum PinFunction_t {
+  PIN_UNASSIGNED = 0,
+  PIN_CS,
+  PIN_IRQ,
+  PIN_RST,
+  PIN_GPIO,
+};
+
+// structure for emulating GPIO pins
+struct EmulatedPin_t {
+  uint32_t mode;
+  uint32_t value;
+  bool event;
+  PinFunction_t func; 
+};
+
+// structure for emulating SPI registers
+struct EmulatedRegister_t {
+  uint8_t value;
+  uint8_t readOnlyBitFlags;
+  bool bufferAccess;
+};
+
+// base class for emulated radio modules (SX126x etc.)
+class EmulatedRadio {
+  public:
+    void connect(EmulatedPin_t* csPin, EmulatedPin_t* irqPin, EmulatedPin_t* rstPin, EmulatedPin_t* gpioPin) {
+      this->cs = csPin;
+      this->cs->func = PIN_CS;
+      this->irq = irqPin;
+      this->irq->func = PIN_IRQ;
+      this->rst = rstPin;
+      this->rst->func = PIN_RST;
+      this->gpio = gpioPin;
+      this->gpio->func = PIN_GPIO;
+    }
+
+    virtual uint8_t HandleSPI(uint8_t b) {
+      (void)b;
+      // handle the SPI input and generate output here
+      return(EMULATED_RADIO_SPI_RETURN);
+    }
+
+    virtual void HandleGPIO() {
+      // handle discrete GPIO signals here (e.g. reset state machine on NSS falling edge)
+    }
+  
+  protected:
+    // pointers to emulated GPIO pins
+    // this is done via pointers so that the same GPIO entity is shared, like with a real hardware
+    EmulatedPin_t* cs;
+    EmulatedPin_t* irq;
+    EmulatedPin_t* rst;
+    EmulatedPin_t* gpio;
+};
+
+#endif

extras/test/unit/include/TestHal.hpp

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+#ifndef TEST_HAL_HPP
+#define TEST_HAL_HPP
+
+#include <chrono>
+#include <thread>
+#include <fmt/format.h>
+
+#include <RadioLib.h>
+
+#include <boost/log/trivial.hpp>
+#include <boost/format.hpp>
+
+#if defined(TEST_HAL_LOG)
+#define HAL_LOG(...) BOOST_TEST_MESSAGE(__VA_ARGS__)
+#else
+#define HAL_LOG(...) {}
+#endif
+
+#include "HardwareEmulation.hpp"
+
+#define TEST_HAL_INPUT          (0)
+#define TEST_HAL_OUTPUT         (1)
+#define TEST_HAL_LOW            (0)
+#define TEST_HAL_HIGH           (1)
+#define TEST_HAL_RISING         (0)
+#define TEST_HAL_FALLING        (1)
+
+// number of emulated GPIO pins
+#define TEST_HAL_NUM_GPIO_PINS  (32)
+
+#define TEST_HAL_SPI_LOG_LENGTH (512)
+
+class TestHal : public RadioLibHal {
+  public:
+    TestHal() : RadioLibHal(TEST_HAL_INPUT, TEST_HAL_OUTPUT, TEST_HAL_LOW, TEST_HAL_HIGH, TEST_HAL_RISING, TEST_HAL_FALLING) { }
+
+    void init() override {
+      HAL_LOG("TestHal::init()");
+
+      // save program start timestamp
+      start = std::chrono::high_resolution_clock::now();
+
+      // init emulated GPIO
+      for(int i = 0; i < TEST_HAL_NUM_GPIO_PINS; i++) {
+        this->gpio[i].mode = 0;
+        this->gpio[i].value = 0;
+        this->gpio[i].event = false;
+        this->gpio[i].func = PIN_UNASSIGNED;
+      }
+    }
+
+    void term() override {
+      HAL_LOG("TestHal::term()");
+    }
+
+    void pinMode(uint32_t pin, uint32_t mode) override {
+      HAL_LOG("TestHal::pinMode(pin=" << pin << ", mode=" << mode << " [" << ((mode == TEST_HAL_INPUT) ? "INPUT" : "OUTPUT") << "])");
+      
+      // check the range
+      BOOST_ASSERT_MSG(pin < TEST_HAL_NUM_GPIO_PINS, "Pin number out of range");
+
+      // check known modes
+      BOOST_ASSERT_MSG(((mode == TEST_HAL_INPUT) || (mode == TEST_HAL_OUTPUT)), "Invalid pin mode");
+
+      // set mode
+      this->gpio[pin].mode = mode;
+    }
+
+    void digitalWrite(uint32_t pin, uint32_t value) override {
+      HAL_LOG("TestHal::digitalWrite(pin=" << pin << ", value=" << value << " [" << ((value == TEST_HAL_LOW) ? "LOW" : "HIGH") << "])");
+
+      // check the range
+      BOOST_ASSERT_MSG(pin < TEST_HAL_NUM_GPIO_PINS, "Pin number out of range");
+
+      // check it is output
+      BOOST_ASSERT_MSG(this->gpio[pin].mode == TEST_HAL_OUTPUT, "GPIO is not output!");
+
+      // check known values
+      BOOST_ASSERT_MSG(((value == TEST_HAL_LOW) || (value == TEST_HAL_HIGH)), "Invalid output value");
+
+      // set value
+      this->gpio[pin].value = value;
+      this->gpio[pin].event = true;
+      if(radio) {
+        this->radio->HandleGPIO();
+      }
+      this->gpio[pin].event = false;
+    }
+
+    uint32_t digitalRead(uint32_t pin) override {
+      HAL_LOG("TestHal::digitalRead(pin=" << pin << ")");
+
+      // check the range
+      BOOST_ASSERT_MSG(pin < TEST_HAL_NUM_GPIO_PINS, "Pin number out of range");
+
+      // check it is input
+      BOOST_ASSERT_MSG(this->gpio[pin].mode == TEST_HAL_INPUT, "GPIO is not input");
+
+      // read the value
+      uint32_t value = this->gpio[pin].value;
+      HAL_LOG("TestHal::digitalRead(pin=" << pin << ")=" << value << " [" << ((value == TEST_HAL_LOW) ? "LOW" : "HIGH") << "]");
+      return(value);
+    }
+
+    void attachInterrupt(uint32_t interruptNum, void (*interruptCb)(void), uint32_t mode) override {
+      HAL_LOG("TestHal::attachInterrupt(interruptNum=" << interruptNum << ", interruptCb=" << interruptCb << ", mode=" << mode << ")");
+    }
+
+    void detachInterrupt(uint32_t interruptNum) override {
+      HAL_LOG("TestHal::detachInterrupt(interruptNum=" << interruptNum << ")");
+    }
+
+    void delay(unsigned long ms) override {
+      HAL_LOG("TestHal::delay(ms=" << ms << ")");
+      const auto start = std::chrono::high_resolution_clock::now();
+
+      // sleep_for is sufficient for ms-precision sleep
+      std::this_thread::sleep_for(std::chrono::duration<unsigned long, std::milli>(ms));
+
+      // measure and print
+      const auto end = std::chrono::high_resolution_clock::now();
+      const std::chrono::duration<double, std::milli> elapsed = end - start;
+      HAL_LOG("TestHal::delay(ms=" << ms << ")=" << elapsed.count() << "ms");
+    }
+
+    void delayMicroseconds(unsigned long us) override {
+      HAL_LOG("TestHal::delayMicroseconds(us=" << us << ")");
+      const auto start = std::chrono::high_resolution_clock::now();
+
+      // busy wait is needed for microseconds precision
+      const auto len = std::chrono::microseconds(us);
+      while(std::chrono::high_resolution_clock::now() - start < len);
+
+      // measure and print
+      const auto end = std::chrono::high_resolution_clock::now();
+      const std::chrono::duration<double, std::micro> elapsed = end - start;
+      HAL_LOG("TestHal::delayMicroseconds(us=" << us << ")=" << elapsed.count() << "us");
+    }
+
+    void yield() override {
+      HAL_LOG("TestHal::yield()");
+    }
+
+    unsigned long millis() override {
+      HAL_LOG("TestHal::millis()");
+      std::chrono::time_point now = std::chrono::high_resolution_clock::now();
+      auto res = std::chrono::duration_cast<std::chrono::milliseconds>(now - this->start);
+      HAL_LOG("TestHal::millis()=" << res.count());
+      return(res.count());
+    }
+
+    unsigned long micros() override {
+      HAL_LOG("TestHal::micros()");
+      std::chrono::time_point now = std::chrono::high_resolution_clock::now();
+      auto res = std::chrono::duration_cast<std::chrono::microseconds>(now - this->start);
+      HAL_LOG("TestHal::micros()=" << res.count());
+      return(res.count());
+    }
+
+    long pulseIn(uint32_t pin, uint32_t state, unsigned long timeout) override {
+      HAL_LOG("TestHal::pulseIn(pin=" << pin << ", state=" << state << ", timeout=" << timeout << ")");
+      return(0);
+    }
+
+    void spiBegin() {
+      HAL_LOG("TestHal::spiBegin()");
+    }
+
+    void spiBeginTransaction() {
+      HAL_LOG("TestHal::spiBeginTransaction()");
+
+      // wipe history log
+      memset(this->spiLog, 0x00, TEST_HAL_SPI_LOG_LENGTH);
+      this->spiLogPtr = this->spiLog;
+    }
+
+    void spiTransfer(uint8_t* out, size_t len, uint8_t* in) {
+      HAL_LOG("TestHal::spiTransfer(len=" << len << ")");
+      
+      for(size_t i = 0; i < len; i++) {
+        // append to log
+        (*this->spiLogPtr++) = out[i];
+
+        // process the SPI byte
+        in[i] = this->radio->HandleSPI(out[i]);
+
+        // outpu debug
+        HAL_LOG(fmt::format("out={:#02x}, in={:#02x}", out[i], in[i]));
+      }
+    }
+
+    void spiEndTransaction() {
+      HAL_LOG("TestHal::spiEndTransaction()");
+    }
+
+    void spiEnd() {
+      HAL_LOG("TestHal::spiEnd()");
+    }
+
+    void tone(uint32_t pin, unsigned int frequency, unsigned long duration = 0) {
+      HAL_LOG("TestHal::tone(pin=" << pin << ", frequency=" << frequency << ", duration=" << duration << ")");
+    }
+
+    void noTone(uint32_t pin) {
+      HAL_LOG("TestHal::noTone(pin=" << pin << ")");
+    }
+
+    // method to compare buffer to the internal SPI log, for verifying SPI transactions
+    int spiLogMemcmp(const void* in, size_t n) {
+      return(memcmp(this->spiLog, in, n));
+    }
+
+    // method that "connects" the emualted radio hardware to this HAL
+    void connectRadio(EmulatedRadio* r) {
+      this->radio = r;
+      this->radio->connect(&this->gpio[EMULATED_RADIO_NSS_PIN],
+                           &this->gpio[EMULATED_RADIO_IRQ_PIN],
+                           &this->gpio[EMULATED_RADIO_RST_PIN],
+                           &this->gpio[EMULATED_RADIO_GPIO_PIN]);
+    }
+
+  private:
+    // array of emulated GPIO pins
+    EmulatedPin_t gpio[TEST_HAL_NUM_GPIO_PINS];
+
+    // start time point
+    std::chrono::time_point<std::chrono::high_resolution_clock> start;
+
+    // emulated radio hardware
+    EmulatedRadio* radio;
+
+    // SPI history log
+    uint8_t spiLog[TEST_HAL_SPI_LOG_LENGTH];
+    uint8_t* spiLogPtr;
+};
+
+#endif

extras/test/unit/test.sh

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+#!/bin/bash
+
+set -e
+
+# build the test binary
+mkdir -p build
+cd build
+cmake -G "CodeBlocks - Unix Makefiles" ..
+make -j4
+
+# run it
+cd ..
+./build/radiolib-unittest --log_level=message

extras/test/unit/tests/TestModule.cpp

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+// boost test header
+#include <boost/test/unit_test.hpp>
+
+// mock HAL
+#include "TestHal.hpp"
+
+// testing fixture
+struct ModuleFixture {
+  TestHal* hal = nullptr;
+  Module* mod = nullptr;
+  EmulatedRadio* radioHardware = nullptr;
+
+  ModuleFixture()  { 
+    BOOST_TEST_MESSAGE("--- Module fixture setup ---"); 
+    hal = new TestHal();
+    radioHardware = new EmulatedRadio();
+    hal->connectRadio(radioHardware);
+
+    mod = new Module(hal, EMULATED_RADIO_NSS_PIN, EMULATED_RADIO_IRQ_PIN, EMULATED_RADIO_RST_PIN, EMULATED_RADIO_GPIO_PIN);
+    mod->init();
+  }
+
+  ~ModuleFixture() { 
+    BOOST_TEST_MESSAGE("--- Module fixture teardown ---");
+    mod->term();
+    delete[] mod;
+    delete[] hal;
+  }
+};
+
+BOOST_FIXTURE_TEST_SUITE(suite_Module, ModuleFixture)
+
+  BOOST_FIXTURE_TEST_CASE(Module_SPIgetRegValue_reg, ModuleFixture)
+  {
+    BOOST_TEST_MESSAGE("--- Test Module::SPIgetRegValue register access ---");
+    int16_t ret;
+
+    // basic register read with default config
+    const uint8_t address = 0x12;
+    const uint8_t spiTxn[] = { address, 0x00 };
+    ret = mod->SPIgetRegValue(address);
+
+    // check return code, value and history log
+    BOOST_TEST(ret >= RADIOLIB_ERR_NONE);
+    BOOST_TEST(ret == EMULATED_RADIO_SPI_RETURN);
+    BOOST_TEST(hal->spiLogMemcmp(spiTxn, sizeof(spiTxn)) == 0);
+
+    // register read masking test
+    const uint8_t msb = 5;
+    const uint8_t lsb = 1;
+    ret = mod->SPIgetRegValue(address, msb, lsb);
+    BOOST_TEST(ret == 0x3E);
+
+    // invalid mask tests (swapped MSB and LSB, out of range bit masks)
+    ret = mod->SPIgetRegValue(address, lsb, msb);
+    BOOST_TEST(ret == RADIOLIB_ERR_INVALID_BIT_RANGE);
+    ret = mod->SPIgetRegValue(address, 10, lsb);
+    BOOST_TEST(ret == RADIOLIB_ERR_INVALID_BIT_RANGE);
+    ret = mod->SPIgetRegValue(address, msb, 10);
+    BOOST_TEST(ret == RADIOLIB_ERR_INVALID_BIT_RANGE);
+  }
+
+  BOOST_FIXTURE_TEST_CASE(Module_SPIgetRegValue_stream, ModuleFixture)
+  {
+    BOOST_TEST_MESSAGE("--- Test Module::SPIgetRegValue stream access ---");
+    int16_t ret;
+
+    // change settings to stream type
+    mod->spiConfig.widths[RADIOLIB_MODULE_SPI_WIDTH_ADDR] = Module::BITS_16;
+    mod->spiConfig.widths[RADIOLIB_MODULE_SPI_WIDTH_CMD] = Module::BITS_8;
+    mod->spiConfig.statusPos = 1;
+    mod->spiConfig.cmds[RADIOLIB_MODULE_SPI_COMMAND_READ] = RADIOLIB_SX126X_CMD_READ_REGISTER;
+    mod->spiConfig.cmds[RADIOLIB_MODULE_SPI_COMMAND_WRITE] = RADIOLIB_SX126X_CMD_WRITE_REGISTER;
+    mod->spiConfig.cmds[RADIOLIB_MODULE_SPI_COMMAND_NOP] = RADIOLIB_SX126X_CMD_NOP;
+    mod->spiConfig.cmds[RADIOLIB_MODULE_SPI_COMMAND_STATUS] = RADIOLIB_SX126X_CMD_GET_STATUS;
+    mod->spiConfig.stream = true;
+
+    // basic register read
+    const uint8_t address = 0x12;
+    const uint8_t spiTxn[] = { RADIOLIB_SX126X_CMD_READ_REGISTER, 0x00, address, 0x00, 0x00 };
+    ret = mod->SPIgetRegValue(address);
+
+    // check return code, value and history log
+    BOOST_TEST(ret >= RADIOLIB_ERR_NONE);
+    BOOST_TEST(ret == EMULATED_RADIO_SPI_RETURN);
+    BOOST_TEST(hal->spiLogMemcmp(spiTxn, sizeof(spiTxn)) == 0);
+
+    // register read masking test
+    const uint8_t msb = 5;
+    const uint8_t lsb = 1;
+    ret = mod->SPIgetRegValue(address, msb, lsb);
+    BOOST_TEST(ret == 0x3E);
+
+    // invalid mask tests (swapped MSB and LSB, out of range bit masks)
+    ret = mod->SPIgetRegValue(address, lsb, msb);
+    BOOST_TEST(ret == RADIOLIB_ERR_INVALID_BIT_RANGE);
+    ret = mod->SPIgetRegValue(address, 10, lsb);
+    BOOST_TEST(ret == RADIOLIB_ERR_INVALID_BIT_RANGE);
+    ret = mod->SPIgetRegValue(address, msb, 10);
+    BOOST_TEST(ret == RADIOLIB_ERR_INVALID_BIT_RANGE);
+  }
+
+BOOST_AUTO_TEST_SUITE_END()

extras/test/unit/tests/main.cpp

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+#define BOOST_TEST_MODULE "RadioLib Unit test"
+#include <boost/test/included/unit_test.hpp>
+
+// intentionally left blank, boost.test creates its own entrypoint
+