implement SPI library #51

# to view logs

	name: CI - Unit Tests

	on:
	push:
	branches:
	- main
	pull_request:
	branches:
	- main

	jobs:
	# run unit tests
	test:
	runs-on: ubuntu-latest

	steps:
	# checkout the repository
	- uses: actions/checkout@v4

	# enable caching of pip and platformio
	- uses: actions/cache@v4
	with:
	path: \|
	~/.cache/pip
	~/.platformio/.cache
	key: ${{ runner.os }}-pio

	# install GCC for platformio native platform
	# https://docs.platformio.org/en/latest/platforms/native.html#installation
	- name: Install GCC
	run: sudo apt-get install -y build-essential

	# install python
	- uses: actions/setup-python@v5
	with:
	python-version: '3.9'

	# install platformio
	- name: Install PlatformIO core
	run: pip install --upgrade platformio

	# create test/.pio/test/ folder
	- name: Create test/.pio/test folder
	run: mkdir -p test/.pio/test

	# run unit tests using 'test-native' environment
	- name: Run Unit Tests (native)
	run: pio test --project-dir ./test --environment native --junit-output-path 'test/.pio/test/native.xml'

	# upload test results
	- uses: test-summary/action@v2
	with:
	paths: "test/.pio/test/*.xml"
	show: "all"
	if: always()

Provide feedback