add(test): add test for get_valid_confg_file_path, use gtest #49

	name: UNIT_TEST
	on: [push]
	jobs:
	run-unit-test:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3

	- name: Run all unit tests.
	run: ./test/unit_test/run_unit_test.sh

	- uses: sarisia/actions-status-discord@v1
	if: always()
	with:
	webhook: ${{ secrets.DISCORD_WEBHOOK }}
	status: ${{ job.status }}

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