Add a missing tests check and update `CONTRIBUTING.md` #6

	name: Check for Tests in PR

	on:
	pull_request:
	types: [opened, synchronize, reopened]

	jobs:
	check-for-tests:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	with:
	fetch-depth: 0

	- name: Check for changes in test directory
	id: check-tests
	run: \|
	git status --porcelain > changed_files.txt
	if grep -qE "^[AM]\s+test/" changed_files.txt; then
	echo "Tests found in the PR"
	echo "tests_present=true" >> $GITHUB_OUTPUT
	else
	echo "No tests found in the PR"
	echo "tests_present=false" >> $GITHUB_OUTPUT
	fi

	- name: Comment on PR if tests are missing
	if: steps.check-tests.outputs.tests_present == 'false'
	uses: actions/[email protected]
	with:
	script: \|
	github.rest.issues.createComment({
	issue_number: context.issue.number,
	owner: context.repo.owner,
	repo: context.repo.repo,
	body: 'It appears that this PR does not include any tests. It is recommended to add tests, especially for critical changes, to ensure code quality and prevent regressions.'
	})

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