Validate files (boilerplate, tests and solution) in challenge.js

[unjust]

curriculum-parser/lib/challenge.js

Lines 74 to 80 in 8958634

	// TODO: Validate files (boilerplate, tests and solution)
	const files = flattenTree(await dirToTree(dir));
	return {
	slug,
	prefix,
	repo: opts?.repo,