chore: add label test

[productdevbook]

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[github-actions]

Coverage Summary

Status	Category	Percentage	Covered / Total
🔵	Lines	71.92%	246 / 342
🔵	Statements	71.92%	246 / 342
🔵	Functions	60%	9 / 15
🔵	Branches	75%	18 / 24

File Coverage

File	Stmts	% Branch	% Funcs	% Lines	Uncovered Lines
packages/components/label/src/label.ts	89.58%	100%	75%	89.58%	30-34
packages/core/primitive/dist/index.mjs	100%	100%	100%	100%
packages/core/primitive/dist/primitive.mjs	100%	66.66%	100%	100%
packages/core/primitive/src/index.ts	100%	100%	100%	100%
packages/core/primitive/src/primitive.ts	100%	62.5%	100%	100%
packages/core/provide/src/createProvide.ts	33.57%	75%	33.33%	33.57%	23-30, 51-107, 109-134
packages/core/provide/src/index.ts	100%	100%	0%	100%