Function createOne

packages/core/ui/styling/css-selector.spec.ts:34–39

(css: string, source = 'css-selectors.ts@test')

	}

	function createOne(css: string, source = 'css-selectors.ts@test'): RuleSet {
		const { rulesets } = create(css, source);
		expect(rulesets.length).toBe(1);

		return rulesets[0];
	}

	it('single selector', () => {
		const rule = createOne(`* { color: red; }`);