svelte/test/runtime/samples/spread-element-class/_config.js

export default {
	html: `<div class='foo bar'>hello</div>`,
	test({ assert, component, target }) {
		component.blah = 'goodbye';
		assert.htmlEqual(target.innerHTML, `<div class='foo bar'>goodbye</div>`);
	}
};
Don't lose `class:` directive classes on an element with `{...spread}` attributes when updating (#3781) * include all class: directive updates on elements with spreads (#3421) * add test * update changelog 5 years ago			`export default {`
			html: `<div class='foo bar'>hello</div>`,
			`test({ assert, component, target }) {`
			`component.blah = 'goodbye';`
			assert.htmlEqual(target.innerHTML, `<div class='foo bar'>goodbye</div>`);
			`}`
			`};`