svelte/test/runtime/samples/await-then-catch-static/_config.js

let fulfil;

let promise = new Promise(f => {
	fulfil = f;
});

export default {
	props: {
		promise
	},

	html: `
		<p>loading...</p>
	`,

	test({ assert, component, target }) {
		fulfil(42);

		return promise
			.then(() => {
				assert.htmlEqual(target.innerHTML, `
					<p>loaded</p>
				`);

				promise = new Promise((f, _) => {
					fulfil = f;
				});

				component.promise = promise;

				assert.htmlEqual(target.innerHTML, `
					<p>loading...</p>
				`);

				fulfil(43);

				return promise.then(() => {});
			})
			.then(() => {
				assert.htmlEqual(target.innerHTML, `
					<p>loaded</p>
				`);
			});
	}
};