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Add basic tests for functionality using each update mechanism
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‎packages/react-reconciler/src/__tests__/ReactSuspenseWithNoopRenderer-test.internal.js

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@@ -1701,4 +1701,282 @@ describe('ReactSuspenseWithNoopRenderer', () => {
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expect(ReactNoop.getChildren()).toEqual([span('Loading A...')]);
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});
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describe('delays transitions when there a suspense config is supplied', () => {
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const SUSPENSE_CONFIG = {
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timeoutMs: 2000,
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};
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it('top level render', async () => {
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function App({page}) {
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return (
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<Suspense fallback={<Text text="Loading..." />}>
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<AsyncText text={page} ms={5000} />
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</Suspense>
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);
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}
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// Initial render.
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React.unstable_withSuspenseConfig(
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() => ReactNoop.render(<App page="A" />),
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SUSPENSE_CONFIG,
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);
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expect(Scheduler).toFlushAndYield(['Suspend! [A]', 'Loading...']);
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// Only a short time is needed to unsuspend the initial loading state.
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Scheduler.advanceTime(400);
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await advanceTimers(400);
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expect(ReactNoop.getChildren()).toEqual([span('Loading...')]);
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// Later we load the data.
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Scheduler.advanceTime(5000);
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await advanceTimers(5000);
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expect(Scheduler).toHaveYielded(['Promise resolved [A]']);
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expect(Scheduler).toFlushAndYield(['A']);
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expect(ReactNoop.getChildren()).toEqual([span('A')]);
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// Start transition.
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React.unstable_withSuspenseConfig(
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() => ReactNoop.render(<App page="B" />),
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SUSPENSE_CONFIG,
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);
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expect(Scheduler).toFlushAndYield(['Suspend! [B]', 'Loading...']);
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Scheduler.advanceTime(1000);
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await advanceTimers(1000);
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// Even after a second, we have still not yet flushed the loading state.
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expect(ReactNoop.getChildren()).toEqual([span('A')]);
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Scheduler.advanceTime(1100);
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await advanceTimers(1100);
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// After the timeout, we do show the loading state.
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expect(ReactNoop.getChildren()).toEqual([
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hiddenSpan('A'),
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span('Loading...'),
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]);
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// Later we load the data.
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Scheduler.advanceTime(3000);
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await advanceTimers(3000);
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expect(Scheduler).toHaveYielded(['Promise resolved [B]']);
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expect(Scheduler).toFlushAndYield(['B']);
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expect(ReactNoop.getChildren()).toEqual([span('B')]);
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});
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it('hooks', async () => {
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let transitionToPage;
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function App() {
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let [page, setPage] = React.useState('none');
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transitionToPage = setPage;
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if (page === 'none') {
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return null;
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}
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return (
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<Suspense fallback={<Text text="Loading..." />}>
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<AsyncText text={page} ms={5000} />
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</Suspense>
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);
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}
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ReactNoop.render(<App />);
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expect(Scheduler).toFlushAndYield([]);
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// Initial render.
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await ReactNoop.act(async () => {
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React.unstable_withSuspenseConfig(
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() => transitionToPage('A'),
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SUSPENSE_CONFIG,
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);
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expect(Scheduler).toFlushAndYield(['Suspend! [A]', 'Loading...']);
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// Only a short time is needed to unsuspend the initial loading state.
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Scheduler.advanceTime(400);
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await advanceTimers(400);
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expect(ReactNoop.getChildren()).toEqual([span('Loading...')]);
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});
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// Later we load the data.
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Scheduler.advanceTime(5000);
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await advanceTimers(5000);
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expect(Scheduler).toHaveYielded(['Promise resolved [A]']);
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expect(Scheduler).toFlushAndYield(['A']);
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expect(ReactNoop.getChildren()).toEqual([span('A')]);
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// Start transition.
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await ReactNoop.act(async () => {
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React.unstable_withSuspenseConfig(
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() => transitionToPage('B'),
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SUSPENSE_CONFIG,
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);
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expect(Scheduler).toFlushAndYield(['Suspend! [B]', 'Loading...']);
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Scheduler.advanceTime(1000);
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await advanceTimers(1000);
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// Even after a second, we have still not yet flushed the loading state.
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expect(ReactNoop.getChildren()).toEqual([span('A')]);
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Scheduler.advanceTime(1100);
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await advanceTimers(1100);
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// After the timeout, we do show the loading state.
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expect(ReactNoop.getChildren()).toEqual([
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hiddenSpan('A'),
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span('Loading...'),
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]);
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});
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// Later we load the data.
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Scheduler.advanceTime(3000);
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await advanceTimers(3000);
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expect(Scheduler).toHaveYielded(['Promise resolved [B]']);
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expect(Scheduler).toFlushAndYield(['B']);
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expect(ReactNoop.getChildren()).toEqual([span('B')]);
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});
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it('classes', async () => {
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let transitionToPage;
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class App extends React.Component {
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state = {page: 'none'};
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render() {
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transitionToPage = page => this.setState({page});
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let page = this.state.page;
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if (page === 'none') {
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return null;
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}
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return (
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<Suspense fallback={<Text text="Loading..." />}>
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<AsyncText text={page} ms={5000} />
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</Suspense>
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);
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}
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}
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ReactNoop.render(<App />);
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expect(Scheduler).toFlushAndYield([]);
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// Initial render.
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await ReactNoop.act(async () => {
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React.unstable_withSuspenseConfig(
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() => transitionToPage('A'),
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SUSPENSE_CONFIG,
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);
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expect(Scheduler).toFlushAndYield(['Suspend! [A]', 'Loading...']);
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// Only a short time is needed to unsuspend the initial loading state.
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Scheduler.advanceTime(400);
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await advanceTimers(400);
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expect(ReactNoop.getChildren()).toEqual([span('Loading...')]);
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});
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// Later we load the data.
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Scheduler.advanceTime(5000);
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await advanceTimers(5000);
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expect(Scheduler).toHaveYielded(['Promise resolved [A]']);
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expect(Scheduler).toFlushAndYield(['A']);
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expect(ReactNoop.getChildren()).toEqual([span('A')]);
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// Start transition.
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await ReactNoop.act(async () => {
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React.unstable_withSuspenseConfig(
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() => transitionToPage('B'),
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SUSPENSE_CONFIG,
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);
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expect(Scheduler).toFlushAndYield(['Suspend! [B]', 'Loading...']);
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Scheduler.advanceTime(1000);
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await advanceTimers(1000);
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// Even after a second, we have still not yet flushed the loading state.
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expect(ReactNoop.getChildren()).toEqual([span('A')]);
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Scheduler.advanceTime(1100);
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await advanceTimers(1100);
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// After the timeout, we do show the loading state.
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expect(ReactNoop.getChildren()).toEqual([
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hiddenSpan('A'),
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span('Loading...'),
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]);
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});
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// Later we load the data.
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Scheduler.advanceTime(3000);
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await advanceTimers(3000);
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expect(Scheduler).toHaveYielded(['Promise resolved [B]']);
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expect(Scheduler).toFlushAndYield(['B']);
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expect(ReactNoop.getChildren()).toEqual([span('B')]);
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});
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});
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it('disables suspense config when nothing is passed to withSuspenseConfig', async () => {
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function App({page}) {
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return (
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<Fragment>
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<Suspense fallback={<Text text="Loading..." />}>
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<AsyncText text={page} ms={2000} />
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</Suspense>
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</Fragment>
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);
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}
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// Initial render.
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ReactNoop.render(<App page="A" />);
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expect(Scheduler).toFlushAndYield(['Suspend! [A]', 'Loading...']);
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Scheduler.advanceTime(2000);
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await advanceTimers(2000);
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expect(Scheduler).toHaveYielded(['Promise resolved [A]']);
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expect(Scheduler).toFlushAndYield(['A']);
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expect(ReactNoop.getChildren()).toEqual([span('A')]);
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// Start transition.
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React.unstable_withSuspenseConfig(
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() => {
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// When we schedule an inner transition without a suspense config
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// so it should only suspend for a short time.
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React.unstable_withSuspenseConfig(() =>
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ReactNoop.render(<App page="B" />),
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);
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},
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{timeoutMs: 2000},
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);
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expect(Scheduler).toFlushAndYield(['Suspend! [B]', 'Loading...']);
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// Suspended
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expect(ReactNoop.getChildren()).toEqual([span('A')]);
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Scheduler.advanceTime(500);
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await advanceTimers(500);
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// Committed loading state.
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expect(ReactNoop.getChildren()).toEqual([
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hiddenSpan('A'),
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span('Loading...'),
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]);
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Scheduler.advanceTime(2000);
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await advanceTimers(2000);
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expect(Scheduler).toHaveYielded(['Promise resolved [B]']);
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expect(Scheduler).toFlushAndYield(['B']);
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expect(ReactNoop.getChildren()).toEqual([span('B')]);
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React.unstable_withSuspenseConfig(
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() => {
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// First we schedule an inner unrelated update.
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React.unstable_withSuspenseConfig(() =>
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ReactNoop.render(<App page="B" unrelated={true} />),
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);
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// Then we schedule another transition to a slow page,
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// but at this scope we should suspend for longer.
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Scheduler.unstable_next(() => ReactNoop.render(<App page="C" />));
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},
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{timeoutMs: 2000},
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);
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expect(Scheduler).toFlushAndYield([
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'Suspend! [C]',
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'Loading...',
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'Suspend! [C]',
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'Loading...',
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]);
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expect(ReactNoop.getChildren()).toEqual([span('B')]);
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Scheduler.advanceTime(1200);
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await advanceTimers(1200);
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// Even after a second, we have still not yet flushed the loading state.
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expect(ReactNoop.getChildren()).toEqual([span('B')]);
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Scheduler.advanceTime(1200);
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await advanceTimers(1200);
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// After the two second timeout we show the loading state.
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expect(ReactNoop.getChildren()).toEqual([
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hiddenSpan('B'),
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span('Loading...'),
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]);
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});
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});

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