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test(infinite-scroll): scroll threshold (#24902)

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This commit is contained in:
Sean Perkins
2022-03-09 10:31:10 -05:00
committed by GitHub
parent 11a5edfd9d
commit b193b83c7c
3 changed files with 55 additions and 17 deletions
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41
core/src/components/infinite-scroll/test/basic/e2e.ts
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@ -1,6 +1,23 @@
import { newE2EPage } from '@stencil/core/testing';
import type { E2EPage } from '@stencil/core/testing';
test('infinite-scroll: basic', async () => {
/**
* Scrolls an `ion-content` element to the bottom, triggering the `ionInfinite` event.
* Waits for the custom event to complete.
*/
async function scrollIonContentPage(page: E2EPage) {
const content = await page.find('ion-content');
await content.callMethod('scrollToBottom');
await page.waitForChanges();
const ev = await page.spyOnEvent('ionInfiniteComplete', 'document');
await ev.next();
}
describe('infinite-scroll: basic', () => {
it('should match existing visual screenshots', async () => {
const page = await newE2EPage({
url: '/src/components/infinite-scroll/test/basic?ionic:_testing=true'
});
@ -8,3 +25,25 @@ test('infinite-scroll: basic', async () => {
const compare = await page.compareScreenshot();
expect(compare).toMatchScreenshot();
});
describe('when enabled', () => {
it('should load more items when scrolled to the bottom', async () => {
const page = await newE2EPage({
url: '/src/components/infinite-scroll/test/basic?ionic:_testing=true'
});
const initialItems = await page.findAll('ion-item');
expect(initialItems.length).toBe(30);
await scrollIonContentPage(page);
const updatedItems = await page.findAll('ion-item');
expect(updatedItems.length).toBe(60);
});
});
});

13
core/src/components/infinite-scroll/test/basic/index.html
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@ -4,12 +4,14 @@
<head>
<meta charset="UTF-8">
<title>Infinite Scroll - Basic</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
<meta name="viewport"
content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
<link href="../../../../../css/ionic.bundle.css" rel="stylesheet">
<link href="../../../../../scripts/testing/styles.css" rel="stylesheet">
<script src="../../../../../scripts/testing/scripts.js"></script>
<script nomodule src="../../../../../dist/ionic/ionic.js"></script>
<script type="module" src="../../../../../dist/ionic/ionic.esm.js"></script></head>
<script type="module" src="../../../../../dist/ionic/ionic.esm.js"></script>
</head>
<body>
<ion-app>
@ -35,8 +37,6 @@
</ion-infinite-scroll>
</ion-content>
</ion-app>
<script>
@ -48,12 +48,11 @@
}
infiniteScroll.addEventListener('ionInfinite', async function () {
console.log('Loading data...');
await wait(500);
infiniteScroll.complete();
appendItems();
console.log('Done');
// Custom event consumed in the e2e tests
document.dispatchEvent(new CustomEvent('ionInfiniteComplete'));
});
function appendItems() {