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scrollToHash.test.mjs
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scrollToHash.test.mjs
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// @ts-check
import puppeteer from "puppeteer";
import { assertThrows } from "std/testing/asserts.ts";
import serveProjectFiles from "./test/serveProjectFiles.mjs";
import testPuppeteerPage from "./test/testPuppeteerPage.mjs";
import scrollToHash from "./scrollToHash.mjs";
Deno.test("`scrollToHash` with argument 1 `hash` not a string.", () => {
assertThrows(
() => {
scrollToHash(
// @ts-expect-error Testing invalid.
true,
);
},
TypeError,
"Argument 1 `hash` must be a string.",
);
});
Deno.test("`scrollToHash` with target existing.", async () => {
const abortController = new AbortController();
const projectFileServer = await serveProjectFiles(abortController.signal);
try {
const projectFilesOriginUrl = new URL(
`http://localhost:${projectFileServer.port}`,
);
const browser = await puppeteer.launch();
try {
await testPuppeteerPage(browser, projectFilesOriginUrl, async (page) => {
await page.setContent(/* HTML */ `<!DOCTYPE html>
<html>
<head>
<style>
body {
margin: 0;
}
#padding {
padding: 200vh 200vw;
}
#target {
width: 1px;
height: 1px;
}
</style>
</head>
<body>
<div id="padding">
<div id="target"></div>
</div>
</body>
</html>`);
await page.evaluate(async (projectFileServerPort) => {
const [{ default: Defer }, { default: scrollToHash }] = await Promise
.all([
/** @type {Promise<import("./test/Defer.mjs")>} */ (
import(
`http://localhost:${projectFileServerPort}/test/Defer.mjs`
)
),
/** @type {Promise<import("./scrollToHash.mjs")>} */ (
import(
`http://localhost:${projectFileServerPort}/scrollToHash.mjs`
)
),
]);
const targetElement = /** @type {HTMLDivElement} */ (
document.getElementById("target")
);
const {
promise: targetInView,
resolve: targetInViewResolve,
reject: targetInViewReject,
} = new Defer();
const targetInViewTimeout = setTimeout(() => {
targetInViewReject(
new Error("Target element wasn’t within the viewport in time."),
);
}, 4000);
const intersectionObserver = new IntersectionObserver(
(entries) => {
for (const { isIntersecting } of entries) {
if (isIntersecting) {
clearTimeout(targetInViewTimeout);
targetInViewResolve();
}
}
},
{ threshold: 1 },
);
intersectionObserver.observe(targetElement);
scrollToHash("#target");
await targetInView;
intersectionObserver.unobserve(targetElement);
scrollToHash();
const scrollingElement = /** @type {Element} */ (
document.scrollingElement
);
if (scrollingElement.scrollLeft !== 0) {
throw new Error("Page scroll should be at the start horizontally.");
}
if (scrollingElement.scrollTop !== 0) {
throw new Error("Page scroll should be at the start vertically.");
}
}, projectFileServer.port);
});
} finally {
await browser.close();
}
} finally {
abortController.abort();
await projectFileServer.close;
}
});