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crawler.test.js
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const { normalizeURL, getURLsFromHTML } = require("./crawler");
const { test, expect } = require("@jest/globals");
test("normalizeURL strip protocol", () => {
const input = "https://en.wikipedia.org/wiki/Big_O_notation";
const actual = normalizeURL(input);
const expected = "en.wikipedia.org/wiki/Big_O_notation";
expect(actual).toEqual(expected);
});
test("normalizeURL strip trailing slash", () => {
const input = "https://en.wikipedia.org/wiki/Big_O_notation/";
const actual = normalizeURL(input);
const expected = "en.wikipedia.org/wiki/Big_O_notation";
expect(actual).toEqual(expected);
});
test("normalizeURL capitals", () => {
const input = "https://en.WIKIPEDIA.org/wiki/Big_O_notation";
const actual = normalizeURL(input);
const expected = "en.wikipedia.org/wiki/Big_O_notation";
expect(actual).toEqual(expected);
});
test("normalizeURL strip http", () => {
const input = "http://en.wikipedia.org/wiki/Big_O_notation";
const actual = normalizeURL(input);
const expected = "en.wikipedia.org/wiki/Big_O_notation";
expect(actual).toEqual(expected);
});
// Get URL from HTML
test("getURLsFromHTML absolute", () => {
const inputHTMLBody = `
<html>
<body>
<a href="https://en.wikipedia.org/wiki/Big_O_notation">Wikipedia Big O Notation</a>
</body>
</html>
`;
const inputBaseURL = "https://en.wikipedia.org/wiki/Big_O_notation";
const actual = getURLsFromHTML(inputHTMLBody, inputBaseURL);
const expected = ["https://en.wikipedia.org/wiki/Big_O_notation"];
expect(actual).toEqual(expected);
});
test("getURLsFromHTML relative", () => {
const inputHTMLBody = `
<html>
<body>
<a href="/wiki/Big_O_notation">Wikipedia Big O Notation</a>
</body>
</html>
`;
const inputBaseURL = "https://en.wikipedia.org";
const actual = getURLsFromHTML(inputHTMLBody, inputBaseURL);
const expected = ["https://en.wikipedia.org/wiki/Big_O_notation"];
expect(actual).toEqual(expected);
});
test("getURLsFromHTML both", () => {
const inputHTMLBody = `
<html>
<body>
<a href="https://en.wikipedia.org/wiki/Big_O_notation">Wikipedia Big O Notation</a>
<a href="/wiki/Computer_science">Wikipedia Computer Science</a>
</body>
</html>
`;
const inputBaseURL = "https://en.wikipedia.org";
const actual = getURLsFromHTML(inputHTMLBody, inputBaseURL);
const expected = [
"https://en.wikipedia.org/wiki/Big_O_notation",
"https://en.wikipedia.org/wiki/Computer_science",
];
expect(actual).toEqual(expected);
});
test("getURLsFromHTML invalid url", () => {
const inputHTMLBody = `
<html>
<body>
<a href="Big_O_notation">Invalid URL</a>
</body>
</html>
`;
const inputBaseURL = "https://en.wikipedia.org/wiki/Big_O_notation";
const actual = getURLsFromHTML(inputHTMLBody, inputBaseURL);
const expected = [];
expect(actual).toEqual(expected);
});