rudeshark.net/packages/backend/test/mfm.ts

import * as assert from "assert";
import * as mfm from "mfm-js";

import { fromHtml } from "../src/mfm/from-html.js";
import { toHtml } from "../src/mfm/to-html.js";

describe("toHtml", () => {
	it("br", () => {
		const input = "foo\nbar\nbaz";
		const output = "<p><span>foo<br>bar<br>baz</span></p>";
		assert.equal(toHtml(mfm.parse(input)), output);
	});

	it("br alt", () => {
		const input = "foo\r\nbar\rbaz";
		const output = "<p><span>foo<br>bar<br>baz</span></p>";
		assert.equal(toHtml(mfm.parse(input)), output);
	});
});

describe("fromHtml", () => {
	it("p", () => {
		assert.deepStrictEqual(fromHtml("<p>a</p><p>b</p>"), "a\n\nb");
	});

	it("block element", () => {
		assert.deepStrictEqual(fromHtml("<div>a</div><div>b</div>"), "a\nb");
	});

	it("inline element", () => {
		assert.deepStrictEqual(fromHtml("<ul><li>a</li><li>b</li></ul>"), "a\nb");
	});

	it("block code", () => {
		assert.deepStrictEqual(
			fromHtml("<pre><code>a\nb</code></pre>"),
			"```\na\nb\n```",
		);
	});

	it("inline code", () => {
		assert.deepStrictEqual(fromHtml("<code>a</code>"), "`a`");
	});

	it("quote", () => {
		assert.deepStrictEqual(
			fromHtml("<blockquote>a\nb</blockquote>"),
			"> a\n> b",
		);
	});

	it("br", () => {
		assert.deepStrictEqual(fromHtml("<p>abc<br><br/>d</p>"), "abc\n\nd");
	});

	it("link with different text", () => {
		assert.deepStrictEqual(
			fromHtml('<p>a <a href="https://joinfirefish.org/b">c</a> d</p>'),
			"a [c](https://joinfirefish.org/b) d",
		);
	});

	it("link with different text, but not encoded", () => {
		assert.deepStrictEqual(
			fromHtml('<p>a <a href="https://joinfirefish.org/ä">c</a> d</p>'),
			"a [c](<https://joinfirefish.org/ä>) d",
		);
	});

	it("link with same text", () => {
		assert.deepStrictEqual(
			fromHtml(
				'<p>a <a href="https://joinfirefish.org/b">https://joinfirefish.org/b</a> d</p>',
			),
			"a https://joinfirefish.org/b d",
		);
	});

	it("link with same text, but not encoded", () => {
		assert.deepStrictEqual(
			fromHtml(
				'<p>a <a href="https://joinfirefish.org/ä">https://joinfirefish.org/ä</a> d</p>',
			),
			"a <https://joinfirefish.org/ä> d",
		);
	});

	it("link with no url", () => {
		assert.deepStrictEqual(
			fromHtml('<p>a <a href="b">c</a> d</p>'),
			"a [c](b) d",
		);
	});

	it("link without href", () => {
		assert.deepStrictEqual(fromHtml("<p>a <a>c</a> d</p>"), "a c d");
	});

	it("link without text", () => {
		assert.deepStrictEqual(
			fromHtml('<p>a <a href="https://joinfirefish.org/b"></a> d</p>'),
			"a https://joinfirefish.org/b d",
		);
	});

	it("link without both", () => {
		assert.deepStrictEqual(fromHtml("<p>a <a></a> d</p>"), "a  d");
	});

	it("mention", () => {
		assert.deepStrictEqual(
			fromHtml(
				'<p>a <a href="https://joinfirefish.org/@user" class="u-url mention">@user</a> d</p>',
			),
			"a @user@joinfirefish.org d",
		);
	});

	it("hashtag", () => {
		assert.deepStrictEqual(
			fromHtml('<p>a <a href="https://joinfirefish.org/tags/a">#a</a> d</p>', [
				"#a",
			]),
			"a #a d",
		);
	});
});