fix(frontend): GIFバナーの復活など (#10247)

* Restore GIF banner

* Add ALT banner, detect APNG too

* Add vitest

* Add CI for vitest

* Upload coverage?

* frontend

packages/frontend/test/note.test.ts

@@ -0,0 +1,81 @@
+import { describe, test, assert, afterEach } from 'vitest';
+import { render, cleanup, type RenderResult } from '@testing-library/vue';
+import './init';
+import type { DriveFile } from 'misskey-js/built/entities';
+import { directives } from '@/directives';
+import MkMediaImage from '@/components/MkMediaImage.vue';
+
+describe('MkMediaImage', () => {
+	const renderMediaImage = (image: Partial<DriveFile>): RenderResult => {
+		return render(MkMediaImage, {
+			props: { image },
+			global: { directives },
+		});
+	};
+
+	afterEach(() => {
+		cleanup();
+	});
+
+	test('Attaching JPG should show no indicator', async () => {
+		const mkMediaImage = renderMediaImage({
+			type: 'image/jpeg',
+		});
+		const [gif, alt] = await Promise.all([
+			mkMediaImage.queryByText('GIF'),
+			mkMediaImage.queryByText('ALT'),
+		]);
+		assert.ok(!gif);
+		assert.ok(!alt);
+	});
+
+	test('Attaching GIF should show a GIF indicator', async () => {
+		const mkMediaImage = renderMediaImage({
+			type: 'image/gif',
+		});
+		const [gif, alt] = await Promise.all([
+			mkMediaImage.queryByText('GIF'),
+			mkMediaImage.queryByText('ALT'),
+		]);
+		assert.ok(gif);
+		assert.ok(!alt);
+	});
+
+	test('Attaching APNG should show a GIF indicator', async () => {
+		const mkMediaImage = renderMediaImage({
+			type: 'image/apng',
+		});
+		const [gif, alt] = await Promise.all([
+			mkMediaImage.queryByText('GIF'),
+			mkMediaImage.queryByText('ALT'),
+		]);
+		assert.ok(gif);
+		assert.ok(!alt);
+	});
+
+	test('Attaching image with an alt message should show an ALT indicator', async () => {
+		const mkMediaImage = renderMediaImage({
+			type: 'image/png',
+			comment: 'Misskeyのロゴです',
+		});
+		const [gif, alt] = await Promise.all([
+			mkMediaImage.queryByText('GIF'),
+			mkMediaImage.queryByText('ALT'),
+		]);
+		assert.ok(!gif);
+		assert.ok(alt);
+	});
+
+	test('Attaching GIF image with an alt message should show a GIF and an ALT indicator', async () => {
+		const mkMediaImage = renderMediaImage({
+			type: 'image/gif',
+			comment: 'Misskeyのロゴです',
+		});
+		const [gif, alt] = await Promise.all([
+			mkMediaImage.queryByText('GIF'),
+			mkMediaImage.queryByText('ALT'),
+		]);
+		assert.ok(gif);
+		assert.ok(alt);
+	});
+});