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

7 files changed, 207 insertions, 30 deletions

diff --git a/packages/frontend/package.json b/packages/frontend/package.json
index e4c04f5937..add5eabdda 100644
--- a/packages/frontend/package.json
+++ b/packages/frontend/package.json
@@ -4,6 +4,8 @@
 	"scripts": {
 		"watch": "vite",
 		"build": "vite build",
+		"test": "vitest --run",
+		"test-and-coverage": "vitest --run --coverage",
 		"typecheck": "vue-tsc --noEmit",
 		"eslint": "eslint --quiet \"src/**/*.{ts,vue}\"",
 		"lint": "pnpm typecheck && pnpm eslint"
@@ -70,6 +72,7 @@
 		"vuedraggable": "next"
 	},
 	"devDependencies": {
+		"@testing-library/vue": "^6.6.1",
 		"@types/escape-regexp": "0.0.1",
 		"@types/gulp": "4.0.10",
 		"@types/gulp-rename": "2.0.1",
@@ -85,13 +88,16 @@
 		"@types/ws": "8.5.4",
 		"@typescript-eslint/eslint-plugin": "5.53.0",
 		"@typescript-eslint/parser": "5.53.0",
+		"@vitest/coverage-c8": "^0.29.2",
 		"@vue/runtime-core": "3.2.47",
 		"cross-env": "7.0.3",
 		"cypress": "12.7.0",
 		"eslint": "8.35.0",
 		"eslint-plugin-import": "2.27.5",
 		"eslint-plugin-vue": "9.9.0",
+		"happy-dom": "8.9.0",
 		"start-server-and-test": "1.15.4",
+		"vitest": "^0.29.2",
 		"vue-eslint-parser": "9.1.0",
 		"vue-tsc": "1.2.0"
 	}
diff --git a/packages/frontend/src/components/MkMediaImage.vue b/packages/frontend/src/components/MkMediaImage.vue
index b777a1329b..6091b40016 100644
--- a/packages/frontend/src/components/MkMediaImage.vue
+++ b/packages/frontend/src/components/MkMediaImage.vue
@@ -3,21 +3,24 @@
 	<ImgWithBlurhash style="filter: brightness(0.5);" :hash="image.blurhash" :title="image.comment" :alt="image.comment"/>
 	<div :class="$style.hiddenText">
 		<div :class="$style.hiddenTextWrapper">
-			<b style="display: block;"><i class="ti ti-alert-triangle"></i> {{ $ts.sensitive }}</b>
-			<span style="display: block;">{{ $ts.clickToShow }}</span>
+			<b style="display: block;"><i class="ti ti-alert-triangle"></i> {{ i18n.ts.sensitive }}</b>
+			<span style="display: block;">{{ i18n.ts.clickToShow }}</span>
 		</div>
 	</div>
 </div>
-<div v-else :class="$style.visible" :style="defaultStore.state.darkMode ? '--c: rgb(255 255 255 / 2%);' : '--c: rgb(0 0 0 / 2%);'">
+<div v-else :class="$style.visible" :style="darkMode ? '--c: rgb(255 255 255 / 2%);' : '--c: rgb(0 0 0 / 2%);'">
 	<a
 		:class="$style.imageContainer"
 		:href="image.url"
 		:title="image.name"
 	>
 		<ImgWithBlurhash :hash="image.blurhash" :src="url" :alt="image.comment || image.name" :title="image.comment || image.name" :cover="false"/>
-		<div v-if="image.type === 'image/gif'" :class="$style.gif">GIF</div>
 	</a>
-	<button v-tooltip="$ts.hide" :class="$style.hide" class="_button" @click="hide = true"><i class="ti ti-eye-off"></i></button>
+	<div :class="$style.indicators">
+		<div v-if="['image/gif', 'image/apng'].includes(image.type)" :class="$style.indicator">GIF</div>
+		<div v-if="image.comment" :class="$style.indicator">ALT</div>
+	</div>
+	<button v-tooltip="i18n.ts.hide" :class="$style.hide" class="_button" @click="hide = true"><i class="ti ti-eye-off"></i></button>
 </div>
 </template>
 
@@ -27,6 +30,7 @@ import * as misskey from 'misskey-js';
 import { getStaticImageUrl } from '@/scripts/media-proxy';
 import ImgWithBlurhash from '@/components/MkImgWithBlurhash.vue';
 import { defaultStore } from '@/store';
+import { i18n } from '@/i18n';
 
 const props = defineProps<{
 	image: misskey.entities.DriveFile;
@@ -34,6 +38,7 @@ const props = defineProps<{
 }>();
 
 let hide = $ref(true);
+let darkMode = $ref(defaultStore.state.darkMode);
 
 const url = (props.raw || defaultStore.state.loadRawImages)
 	? props.image.url
@@ -108,18 +113,25 @@ watch(() => props.image, () => {
 	background-repeat: no-repeat;
 }
 
-.gif {
-	background-color: var(--fg);
+.indicators {
+	display: inline-flex;
+	position: absolute;
+	top: 12px;
+	left: 12px;
+	text-align: center;
+	pointer-events: none;
+	opacity: .5;
+	font-size: 14px;
+	gap: 6px;
+}
+
+.indicator {
+	/* Hardcode to black because either --bg or --fg makes it hard to read in dark/light mode */
+	background-color: black;
 	border-radius: 6px;
 	color: var(--accentLighten);
 	display: inline-block;
-	font-size: 14px;
 	font-weight: bold;
-	left: 12px;
-	opacity: .5;
 	padding: 0 6px;
-	text-align: center;
-	top: 12px;
-	pointer-events: none;
 }
 </style>
diff --git a/packages/frontend/src/directives/index.ts b/packages/frontend/src/directives/index.ts
index 854f0a544e..064ee4f64b 100644
--- a/packages/frontend/src/directives/index.ts
+++ b/packages/frontend/src/directives/index.ts
@@ -14,17 +14,23 @@ import adaptiveBg from './adaptive-bg';
 import container from './container';
 
 export default function(app: App) {
-	app.directive('userPreview', userPreview);
-	app.directive('user-preview', userPreview);
-	app.directive('get-size', getSize);
-	app.directive('ripple', ripple);
-	app.directive('tooltip', tooltip);
-	app.directive('hotkey', hotkey);
-	app.directive('appear', appear);
-	app.directive('anim', anim);
-	app.directive('click-anime', clickAnime);
-	app.directive('panel', panel);
-	app.directive('adaptive-border', adaptiveBorder);
-	app.directive('adaptive-bg', adaptiveBg);
-	app.directive('container', container);
+	for (const [key, value] of Object.entries(directives)) {
+		app.directive(key, value);
+	}
 }
+
+export const directives = {
+	'userPreview': userPreview,
+	'user-preview': userPreview,
+	'get-size': getSize,
+	'ripple': ripple,
+	'tooltip': tooltip,
+	'hotkey': hotkey,
+	'appear': appear,
+	'anim': anim,
+	'click-anime': clickAnime,
+	'panel': panel,
+	'adaptive-border': adaptiveBorder,
+	'adaptive-bg': adaptiveBg,
+	'container': container,
+};
diff --git a/packages/frontend/test/init.ts b/packages/frontend/test/init.ts
new file mode 100644
index 0000000000..96730e7b56
--- /dev/null
+++ b/packages/frontend/test/init.ts
@@ -0,0 +1,18 @@
+import { vi } from 'vitest';
+
+// Set i18n
+import locales from '../../../locales';
+import { updateI18n } from '@/i18n';
+updateI18n(locales['en-US']);
+
+// XXX: misskey-js panics if WebSocket is not defined
+vi.stubGlobal('WebSocket', class WebSocket extends EventTarget { static CLOSING = 2; });
+
+// XXX: defaultStore somehow becomes undefined in vitest?
+vi.mock('@/store.js', () => {
+	return {
+		defaultStore: {
+			state: {},
+		},
+	};
+});
diff --git a/packages/frontend/test/note.test.ts b/packages/frontend/test/note.test.ts
new file mode 100644
index 0000000000..f7c47ec100
--- /dev/null
+++ b/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);
+	});
+});
diff --git a/packages/frontend/test/tsconfig.json b/packages/frontend/test/tsconfig.json
new file mode 100644
index 0000000000..1424fdbdfb
--- /dev/null
+++ b/packages/frontend/test/tsconfig.json
@@ -0,0 +1,43 @@
+{
+	"compilerOptions": {
+		"allowJs": true,
+		"noEmitOnError": false,
+		"noImplicitAny": true,
+		"noImplicitReturns": true,
+		"noUnusedParameters": false,
+		"noUnusedLocals": true,
+		"noFallthroughCasesInSwitch": true,
+		"declaration": false,
+		"sourceMap": true,
+		"target": "es2021",
+		"module": "es2020",
+		"moduleResolution": "node",
+		"allowSyntheticDefaultImports": true,
+		"removeComments": false,
+		"noLib": false,
+		"strict": true,
+		"strictNullChecks": true,
+		"strictPropertyInitialization": false,
+		"experimentalDecorators": true,
+		"emitDecoratorMetadata": true,
+		"resolveJsonModule": true,
+		"isolatedModules": true,
+		"baseUrl": "./",
+		"paths": {
+			"@/*": ["../src/*"]
+		},
+		"typeRoots": [
+			"../node_modules/@types",
+		],
+		"lib": [
+			"esnext",
+			"dom"
+		],
+		"types": ["node"]
+	},
+	"compileOnSave": false,
+	"include": [
+		"./**/*.ts",
+		"../src/**/*.vue",
+	]
+}
diff --git a/packages/frontend/vite.config.ts b/packages/frontend/vite.config.ts
index 89b6dbde25..a90ee55268 100644
--- a/packages/frontend/vite.config.ts
+++ b/packages/frontend/vite.config.ts
@@ -1,6 +1,7 @@
 import path from 'path';
 import pluginVue from '@vitejs/plugin-vue';
 import { defineConfig } from 'vite';
+import { configDefaults as vitestConfigDefaults } from 'vitest/config';
 
 import locales from '../../locales';
 import meta from '../../package.json';
@@ -16,10 +17,10 @@ const hash = (str: string, seed = 0): number => {
 		h1 = Math.imul(h1 ^ ch, 2654435761);
 		h2 = Math.imul(h2 ^ ch, 1597334677);
 	}
-	
+
 	h1 = Math.imul(h1 ^ (h1 >>> 16), 2246822507) ^ Math.imul(h2 ^ (h2 >>> 13), 3266489909);
 	h2 = Math.imul(h2 ^ (h2 >>> 16), 2246822507) ^ Math.imul(h1 ^ (h1 >>> 13), 3266489909);
-	
+
 	return 4294967296 * (2097151 & h2) + (h1 >>> 0);
 };
 
@@ -28,12 +29,12 @@ function toBase62(n: number): string {
 	if (n === 0) {
 		return '0';
 	}
-	let result = ''; 
+	let result = '';
 	while (n > 0) {
 		result = BASE62_DIGITS[n % BASE62_DIGITS.length] + result;
 		n = Math.floor(n / BASE62_DIGITS.length);
 	}
-	
+
 	return result;
 }
 
@@ -110,5 +111,15 @@ export default defineConfig(({ command, mode }) => {
 			sourcemap: process.env.NODE_ENV === 'development',
 			reportCompressedSize: false,
 		},
+
+		test: {
+			environment: 'happy-dom',
+			deps: {
+				inline: [
+					// XXX: misskey-dev/browser-image-resizer has no "type": "module"
+					'browser-image-resizer',
+				],
+			},
+		},
 	};
 });