1 files changed, 52 insertions, 0 deletions
diff --git a/packages/frontend/test/i18n.test.ts b/packages/frontend/test/i18n.test.ts
new file mode 100644
index 0000000000..e1cab1f15f
--- /dev/null
+++ b/packages/frontend/test/i18n.test.ts
@@ -0,0 +1,52 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { describe, expect, it } from 'vitest';
+import { I18n } from '@/scripts/i18n.js';
+import { ParameterizedString } from '../../../locales/index.js';
+
+describe('i18n', () => {
+	it('t', () => {
+		const i18n = new I18n({
+			foo: 'foo',
+			bar: {
+				baz: 'baz',
+				qux: 'qux {0}' as unknown as ParameterizedString<'0'>,
+				quux: 'quux {0} {1}' as unknown as ParameterizedString<'0' | '1'>,
+			},
+		});
+
+		expect(i18n.t('foo')).toBe('foo');
+		expect(i18n.t('bar.baz')).toBe('baz');
+		expect(i18n.tsx.bar.qux({ 0: 'hoge' })).toBe('qux hoge');
+		expect(i18n.tsx.bar.quux({ 0: 'hoge', 1: 'fuga' })).toBe('quux hoge fuga');
+	});
+	it('ts', () => {
+		const i18n = new I18n({
+			foo: 'foo',
+			bar: {
+				baz: 'baz',
+				qux: 'qux {0}' as unknown as ParameterizedString<'0'>,
+				quux: 'quux {0} {1}' as unknown as ParameterizedString<'0' | '1'>,
+			},
+		});
+
+		expect(i18n.ts.foo).toBe('foo');
+		expect(i18n.ts.bar.baz).toBe('baz');
+	});
+	it('tsx', () => {
+		const i18n = new I18n({
+			foo: 'foo',
+			bar: {
+				baz: 'baz',
+				qux: 'qux {0}' as unknown as ParameterizedString<'0'>,
+				quux: 'quux {0} {1}' as unknown as ParameterizedString<'0' | '1'>,
+			},
+		});
+
+		expect(i18n.tsx.bar.qux({ 0: 'hoge' })).toBe('qux hoge');
+		expect(i18n.tsx.bar.quux({ 0: 'hoge', 1: 'fuga' })).toBe('quux hoge fuga');
+	});
+});