test: add tests for i18n

tests/i18n.test.ts

@@ -0,0 +1,41 @@
+import {expect, test} from "@playwright/test";
+
+const localeCodes = ['uk', 'en'] as const
+
+const locales = await Promise.all(localeCodes.map(async code => ({
+    code,
+    messages: (await import(`../dist/_locales/${code}/messages.json`, {assert: {type: 'json'}})).default
+})))
+
+test('All keys in all localizations must be the same', () => {
+    const expectedKeys = Object.keys(locales[0].messages)
+    for (let i = 1; i < locales.length; i++) {
+        expect(Object.keys(locales[i].messages), `Locale "${locales[i].code}" doesn't match locale "${locales[0].code}"`).toEqual(expectedKeys)
+    }
+})
+
+
+test.only('Messages do not have to have the same values in different locales', () => {
+
+    const messagesMap: Record<string, { code: typeof localeCodes[number], value: string }[]> = {}
+
+    for (const {code, messages} of locales) {
+        for (const messagesKey in messages) {
+
+            if (!messagesMap[messagesKey]) {
+                messagesMap[messagesKey] = []
+            }
+
+            if (messagesMap[messagesKey].length) {
+                for (const localeToCompare of messagesMap[messagesKey]) {
+                    expect(localeToCompare.value, `Locale "${code}" have equal value for key "${messagesKey}" in locale "${localeToCompare.code}"`).not.toEqual(messages[messagesKey].message)
+                }
+            }
+
+            messagesMap[messagesKey].push({
+                code,
+                value: messages[messagesKey].message
+            })
+        }
+    }
+})