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M. George Hansen 2025-08-15 14:00:52 +12:00
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58
packages/i18n/tests/features/locale-detection.test.ts Normal file
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import assert from "node:assert/strict";
import { beforeEach, describe, it } from "node:test";
import type I18n from "@websnacksjs/i18n";
import { type Fixtures, withFixture } from "../fixtures.ts";
let i18n: I18n<Fixtures["base"]>;
beforeEach(() => {
i18n = withFixture("base");
});
describe("when run in a server environment", () => {
it("throws an error when locale is not specified", async () => {
await assert.rejects(
i18n.loadMessages(),
"unable to auto detect locale in non-browser environment (did you supply a locale argument?)",
);
});
});
describe("when run in a browser environment w/ supported locale in <html> lang attrbute", () => {
beforeEach(() => {
Object.defineProperty(globalThis, "document", {
value: {
documentElement: {
lang: "fr",
},
} as Document,
});
return () => {
delete (globalThis as { document?: Document }).document;
};
});
it("loads appropriate messages for that auto detected locale", async () => {
const t = await i18n.loadMessages();
assert.equal(t("denial"), "Je ne l'ai pas frappée. Je ne l'ai pas.");
});
});
describe("when run in a browser environment w/ supported locale in Navigator.languages", () => {
beforeEach(() => {
Object.defineProperty(globalThis, "navigator", {
value: {
languages: ["de-Latn-DE", "fr-Latn-FR"],
},
});
return () => {
delete (globalThis as { navigator?: Navigator }).navigator;
};
});
it("loads appropriate messages for that auto detected locale", async () => {
const t = await i18n.loadMessages();
assert.equal(t("denial"), "Je ne l'ai pas frappée. Je ne l'ai pas.");
});
});