@inlang/paraglide-js/dist/compiler/runtime/extract-locale-from-navigator.test.js

[](https://inlang.com)

import { newProject } from "@inlang/sdk";
import { expect, test } from "vitest";
import { createParaglide } from "../create-paraglide.js";
test("returns the preferred locale from navigator.languages", async () => {
    const originalNavigator = globalThis.navigator;
    const runtime = await createParaglide({
        blob: await newProject({
            settings: {
                baseLocale: "en",
                locales: ["en", "fr", "de"],
            },
        }),
        isServer: "false",
        strategy: ["preferredLanguage"],
    });
    // Mock navigator.languages
    Object.defineProperty(globalThis, "navigator", {
        value: {
            languages: ["fr-FR", "en-US", "de"],
        },
        configurable: true,
    });
    expect(runtime.getLocale()).toBe("fr");
    // Restore original navigator
    Object.defineProperty(globalThis, "navigator", {
        value: originalNavigator,
        configurable: true,
    });
});