app/utils/i18n.test.ts

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import i18n from "i18next";
import de_DE from "../../shared/i18n/locales/de_DE/translation.json";
import en_US from "../../shared/i18n/locales/en_US/translation.json";
import pt_PT from "../../shared/i18n/locales/pt_PT/translation.json";

// i18n is already initialized globally via app/test/setup.ts — only add
// test resources here, without re-initializing the singleton.
beforeAll(() => {
  i18n
    .addResources("en-US", "translation", en_US)
    .addResources("de-DE", "translation", de_DE)
    .addResources("pt-PT", "translation", pt_PT);
});

describe("i18n env is unset", () => {
  beforeEach(async () => {
    await i18n.changeLanguage("en-US");
  });

  it("translation of key should match", () =>
    expect(i18n.t("Saving")).toBe("Saving"));

  it("translation if changed to de-DE", async () => {
    await i18n.changeLanguage("de-DE");
    expect(i18n.t("Saving")).toBe("Speichert");
  });

  it("translation if changed to pt-PT", async () => {
    await i18n.changeLanguage("pt-PT");
    expect(i18n.t("Saving")).toBe("A guardar");
  });
});

describe("i18n env is en-US", () => {
  beforeEach(async () => {
    await i18n.changeLanguage("en-US");
  });

  it("translation of key should match", () =>
    expect(i18n.t("Saving")).toBe("Saving"));

  it("translation if changed to de-DE", async () => {
    await i18n.changeLanguage("de-DE");
    expect(i18n.t("Saving")).toBe("Speichert");
  });

  it("translation if changed to pt-PT", async () => {
    await i18n.changeLanguage("pt-PT");
    expect(i18n.t("Saving")).toBe("A guardar");
  });
});

describe("i18n env is de-DE", () => {
  beforeEach(async () => {
    await i18n.changeLanguage("de-DE");
  });

  it("translation of key should match", () =>
    expect(i18n.t("Saving")).toBe("Speichert"));

  it("translation if changed to en-US", async () => {
    await i18n.changeLanguage("en-US");
    expect(i18n.t("Saving")).toBe("Saving");
  });

  it("translation if changed to pt-PT", async () => {
    await i18n.changeLanguage("pt-PT");
    expect(i18n.t("Saving")).toBe("A guardar");
  });
});

describe("i18n env is pt-PT", () => {
  beforeEach(async () => {
    await i18n.changeLanguage("pt-PT");
  });

  it("translation of key should match", () =>
    expect(i18n.t("Saving")).toBe("A guardar"));

  it("translation if changed to en-US", async () => {
    await i18n.changeLanguage("en-US");
    expect(i18n.t("Saving")).toBe("Saving");
  });

  it("translation if changed to de-DE", async () => {
    await i18n.changeLanguage("de-DE");
    expect(i18n.t("Saving")).toBe("Speichert");
  });
});