medassist-ng/backend/src/test/translations.test.ts

/**
 * Tests for translations module
 */
import { describe, expect, it } from "vitest";
import { getDateLocale, getTranslations, type Language, t } from "../i18n/translations.js";

describe("Translations Module", () => {
	describe("getTranslations", () => {
		it("should return English translations for 'en'", () => {
			const translations = getTranslations("en");
			expect(translations.stockReminder.title).toContain("MedAssist-ng");
			expect(translations.common.pills).toBe("pills");
		});

		it("should return German translations for 'de'", () => {
			const translations = getTranslations("de");
			expect(translations.stockReminder.title).toContain("MedAssist-ng");
			expect(translations.common.pills).toBe("Tabletten");
		});

		it("should fallback to English for unknown language", () => {
			const translations = getTranslations("fr" as Language);
			expect(translations.common.pills).toBe("pills");
		});

		it("should have all required keys in English", () => {
			const translations = getTranslations("en");

			// Stock reminder keys
			expect(translations.stockReminder.subject).toBeDefined();
			expect(translations.stockReminder.title).toBeDefined();
			expect(translations.stockReminder.description).toBeDefined();
			expect(translations.stockReminder.tableHeaders.medication).toBeDefined();

			// Intake reminder keys
			expect(translations.intakeReminder.subject).toBeDefined();
			expect(translations.intakeReminder.title).toBeDefined();
			expect(translations.intakeReminder.pills).toBeDefined();
			expect(translations.intakeReminder.takenBy).toBeDefined();

			// Push notification keys
			expect(translations.push.stockTitle).toBeDefined();
			expect(translations.push.intakeTitle).toBeDefined();
			expect(translations.push.pillsLeft).toBeDefined();
			expect(translations.push.emptySection).toBeDefined();
			expect(translations.push.lowSection).toBeDefined();
		});

		it("should have all required keys in German", () => {
			const translations = getTranslations("de");

			// Stock reminder keys
			expect(translations.stockReminder.subject).toBeDefined();
			expect(translations.stockReminder.title).toBeDefined();
			expect(translations.stockReminder.description).toBeDefined();
			expect(translations.stockReminder.tableHeaders.medication).toBe("Medikament");

			// Intake reminder keys
			expect(translations.intakeReminder.subject).toBeDefined();
			expect(translations.intakeReminder.pills).toBe("Tabletten");
			expect(translations.intakeReminder.takenBy).toBe("für {name}");
		});
	});

	describe("t (template function)", () => {
		it("should replace single placeholder", () => {
			const result = t("Hello {name}!", { name: "World" });
			expect(result).toBe("Hello World!");
		});

		it("should replace multiple placeholders", () => {
			const result = t("{count} {type} running critically low", { count: 3, type: "medications" });
			expect(result).toBe("3 medications running critically low");
		});

		it("should replace same placeholder multiple times", () => {
			const result = t("{name} and {name} again", { name: "test" });
			expect(result).toBe("test and test again");
		});

		it("should leave unmatched placeholders", () => {
			const result = t("Hello {name}!", {});
			expect(result).toBe("Hello {name}!");
		});

		it("should handle numeric values", () => {
			const result = t("{count} pills left", { count: 42 });
			expect(result).toBe("42 pills left");
		});

		it("should handle empty params object", () => {
			const result = t("No placeholders here", {});
			expect(result).toBe("No placeholders here");
		});

		it("should work with real translation strings", () => {
			const translations = getTranslations("en");

			// Stock reminder subject
			const subject = t(translations.stockReminder.subject, { count: 3, s: "s" });
			expect(subject).toBe("MedAssist-ng Auto-Reminder: 3 Medications Running Critically Low");

			// Intake reminder description
			const description = t(translations.intakeReminder.description, { minutes: 30 });
			expect(description).toBe("Time to take your medication in 30 minutes:");

			// Push notification
			const push = t(translations.push.pillsAt, { count: 2, time: "08:00" });
			expect(push).toBe("2 pills at 08:00");
		});

		it("should work with German translations", () => {
			const translations = getTranslations("de");

			const subject = t(translations.stockReminder.subject, { count: 2, e: "e" });
			expect(subject).toBe("MedAssist-ng Auto-Erinnerung: 2 Medikamente kritisch niedrig");

			const takenBy = t(translations.intakeReminder.takenBy, { name: "Daniel" });
			expect(takenBy).toBe("für Daniel");
		});
	});

	describe("getDateLocale", () => {
		it("should return 'en-US' for English", () => {
			expect(getDateLocale("en")).toBe("en-US");
		});

		it("should return 'de-DE' for German", () => {
			expect(getDateLocale("de")).toBe("de-DE");
		});

		it("should return 'en-US' for unknown language", () => {
			expect(getDateLocale("fr" as Language)).toBe("en-US");
		});
	});
});