| 1 | import { describe, expect, it } from "vitest"; |
| 2 | import { detectLocaleFromHeaders, matchLocaleTag } from "./detect"; |
| 3 | |
| 4 | describe("matchLocaleTag", () => { |
| 5 | it("matches exact full tags case-insensitively", () => { |
| 6 | expect(matchLocaleTag("pt-BR")).toBe("pt-BR"); |
| 7 | expect(matchLocaleTag("PT-br")).toBe("pt-BR"); |
| 8 | expect(matchLocaleTag("ru")).toBe("ru"); |
| 9 | expect(matchLocaleTag("uk")).toBe("uk"); |
| 10 | }); |
| 11 | |
| 12 | it("maps regional variants to the routed base tag", () => { |
| 13 | expect(matchLocaleTag("ru-RU")).toBe("ru"); |
| 14 | expect(matchLocaleTag("uk-UA")).toBe("uk"); |
| 15 | expect(matchLocaleTag("es-MX")).toBe("es"); |
| 16 | expect(matchLocaleTag("es-419")).toBe("es"); |
| 17 | expect(matchLocaleTag("zh-Hant")).toBe("zh"); |
| 18 | expect(matchLocaleTag("zh-TW")).toBe("zh"); |
| 19 | expect(matchLocaleTag("ja-JP")).toBe("ja"); |
| 20 | expect(matchLocaleTag("ko-KR")).toBe("ko"); |
| 21 | expect(matchLocaleTag("vi-VN")).toBe("vi"); |
| 22 | expect(matchLocaleTag("id-ID")).toBe("id"); |
| 23 | }); |
| 24 | |
| 25 | it("routes pt to the only shipped Portuguese variant", () => { |
| 26 | expect(matchLocaleTag("pt")).toBe("pt-BR"); |
| 27 | expect(matchLocaleTag("pt-PT")).toBe("pt-BR"); |
| 28 | }); |
| 29 | |
| 30 | it("rejects unrouted and empty tags deterministically", () => { |
| 31 | expect(matchLocaleTag("fr")).toBeNull(); |
| 32 | expect(matchLocaleTag("de-DE")).toBeNull(); |
| 33 | expect(matchLocaleTag("ar")).toBeNull(); |
| 34 | expect(matchLocaleTag("")).toBeNull(); |
| 35 | expect(matchLocaleTag("*")).toBeNull(); |
| 36 | }); |
| 37 | }); |
| 38 | |
| 39 | describe("detectLocaleFromHeaders", () => { |
| 40 | it("prefers an explicit cookie choice over Accept-Language", () => { |
| 41 | expect(detectLocaleFromHeaders("ru", "ja,en;q=0.8")).toBe("ru"); |
| 42 | }); |
| 43 | |
| 44 | it("ignores stale cookies for unrouted locales", () => { |
| 45 | expect(detectLocaleFromHeaders("fr", "uk,en;q=0.8")).toBe("uk"); |
| 46 | }); |
| 47 | |
| 48 | it("honors Accept-Language preference order", () => { |
| 49 | expect(detectLocaleFromHeaders(undefined, "fr,vi;q=0.9,ru;q=0.8")).toBe("vi"); |
| 50 | expect(detectLocaleFromHeaders(undefined, "de,pt;q=0.7")).toBe("pt-BR"); |
| 51 | }); |
| 52 | |
| 53 | it("falls back to the default locale with no signal", () => { |
| 54 | expect(detectLocaleFromHeaders(undefined, null)).toBe("en"); |
| 55 | expect(detectLocaleFromHeaders(undefined, "")).toBe("en"); |
| 56 | expect(detectLocaleFromHeaders(undefined, "fr,de;q=0.8")).toBe("en"); |
| 57 | }); |
| 58 | }); |
| 59 |