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LibJS: Implement Intl.getCanonicalLocales
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describe("errors", () => {
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test("invalid tag", () => {
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expect(() => {
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Intl.getCanonicalLocales("EN_US");
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}).toThrowWithMessage(RangeError, "EN_US is not a structurally valid language tag");
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});
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test("root tag", () => {
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expect(() => {
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Intl.getCanonicalLocales("root");
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}).toThrowWithMessage(RangeError, "root is not a structurally valid language tag");
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});
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test("no language tag", () => {
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expect(() => {
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Intl.getCanonicalLocales("Latn");
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}).toThrowWithMessage(RangeError, "Latn is not a structurally valid language tag");
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});
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test("duplicate variant subtags", () => {
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expect(() => {
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Intl.getCanonicalLocales("en-POSIX-POSIX");
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}).toThrowWithMessage(
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RangeError,
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"en-POSIX-POSIX is not a structurally valid language tag"
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);
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});
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test("improperly placed separator", () => {
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expect(() => {
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Intl.getCanonicalLocales("en-");
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}).toThrowWithMessage(RangeError, "en- is not a structurally valid language tag");
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expect(() => {
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Intl.getCanonicalLocales("-en");
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}).toThrowWithMessage(RangeError, "-en is not a structurally valid language tag");
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expect(() => {
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Intl.getCanonicalLocales("en--US");
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}).toThrowWithMessage(RangeError, "en--US is not a structurally valid language tag");
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});
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test("non string or object locale", () => {
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expect(() => {
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Intl.getCanonicalLocales([true]);
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}).toThrowWithMessage(TypeError, "true is neither an object nor a string");
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});
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});
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describe("normal behavior", () => {
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test("length is 1", () => {
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expect(Intl.getCanonicalLocales).toHaveLength(1);
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});
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test("valid locales", () => {
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expect(Intl.getCanonicalLocales([])).toEqual([]);
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expect(Intl.getCanonicalLocales("EN-US")).toEqual(["en-US"]);
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expect(Intl.getCanonicalLocales(["EN-US"])).toEqual(["en-US"]);
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expect(Intl.getCanonicalLocales(["EN-US", "Fr"])).toEqual(["en-US", "fr"]);
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expect(Intl.getCanonicalLocales("EN-lATN-US")).toEqual(["en-Latn-US"]);
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expect(Intl.getCanonicalLocales("EN-US-POSIX")).toEqual(["en-US-posix"]);
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expect(Intl.getCanonicalLocales("EN-LATN-US-POSIX")).toEqual(["en-Latn-US-posix"]);
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});
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test("duplicate locales", () => {
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expect(Intl.getCanonicalLocales(["EN-US", "en-US", "en-us"])).toEqual(["en-US"]);
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});
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test("non-array object", () => {
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expect(Intl.getCanonicalLocales({})).toEqual([]);
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expect(Intl.getCanonicalLocales({ en: 123 })).toEqual([]);
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expect(Intl.getCanonicalLocales(undefined)).toEqual([]);
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expect(Intl.getCanonicalLocales(true)).toEqual([]);
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expect(Intl.getCanonicalLocales(123)).toEqual([]);
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});
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});
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