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LibJS: Implement ECMA-402 Number.prototype.toLocaleString
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3 changed files with 106 additions and 0 deletions
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describe("errors", () => {
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test("must be called with numeric |this|", () => {
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[true, [], {}, Symbol("foo"), "bar", 1n].forEach(value => {
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expect(() => Number.prototype.toLocaleString.call(value)).toThrowWithMessage(
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TypeError,
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"Not an object of type Number"
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);
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});
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});
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});
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describe("correct behavior", () => {
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test("length", () => {
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expect(Number.prototype.toLocaleString).toHaveLength(0);
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});
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});
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describe("special values", () => {
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test("NaN", () => {
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expect(NaN.toLocaleString()).toBe("NaN");
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expect(NaN.toLocaleString("en")).toBe("NaN");
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expect(NaN.toLocaleString("ar")).toBe("ليس رقم");
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});
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test("Infinity", () => {
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expect(Infinity.toLocaleString()).toBe("∞");
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expect(Infinity.toLocaleString("en")).toBe("∞");
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expect(Infinity.toLocaleString("ar")).toBe("∞");
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});
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});
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describe("styles", () => {
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test("decimal", () => {
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expect((12).toLocaleString("en")).toBe("12");
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expect((12).toLocaleString("ar")).toBe("\u0661\u0662");
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});
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test("percent", () => {
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expect((0.234).toLocaleString("en", { style: "percent" })).toBe("23%");
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expect((0.234).toLocaleString("ar", { style: "percent" })).toBe("\u0662\u0663\u066a\u061c");
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});
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test("currency", () => {
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expect(
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(1.23).toLocaleString("en", {
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style: "currency",
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currency: "USD",
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currencyDisplay: "name",
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})
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).toBe("1.23 US dollars");
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expect(
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(1.23).toLocaleString("ar", {
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style: "currency",
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currency: "USD",
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currencyDisplay: "name",
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})
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).toBe("\u0661\u066b\u0662\u0663 دولار أمريكي");
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});
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test("unit", () => {
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expect(
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(1.23).toLocaleString("en", {
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style: "unit",
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unit: "kilometer-per-hour",
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unitDisplay: "long",
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})
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).toBe("1.23 kilometers per hour");
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expect(
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(1.23).toLocaleString("ar", {
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style: "unit",
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unit: "kilometer-per-hour",
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unitDisplay: "long",
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})
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).toBe("\u0661\u066b\u0662\u0663 كيلومتر في الساعة");
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});
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});
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