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LibJS: Add the Number.prototype.toFixed method
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describe("correct behavior", () => {
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test("length", () => {
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expect(Number.prototype.toFixed).toHaveLength(1);
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});
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test("basic functionality", () => {
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[
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[0, 5, "0.00000"],
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[Infinity, 6, "Infinity"],
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[-Infinity, 7, "-Infinity"],
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[NaN, 8, "NaN"],
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[12.81646112, 3, "12.816"],
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[84.23, 4, "84.2300"],
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[3.00003, 5, "3.00003"],
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// Numbers >= 1e+21
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[1e21, 5, "1e+21"],
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[1e22, 0, "1e+22"],
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].forEach(testCase => {
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expect(testCase[0].toFixed(testCase[1])).toBe(testCase[2]);
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});
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});
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test("decimal fixed digits gets converted to int", () => {
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expect((30.521).toFixed(1.9)).toBe("30.5");
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expect((30.521).toFixed(2.2)).toBe("30.52");
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});
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});
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test("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.toFixed.call(value)).toThrowWithMessage(
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TypeError,
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"Not a Number object"
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);
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});
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});
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test("fixed digits RangeError", () => {
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[-Infinity, -5, 105, Infinity, NaN].forEach(value => {
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expect(() => (0).toFixed(value)).toThrow(RangeError);
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});
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});
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});
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