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019c529c07
This matches our coding style recommendation in CodingStyle.md, and matches our python formatting.
71 lines
2.3 KiB
JavaScript
71 lines
2.3 KiB
JavaScript
// This is necessary because we can't simply check if 0 is negative using equality,
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// since -0 === 0 evaluates to true.
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// test262 checks for negative zero in a similar way here:
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// https://github.com/tc39/test262/blob/main/test/built-ins/parseFloat/S15.1.2.3_A1_T2.js
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function isZeroNegative(x) {
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const isZero = x === 0;
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const isNegative = 1 / x === Number.NEGATIVE_INFINITY;
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return isZero && isNegative;
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}
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test("parsing numbers", () => {
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[
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[1, 1],
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[0.23, 0.23],
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[1.23, 1.23],
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[0.0123e2, 1.23],
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[1.23e4, 12300],
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[Infinity, Infinity],
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].forEach(test => {
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expect(parseFloat(test[0])).toBe(test[1]);
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expect(parseFloat(+test[0])).toBe(test[1]);
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expect(parseFloat(-test[0])).toBe(-test[1]);
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});
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});
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test("parsing zero", () => {
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expect(isZeroNegative(parseFloat("0"))).toBeFalse();
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expect(isZeroNegative(parseFloat("+0"))).toBeFalse();
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expect(isZeroNegative(parseFloat("-0"))).toBeTrue();
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expect(isZeroNegative(parseFloat(0))).toBeFalse();
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expect(isZeroNegative(parseFloat(+0))).toBeFalse();
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expect(isZeroNegative(parseFloat(-0))).toBeFalse();
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});
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test("parsing strings", () => {
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[
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["0", 0],
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["1", 1],
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[".23", 0.23],
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["1.23", 1.23],
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["0.0123E+2", 1.23],
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["1.23e4", 12300],
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["0x1.23p5", 0],
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["1.23p5", 1.23],
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["1.23e42351245", Infinity],
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["Infinity", Infinity],
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].forEach(test => {
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expect(parseFloat(test[0])).toBe(test[1]);
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expect(parseFloat(`+${test[0]}`)).toBe(test[1]);
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expect(parseFloat(`-${test[0]}`)).toBe(-test[1]);
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expect(parseFloat(`${test[0]}foo`)).toBe(test[1]);
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expect(parseFloat(`+${test[0]}foo`)).toBe(test[1]);
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expect(parseFloat(`-${test[0]}foo`)).toBe(-test[1]);
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expect(parseFloat(` \n \t ${test[0]} \v foo `)).toBe(test[1]);
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expect(parseFloat(` \r -${test[0]} \f \n\n foo `)).toBe(-test[1]);
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expect(parseFloat({ toString: () => test[0] })).toBe(test[1]);
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});
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});
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test("parsing NaN", () => {
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["", [], [], true, false, null, undefined, NaN, "foo123", "foo+123", "fooInfinity", "foo+Infinity"].forEach(
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value => {
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expect(parseFloat(value)).toBeNaN();
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}
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);
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expect(parseFloat()).toBeNaN();
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expect(parseFloat("", 123, Infinity)).toBeNaN();
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});
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