26 lines
801 B
JavaScript
26 lines
801 B
JavaScript
test("length is 1", () => {
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expect(isNaN).toHaveLength(1);
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});
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test("arguments that evaluate to false", () => {
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expect(isNaN(0)).toBeFalse();
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expect(isNaN(42)).toBeFalse();
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expect(isNaN("")).toBeFalse();
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expect(isNaN("0")).toBeFalse();
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expect(isNaN("42")).toBeFalse();
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expect(isNaN(true)).toBeFalse();
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expect(isNaN(false)).toBeFalse();
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expect(isNaN(null)).toBeFalse();
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expect(isNaN([])).toBeFalse();
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expect(isNaN(Infinity)).toBeFalse();
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expect(isNaN(-Infinity)).toBeFalse();
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});
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test("arguments that evaluate to true", () => {
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expect(isNaN()).toBeTrue();
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expect(isNaN(NaN)).toBeTrue();
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expect(isNaN(undefined)).toBeTrue();
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expect(isNaN("foo")).toBeTrue();
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expect(isNaN({})).toBeTrue();
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expect(isNaN([1, 2, 3])).toBeTrue();
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});
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