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77 lines
2.1 KiB
JavaScript
77 lines
2.1 KiB
JavaScript
test("regular exponentiation", () => {
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expect(2 ** 0).toBe(1);
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expect(2 ** 1).toBe(2);
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expect(2 ** 2).toBe(4);
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expect(2 ** 3).toBe(8);
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expect(3 ** 2).toBe(9);
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expect(0 ** 0).toBe(1);
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expect(2 ** (3 ** 2)).toBe(512);
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expect(2 ** (3 ** 2)).toBe(512);
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expect((2 ** 3) ** 2).toBe(64);
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});
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test("exponentiation with negatives", () => {
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expect(2 ** -3).toBe(0.125);
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expect((-2) ** 3).toBe(-8);
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expect("-2 ** 3").not.toEval();
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});
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test("exponentiation with PlusPlus and MinusMinus", () => {
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let value = 5;
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// prettier-ignore
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expect(++value ** 2).toBe(36);
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value = 5;
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expect((++value) ** 2).toBe(36);
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value = 5;
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// prettier-ignore
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expect(--value ** 2).toBe(16);
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value = 5;
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expect((--value) ** 2).toBe(16);
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expect("++5 ** 2").not.toEval();
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expect("--5 ** 2").not.toEval();
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});
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test("exponentiation with non-numeric primitives", () => {
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expect("2" ** "3").toBe(8);
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expect("" ** []).toBe(1);
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expect([] ** null).toBe(1);
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expect(null ** null).toBe(1);
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expect(undefined ** null).toBe(1);
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});
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test("exponentiation that produces NaN", () => {
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expect(NaN ** 2).toBeNaN();
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expect(2 ** NaN).toBeNaN();
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expect(undefined ** 2).toBeNaN();
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expect(2 ** undefined).toBeNaN();
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expect(null ** undefined).toBeNaN();
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expect(2 ** "foo").toBeNaN();
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expect("foo" ** 2).toBeNaN();
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});
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test("exponentiation with infinities", () => {
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expect((-1) ** Infinity).toBeNaN();
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expect(0 ** Infinity).toBe(0);
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expect(1 ** Infinity).toBeNaN();
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expect((-1) ** -Infinity).toBeNaN();
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expect(0 ** -Infinity).toBe(Infinity);
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expect(1 ** -Infinity).toBeNaN();
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expect(Infinity ** -1).toBe(0);
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expect(Infinity ** 0).toBe(1);
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expect(Infinity ** 1).toBe(Infinity);
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expect((-Infinity) ** -1).toBe(-0);
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expect((-Infinity) ** 0).toBe(1);
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expect((-Infinity) ** 1).toBe(-Infinity);
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});
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test("unary expression before exponentiation with brackets", () => {
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expect((!1) ** 2).toBe(0);
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expect((~5) ** 2).toBe(36);
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expect((+5) ** 2).toBe(25);
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expect((-5) ** 2).toBe(25);
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});
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