62 lines
1.7 KiB
JavaScript
62 lines
1.7 KiB
JavaScript
test("basic numeric shifting", () => {
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expect(0 >>> 0).toBe(0);
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expect(0 >>> 1).toBe(0);
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expect(0 >>> 2).toBe(0);
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expect(0 >>> 3).toBe(0);
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expect(0 >>> 4).toBe(0);
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expect(0 >>> 5).toBe(0);
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expect(1 >>> 0).toBe(1);
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expect(1 >>> 1).toBe(0);
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expect(1 >>> 2).toBe(0);
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expect(1 >>> 3).toBe(0);
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expect(1 >>> 4).toBe(0);
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expect(1 >>> 5).toBe(0);
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expect(5 >>> 0).toBe(5);
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expect(5 >>> 1).toBe(2);
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expect(5 >>> 2).toBe(1);
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expect(5 >>> 3).toBe(0);
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expect(5 >>> 4).toBe(0);
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expect(5 >>> 5).toBe(0);
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expect(42 >>> 0).toBe(42);
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expect(42 >>> 1).toBe(21);
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expect(42 >>> 2).toBe(10);
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expect(42 >>> 3).toBe(5);
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expect(42 >>> 4).toBe(2);
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expect(42 >>> 5).toBe(1);
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});
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test("numeric shifting with negative lhs values", () => {
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expect(-1 >>> 0).toBe(4294967295);
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expect(-1 >>> 1).toBe(2147483647);
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expect(-1 >>> 2).toBe(1073741823);
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expect(-1 >>> 3).toBe(536870911);
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expect(-1 >>> 4).toBe(268435455);
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expect(-1 >>> 5).toBe(134217727);
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expect(-5 >>> 0).toBe(4294967291);
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expect(-5 >>> 1).toBe(2147483645);
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expect(-5 >>> 2).toBe(1073741822);
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expect(-5 >>> 3).toBe(536870911);
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expect(-5 >>> 4).toBe(268435455);
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expect(-5 >>> 5).toBe(134217727);
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});
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test("shifting with non-numeric values", () => {
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let x = -67;
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let y = 4;
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expect("-42" >>> 3).toBe(536870906);
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expect(x >>> y).toBe(268435451);
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expect(x >>> [[[[5]]]]).toBe(134217725);
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expect(undefined >>> y).toBe(0);
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expect("a" >>> "b").toBe(0);
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expect(null >>> null).toBe(0);
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expect(undefined >>> undefined).toBe(0);
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expect(NaN >>> NaN).toBe(0);
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expect(6 >>> NaN).toBe(6);
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expect(Infinity >>> Infinity).toBe(0);
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expect(-Infinity >>> Infinity).toBe(0);
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});
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