mirror of
https://github.com/RGBCube/serenity
synced 2025-10-30 17:42:45 +00:00
e663504df1
For negative number this previously rounded towards zero instead of the intended always rounding down.
76 lines
2 KiB
JavaScript
76 lines
2 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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expect(0xffffffff >> 0).toBe(-1);
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expect(0xffffffff >> 16).toBe(-1);
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expect((0xf0000000 * 2) >> 16).toBe(-8192);
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});
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test("numeric shifting with negative lhs values", () => {
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expect(-1 >> 0).toBe(-1);
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expect(-1 >> 1).toBe(-1);
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expect(-1 >> 2).toBe(-1);
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expect(-1 >> 3).toBe(-1);
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expect(-1 >> 4).toBe(-1);
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expect(-1 >> 5).toBe(-1);
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expect(-5 >> 0).toBe(-5);
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expect(-5 >> 1).toBe(-3);
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expect(-5 >> 2).toBe(-2);
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expect(-5 >> 3).toBe(-1);
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expect(-5 >> 4).toBe(-1);
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expect(-5 >> 5).toBe(-1);
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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(5);
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expect(x >> y).toBe(4);
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expect(x >> [[[[5]]]]).toBe(2);
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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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describe("logical right shift on big ints", () => {
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expect(3n >> 1n).toBe(1n);
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expect(3n >> 2n).toBe(0n);
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expect(-3n >> 1n).toBe(-2n);
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expect(-3n >> 2n).toBe(-1n);
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expect(-3n >> 128n).toBe(-1n);
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expect(-3n >> -6n).toBe(-192n);
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expect(-3n >> 0n).toBe(-3n);
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});
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