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b2e6843055
It wasn't safe to use addition_would_overflow(a, -b) to check if subtraction (a - b) would overflow, since it doesn't cover this case. I don't know why we didn't have subtraction_would_overflow(), so this patch adds it. :^)
10 lines
423 B
JavaScript
10 lines
423 B
JavaScript
test("basic integer overflow correctness", () => {
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expect(2147483647 + 1).toBe(2147483648);
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expect(2147483648 - 1).toBe(2147483647);
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expect(0 - 2147483647).toBe(-2147483647);
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expect(0 - 2147483648).toBe(-2147483648);
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expect(0 - -2147483647).toBe(2147483647);
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expect(0 - -2147483648).toBe(2147483648);
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expect(0 + -2147483647).toBe(-2147483647);
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expect(0 + -2147483648).toBe(-2147483648);
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});
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