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LibJS: Implement BigInt.asIntN
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commit
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2 changed files with 105 additions and 4 deletions
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describe("errors", () => {
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test("invalid index", () => {
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expect(() => {
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BigInt.asIntN(-1, 0n);
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}).toThrowWithMessage(RangeError, "Index must be a positive integer");
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expect(() => {
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BigInt.asIntN(Symbol(), 0n);
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}).toThrowWithMessage(TypeError, "Cannot convert symbol to number");
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});
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test("invalid BigInt", () => {
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expect(() => {
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BigInt.asIntN(1, 1);
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}).toThrowWithMessage(TypeError, "Cannot convert number to BigInt");
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expect(() => {
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BigInt.asIntN(1, Symbol());
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}).toThrowWithMessage(TypeError, "Cannot convert symbol to BigInt");
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expect(() => {
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BigInt.asIntN(1, "foo");
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}).toThrowWithMessage(SyntaxError, "Invalid value for BigInt: foo");
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});
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});
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describe("correct behavior", () => {
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test("length is 2", () => {
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expect(BigInt.asIntN).toHaveLength(2);
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});
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test("basic functionality", () => {
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expect(BigInt.asIntN(0, -2n)).toBe(0n);
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expect(BigInt.asIntN(0, -1n)).toBe(0n);
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expect(BigInt.asIntN(0, 0n)).toBe(0n);
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expect(BigInt.asIntN(0, 1n)).toBe(0n);
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expect(BigInt.asIntN(0, 2n)).toBe(0n);
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expect(BigInt.asIntN(1, -3n)).toBe(-1n);
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expect(BigInt.asIntN(1, -2n)).toBe(0n);
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expect(BigInt.asIntN(1, -1n)).toBe(-1n);
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expect(BigInt.asIntN(1, 0n)).toBe(0n);
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expect(BigInt.asIntN(1, 1n)).toBe(-1n);
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expect(BigInt.asIntN(1, 2n)).toBe(0n);
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expect(BigInt.asIntN(1, 3n)).toBe(-1n);
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expect(BigInt.asIntN(2, -3n)).toBe(1n);
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expect(BigInt.asIntN(2, -2n)).toBe(-2n);
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expect(BigInt.asIntN(2, -1n)).toBe(-1n);
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expect(BigInt.asIntN(2, 0n)).toBe(0n);
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expect(BigInt.asIntN(2, 1n)).toBe(1n);
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expect(BigInt.asIntN(2, 2n)).toBe(-2n);
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expect(BigInt.asIntN(2, 3n)).toBe(-1n);
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expect(BigInt.asIntN(4, -3n)).toBe(-3n);
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expect(BigInt.asIntN(4, -2n)).toBe(-2n);
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expect(BigInt.asIntN(4, -1n)).toBe(-1n);
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expect(BigInt.asIntN(4, 0n)).toBe(0n);
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expect(BigInt.asIntN(4, 1n)).toBe(1n);
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expect(BigInt.asIntN(4, 2n)).toBe(2n);
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expect(BigInt.asIntN(4, 3n)).toBe(3n);
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const extremelyBigInt = 123456789123456789123456789123456789123456789123456789n;
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expect(BigInt.asIntN(0, extremelyBigInt)).toBe(0n);
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expect(BigInt.asIntN(1, extremelyBigInt)).toBe(-1n);
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expect(BigInt.asIntN(2, extremelyBigInt)).toBe(1n);
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expect(BigInt.asIntN(4, extremelyBigInt)).toBe(5n);
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expect(BigInt.asIntN(128, extremelyBigInt)).toBe(-99061374399389259395070030194384019691n);
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expect(BigInt.asIntN(256, extremelyBigInt)).toBe(extremelyBigInt);
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expect(BigInt.asIntN(0, -extremelyBigInt)).toBe(0n);
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expect(BigInt.asIntN(1, -extremelyBigInt)).toBe(-1n);
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expect(BigInt.asIntN(2, -extremelyBigInt)).toBe(-1n);
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expect(BigInt.asIntN(4, -extremelyBigInt)).toBe(-5n);
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expect(BigInt.asIntN(128, -extremelyBigInt)).toBe(99061374399389259395070030194384019691n);
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expect(BigInt.asIntN(256, -extremelyBigInt)).toBe(-extremelyBigInt);
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});
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});
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