105 lines
3.1 KiB
JavaScript
105 lines
3.1 KiB
JavaScript
describe("correct behavior", () => {
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test("typeof bigint", () => {
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expect(typeof 1n).toBe("bigint");
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});
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test("bigint string coercion", () => {
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expect("" + 123n).toBe("123");
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});
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test("arithmetic operators", () => {
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let bigint = 123n;
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expect(-bigint).toBe(-123n);
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expect(12n + 34n).toBe(46n);
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expect(12n - 34n).toBe(-22n);
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expect(8n * 12n).toBe(96n);
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expect(123n / 10n).toBe(12n);
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expect(2n ** 3n).toBe(8n);
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expect(5n % 3n).toBe(2n);
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expect(
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45977665298704210987n +
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(714320987142450987412098743217984576n / 4598741987421098765327980n) * 987498743n
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).toBe(199365500239020623962n);
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});
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test("bitwise operators", () => {
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expect(12n & 5n).toBe(4n);
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expect(1n | 2n).toBe(3n);
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expect(5n ^ 3n).toBe(6n);
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expect(~1n).toBe(-2n);
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});
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test("increment operators", () => {
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let bigint = 1n;
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expect(bigint++).toBe(1n);
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expect(bigint).toBe(2n);
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expect(bigint--).toBe(2n);
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expect(bigint).toBe(1n);
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expect(++bigint).toBe(2n);
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expect(bigint).toBe(2n);
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expect(--bigint).toBe(1n);
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expect(bigint).toBe(1n);
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});
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test("weak equality operators", () => {
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expect(1n == 1n).toBeTrue();
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expect(1n == 1).toBeTrue();
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expect(1 == 1n).toBeTrue();
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expect(1n == 1.23).toBeFalse();
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expect(1.23 == 1n).toBeFalse();
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expect(1n != 1n).toBeFalse();
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expect(1n != 1).toBeFalse();
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expect(1 != 1n).toBeFalse();
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expect(1n != 1.23).toBeTrue();
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expect(1.23 != 1n).toBeTrue();
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const a = 552141064586571465517761649840658n;
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const b = 704179908449526267977309288010258n;
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expect(a == a).toBeTrue();
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expect(a == b).toBeFalse();
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});
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test("strong equality operators", () => {
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expect(1n === 1n).toBeTrue();
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expect(1n === 1).toBeFalse();
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expect(1 === 1n).toBeFalse();
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expect(1n === 1.23).toBeFalse();
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expect(1.23 === 1n).toBeFalse();
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expect(1n !== 1n).toBeFalse();
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expect(1n !== 1).toBeTrue();
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expect(1 !== 1n).toBeTrue();
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expect(1n !== 1.23).toBeTrue();
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expect(1.23 !== 1n).toBeTrue();
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const a = 552141064586571465517761649840658n;
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const b = 704179908449526267977309288010258n;
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expect(a === a).toBeTrue();
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expect(a === b).toBeFalse();
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});
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});
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describe("errors", () => {
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test("conversion to number", () => {
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expect(() => {
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+123n;
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}).toThrowWithMessage(TypeError, "Cannot convert BigInt to number");
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});
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test("division by zero", () => {
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expect(() => {
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1n / 0n;
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}).toThrowWithMessage(RangeError, "Division by zero");
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expect(() => {
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1n % 0n;
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}).toThrowWithMessage(RangeError, "Division by zero");
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});
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test("negative exponent", () => {
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expect(() => {
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1n ** -1n;
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}).toThrowWithMessage(RangeError, "Exponent must be positive");
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});
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});
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