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describe("correct behavior", () => {
test("typeof bigint", () => {
expect(typeof 1n).toBe("bigint");
});
test("bigint string coersion", () => {
expect("" + 123n).toBe("123");
});
test("arithmetic operators", () => {
let bigint = 123n;
expect(-bigint).toBe(-123n);
expect(12n + 34n).toBe(46n);
expect(12n - 34n).toBe(-22n);
expect(8n * 12n).toBe(96n);
expect(123n / 10n).toBe(12n);
expect(2n ** 3n).toBe(8n);
expect(5n % 3n).toBe(2n);
expect(
45977665298704210987n +
(714320987142450987412098743217984576n / 4598741987421098765327980n) * 987498743n
).toBe(199365500239020623962n);
});
test("bitwise operators", () => {
expect(12n & 5n).toBe(4n);
expect(1n | 2n).toBe(3n);
expect(5n ^ 3n).toBe(6n);
expect(~1n).toBe(-2n);
});
test("increment operators", () => {
let bigint = 1n;
expect(bigint++).toBe(1n);
expect(bigint).toBe(2n);
expect(bigint--).toBe(2n);
expect(bigint).toBe(1n);
expect(++bigint).toBe(2n);
expect(bigint).toBe(2n);
expect(--bigint).toBe(1n);
expect(bigint).toBe(1n);
});
test("weak equality operators", () => {
expect(1n == 1n).toBeTrue();
expect(1n == 1).toBeTrue();
expect(1 == 1n).toBeTrue();
expect(1n == 1.23).toBeFalse();
expect(1.23 == 1n).toBeFalse();
expect(1n != 1n).toBeFalse();
expect(1n != 1).toBeFalse();
expect(1 != 1n).toBeFalse();
expect(1n != 1.23).toBeTrue();
expect(1.23 != 1n).toBeTrue();
});
test("strong equality operators", () => {
expect(1n === 1n).toBeTrue();
expect(1n === 1).toBeFalse();
expect(1 === 1n).toBeFalse();
expect(1n === 1.23).toBeFalse();
expect(1.23 === 1n).toBeFalse();
expect(1n !== 1n).toBeFalse();
expect(1n !== 1).toBeTrue();
expect(1 !== 1n).toBeTrue();
expect(1n !== 1.23).toBeTrue();
expect(1.23 !== 1n).toBeTrue();
});
});
describe("errors", () => {
test("conversion to number", () => {
expect(() => {
+123n;
}).toThrowWithMessage(TypeError, "Cannot convert BigInt to number");
});
});
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