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import { expect, it } from "bun:test";
it("performance.now() should be monotonic", () => {
const first = performance.now();
const second = performance.now();
const third = performance.now();
const fourth = performance.now();
const fifth = performance.now();
const sixth = performance.now();
expect(first < second).toBe(true);
expect(second < third).toBe(true);
expect(third < fourth).toBe(true);
expect(fourth < fifth).toBe(true);
expect(fifth < sixth).toBe(true);
expect(Bun.nanoseconds() > 0).toBe(true);
expect(Bun.nanoseconds() > sixth).toBe(true);
expect(typeof Bun.nanoseconds() === "number").toBe(true);
});
it("performance.timeOrigin + performance.now() should be similar to Date.now()", () => {
expect(Math.abs(performance.timeOrigin + performance.now() - Date.now()) < 1000).toBe(true);
});
// https://github.com/oven-sh/bun/issues/5604
it("performance.now() DOMJIT", () => {
// This test is very finnicky.
// It has to return true || return false to reproduce. Throwing an error doesn't work.
function run(start, prev) {
while (true) {
const current = performance.now();
if (Number.isNaN(current) || current < prev) {
return false;
}
if (current - start > 200) {
return true;
}
prev = current;
}
}
const start = performance.now();
if (!run(start, start)) {
throw new Error("performance.now() is not monotonic");
}
});
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