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import { peek } from "bun";
import { expect, test } from "bun:test";
test("peek", () => {
const promise = Promise.resolve(true);
// no await necessary!
expect(peek(promise)).toBe(true);
// if we peek again, it returns the same value
const again = peek(promise);
expect(again).toBe(true);
// if we peek a non-promise, it returns the value
const value = peek(42);
expect(value).toBe(42);
// if we peek a pending promise, it returns the promise again
const pending = new Promise(() => {});
expect(peek(pending)).toBe(pending);
// If we peek a rejected promise, it:
// - returns the error
// - does not mark the promise as handled
const rejected = Promise.reject<Error>(
new Error("Succesfully tested promise rejection"),
);
const peeked = peek(rejected);
expect(peeked instanceof Error).toBe(true);
expect((peeked as Error).message).toBe(
"Succesfully tested promise rejection",
);
rejected.catch(() => {});
});
test("peek.status", () => {
const promise = Promise.resolve(true);
expect(peek.status(promise)).toBe("fulfilled");
const pending = new Promise(() => {});
expect(peek.status(pending)).toBe("pending");
const rejected = Promise.reject(new Error("oh nooo"));
expect(peek.status(rejected)).toBe("rejected");
rejected.catch(() => {});
});
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