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import { Queue } from "./queue";
describe("Queue", () => {
const calls: any[] = [];
const createJobFactory =
<T>(
// for purpose of this test, Error object will become a rejection value
resolutionOrRejectionValue: T,
ms = 1,
) =>
() => {
return new Promise<T>((resolve, reject) => {
setTimeout(() => {
if (resolutionOrRejectionValue instanceof Error) {
reject(resolutionOrRejectionValue);
} else {
resolve(resolutionOrRejectionValue);
}
}, ms);
}).then((x) => {
calls.push(x);
return x;
});
};
beforeEach(() => {
calls.length = 0;
});
it("should await and resolve values in order of enqueueing", async () => {
const queue = new Queue();
const p1 = queue.push(createJobFactory("A", 50));
const p2 = queue.push(createJobFactory("B"));
const p3 = queue.push(createJobFactory("C"));
expect(await p3).toBe("C");
expect(await p2).toBe("B");
expect(await p1).toBe("A");
expect(calls).toEqual(["A", "B", "C"]);
});
it("should reject a job if it throws, and not affect other jobs", async () => {
const queue = new Queue();
const err = new Error("B");
queue.push(createJobFactory("A", 50));
const p2 = queue.push(createJobFactory(err));
const p3 = queue.push(createJobFactory("C"));
const p2err = p2.catch((err) => err);
await p3;
expect(await p2err).toBe(err);
expect(calls).toEqual(["A", "C"]);
});
});
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