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