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TypeScript
at icy/tmrrpn
12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758import { describe, expect, it } from "vitest";import { createAction } from "./action.svelte";
describe("createAction", () => { it("derives ergonomic projections from one state", async () => { let resolve!: (value: string) => void; const action = createAction(() => new Promise<string>((done) => (resolve = done)));
expect(action.loading).toBe(false); expect(action.data).toBeUndefined(); expect(action.error).toBeUndefined();
const running = action.run(); expect(action.loading).toBe(true);
resolve("done"); await running; expect(action.data).toBe("done"); });
it("converts failures", async () => { const action = createAction( async () => { throw new Error("nope"); }, (cause) => (cause instanceof Error ? cause.message : "unknown") );
await action.run(); expect(action.error).toBe("nope"); });
it("ignores an older result after a newer run starts", async () => { const resolvers: Array<(value: string) => void> = []; const names: string[] = []; const action = createAction( (name: string) => new Promise<string>((resolve) => { names.push(name); resolvers.push(resolve); }) ); const first = action.run("first"); const second = action.run("second"); expect(names).toEqual(["first", "second"]); expect(action.args).toEqual(["second"]);
resolvers[0]("stale"); await first; expect(action.loading).toBe(true);
resolvers[1]("current"); await second; expect(action.data).toBe("current"); expect(action.args).toBeUndefined(); });});