56 lines
1.9 KiB
TypeScript
56 lines
1.9 KiB
TypeScript
import { describe, it, expect, expectTypeOf } from "vitest";
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import { withAnalytics, type Analyzed } from "@/with-analytics";
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import type { IAnalytics } from "@/analytics.interface";
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import { isAnalyzed } from "@repo/core-shared/conformance";
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function makeAnalytics(): IAnalytics {
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return {
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track: () => undefined,
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identify: () => undefined,
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pageView: () => undefined,
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flush: () => Promise.resolve(),
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};
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}
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describe("withAnalytics", () => {
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it("returns an Analyzed<F>", () => {
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const analytics = makeAnalytics();
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const fn = async (_input: { id: string }) => ({ ok: true });
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const wrapped = withAnalytics(analytics, fn);
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expectTypeOf(wrapped).toMatchTypeOf<Analyzed<typeof fn>>();
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});
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it("attaches __analyzed as a non-enumerable property on the wrapped function", () => {
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const analytics = makeAnalytics();
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const fn = async () => ({ ok: true });
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const wrapped = withAnalytics(analytics, fn);
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expect(isAnalyzed(wrapped)).toBe(true);
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expect(Object.keys(wrapped)).not.toContain("__analyzed");
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});
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it("does NOT pollute the original input function with the brand", () => {
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const analytics = makeAnalytics();
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const fn = async () => ({ ok: true });
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const wrapped = withAnalytics(analytics, fn);
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expect(isAnalyzed(fn)).toBe(false);
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expect(wrapped).not.toBe(fn);
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});
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it("passes input and output through unchanged", async () => {
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const analytics = makeAnalytics();
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const fn = async (input: { id: string }) => ({ ok: true, id: input.id });
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const wrapped = withAnalytics(analytics, fn);
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const result = await wrapped({ id: "abc" });
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expect(result).toEqual({ ok: true, id: "abc" });
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});
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it("propagates errors", async () => {
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const analytics = makeAnalytics();
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const err = new Error("boom");
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const wrapped = withAnalytics(analytics, async () => {
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throw err;
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});
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await expect(wrapped()).rejects.toBe(err);
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});
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});
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