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refactor: convert observables to events (@miodec) #7680
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,46 +1,81 @@ | ||
| import { createRoot } from "solid-js"; | ||
| import { describe, expect, it } from "vitest"; | ||
| import { describe, expect, it, vi } from "vitest"; | ||
| import { createEvent } from "../../src/ts/hooks/createEvent"; | ||
|
|
||
| describe("createEvent", () => { | ||
| it("initial value is 0", () => { | ||
| createRoot((dispose) => { | ||
| const [event] = createEvent(); | ||
| expect(event()).toBe(0); | ||
| dispose(); | ||
| }); | ||
| it("dispatch notifies subscribers", () => { | ||
| const event = createEvent<string>(); | ||
| const fn = vi.fn(); | ||
| event.subscribe(fn); | ||
| event.dispatch("hello"); | ||
| expect(fn).toHaveBeenCalledWith("hello"); | ||
| }); | ||
|
|
||
| it("dispatch increments the value by 1", () => { | ||
| createRoot((dispose) => { | ||
| const [event, dispatch] = createEvent(); | ||
| dispatch(); | ||
| expect(event()).toBe(1); | ||
| dispose(); | ||
| }); | ||
| it("dispatch notifies multiple subscribers", () => { | ||
| const event = createEvent<number>(); | ||
| const fn1 = vi.fn(); | ||
| const fn2 = vi.fn(); | ||
| event.subscribe(fn1); | ||
| event.subscribe(fn2); | ||
| event.dispatch(42); | ||
| expect(fn1).toHaveBeenCalledWith(42); | ||
| expect(fn2).toHaveBeenCalledWith(42); | ||
| }); | ||
|
|
||
| it("each dispatch increments independently", () => { | ||
| createRoot((dispose) => { | ||
| const [event, dispatch] = createEvent(); | ||
| dispatch(); | ||
| dispatch(); | ||
| dispatch(); | ||
| expect(event()).toBe(3); | ||
| dispose(); | ||
| }); | ||
| it("dispatch with no type arg requires no arguments", () => { | ||
| const event = createEvent(); | ||
| const fn = vi.fn(); | ||
| event.subscribe(fn); | ||
| event.dispatch(); | ||
| expect(fn).toHaveBeenCalledTimes(1); | ||
| }); | ||
|
|
||
| it("subscribe returns an unsubscribe function", () => { | ||
| const event = createEvent<string>(); | ||
| const fn = vi.fn(); | ||
| const unsub = event.subscribe(fn); | ||
| event.dispatch("a"); | ||
| unsub(); | ||
| event.dispatch("b"); | ||
| expect(fn).toHaveBeenCalledTimes(1); | ||
| expect(fn).toHaveBeenCalledWith("a"); | ||
| }); | ||
|
|
||
| it("two independent events do not share state", () => { | ||
| const eventA = createEvent<string>(); | ||
| const eventB = createEvent<string>(); | ||
| const fnA = vi.fn(); | ||
| const fnB = vi.fn(); | ||
| eventA.subscribe(fnA); | ||
| eventB.subscribe(fnB); | ||
| eventA.dispatch("a"); | ||
| expect(fnA).toHaveBeenCalledWith("a"); | ||
| expect(fnB).not.toHaveBeenCalled(); | ||
| }); | ||
|
|
||
| it("useListener auto-unsubscribes on dispose", () => { | ||
| const event = createEvent<string>(); | ||
| const fn = vi.fn(); | ||
| createRoot((dispose) => { | ||
| const [eventA, dispatchA] = createEvent(); | ||
| const [eventB, dispatchB] = createEvent(); | ||
| dispatchA(); | ||
| dispatchA(); | ||
| dispatchB(); | ||
| expect(eventA()).toBe(2); | ||
| expect(eventB()).toBe(1); | ||
| event.useListener(fn); | ||
| event.dispatch("inside"); | ||
| dispose(); | ||
| }); | ||
| event.dispatch("outside"); | ||
| expect(fn).toHaveBeenCalledTimes(1); | ||
| expect(fn).toHaveBeenCalledWith("inside"); | ||
| }); | ||
|
|
||
| it("subscriber errors do not prevent other subscribers from running", () => { | ||
| const event = createEvent<string>(); | ||
| const fn1 = vi.fn(() => { | ||
| throw new Error("oops"); | ||
| }); | ||
| const fn2 = vi.fn(); | ||
| event.subscribe(fn1); | ||
| event.subscribe(fn2); | ||
| event.dispatch("test"); | ||
| expect(fn1).toHaveBeenCalled(); | ||
| expect(fn2).toHaveBeenCalled(); | ||
| }); | ||
| }); |
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