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| 1 | +// Note: we need to import logger from the root |
| 2 | +// because this is the logger used in logError in ../src/common/util |
| 3 | +import { logger } from "../node_modules/@coder/logger" |
| 4 | +import { Emitter } from "../src/common/emitter" |
| 5 | + |
| 6 | +describe("Emitter", () => { |
| 7 | + let spy: jest.SpyInstance |
| 8 | + |
| 9 | + beforeEach(() => { |
| 10 | + spy = jest.spyOn(logger, "error") |
| 11 | + }) |
| 12 | + |
| 13 | + afterEach(() => { |
| 14 | + jest.clearAllMocks() |
| 15 | + }) |
| 16 | + |
| 17 | + afterAll(() => { |
| 18 | + jest.restoreAllMocks() |
| 19 | + }) |
| 20 | + |
| 21 | + it("should run the correct callbacks", async () => { |
| 22 | + const HELLO_WORLD = "HELLO_WORLD" |
| 23 | + const GOODBYE_WORLD = "GOODBYE_WORLD" |
| 24 | + const mockCallback = jest.fn(() => "Mock function called") |
| 25 | + const mockSecondCallback = jest.fn(() => undefined) |
| 26 | + |
| 27 | + const emitter = new Emitter<{ event: string; callback: () => void }>() |
| 28 | + |
| 29 | + const onHelloWorld = ({ event, callback }: { event: string; callback: () => void }): void => { |
| 30 | + if (event === HELLO_WORLD) { |
| 31 | + callback() |
| 32 | + } |
| 33 | + } |
| 34 | + |
| 35 | + const onGoodbyeWorld = ({ event, callback }: { event: string; callback: () => void }): void => { |
| 36 | + if (event === GOODBYE_WORLD) { |
| 37 | + callback() |
| 38 | + } |
| 39 | + } |
| 40 | + |
| 41 | + // Register the onHelloWorld listener |
| 42 | + // and the onGoodbyeWorld |
| 43 | + emitter.event(onHelloWorld) |
| 44 | + emitter.event(onGoodbyeWorld) |
| 45 | + |
| 46 | + await emitter.emit({ event: HELLO_WORLD, callback: mockCallback }) |
| 47 | + |
| 48 | + // Double-check that our callback is called only once |
| 49 | + expect(mockCallback).toHaveBeenCalled() |
| 50 | + expect(mockCallback).toHaveBeenCalledTimes(1) |
| 51 | + |
| 52 | + await emitter.emit({ event: GOODBYE_WORLD, callback: mockSecondCallback }) |
| 53 | + |
| 54 | + // Check that it works with multiple listeners |
| 55 | + expect(mockSecondCallback).toHaveBeenCalled() |
| 56 | + expect(mockSecondCallback).toHaveBeenCalledTimes(1) |
| 57 | + |
| 58 | + // Dispose of all the listeners |
| 59 | + emitter.dispose() |
| 60 | + }) |
| 61 | + |
| 62 | + it("should log an error if something goes wrong", async () => { |
| 63 | + const HELLO_WORLD = "HELLO_WORLD" |
| 64 | + const mockCallback = jest.fn(() => "Mock function called") |
| 65 | + const message = "You don't have access to that folder." |
| 66 | + |
| 67 | + const emitter = new Emitter<{ event: string; callback: () => void }>() |
| 68 | + |
| 69 | + const onHelloWorld = ({ event, callback }: { event: string; callback: () => void }): void => { |
| 70 | + if (event === HELLO_WORLD) { |
| 71 | + callback() |
| 72 | + throw new Error(message) |
| 73 | + } |
| 74 | + } |
| 75 | + |
| 76 | + emitter.event(onHelloWorld) |
| 77 | + |
| 78 | + await emitter.emit({ event: HELLO_WORLD, callback: mockCallback }) |
| 79 | + |
| 80 | + // Check that error was called |
| 81 | + expect(spy).toHaveBeenCalled() |
| 82 | + expect(spy).toHaveBeenCalledTimes(1) |
| 83 | + expect(spy).toHaveBeenCalledWith(message) |
| 84 | + }) |
| 85 | +}) |
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