53 lines
1.7 KiB
TypeScript
53 lines
1.7 KiB
TypeScript
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import { Emitter } from "../src/common/emitter"
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describe("emitter", () => {
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describe("Emitter", () => {
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it("should return an Emitter", async () => {
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const HELLO_WORLD = "HELLO_WORLD"
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const GOODBYE_WORLD = "GOODBYE_WORLD"
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const mockCallback = jest.fn(() => "Mock function called")
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const mockSecondCallback = jest.fn(() => undefined)
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const emitter = new Emitter<{ event: string; callback: () => void }>()
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const onHelloWorld = ({ event, callback }: { event: string; callback: () => void }): void => {
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if (event === HELLO_WORLD) {
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callback()
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}
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}
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const onGoodbyeWorld = ({ event, callback }: { event: string; callback: () => void }): void => {
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if (event === GOODBYE_WORLD) {
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callback()
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}
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}
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// Register the onHelloWorld listener
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// and the onGoodbyeWorld
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emitter.event(onHelloWorld)
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emitter.event(onGoodbyeWorld)
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await emitter.emit({ event: HELLO_WORLD, callback: mockCallback })
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// Double-check that our callback is called only once
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expect(mockCallback).toHaveBeenCalled()
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expect(mockCallback).toHaveBeenCalledTimes(1)
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await emitter.emit({ event: GOODBYE_WORLD, callback: mockSecondCallback })
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// Check that it works with multiple listeners
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expect(mockSecondCallback).toHaveBeenCalled()
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expect(mockSecondCallback).toHaveBeenCalledTimes(1)
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// Dispose of all the listeners
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emitter.dispose()
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})
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it.skip("should log an error if something goes wrong", () => {
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// not sure how we're going to test this
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// need to mock logger
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// and then somehow throw or something in the callback
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})
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})
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})
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