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index.test.js
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const { JSDOM } = require("jsdom");
const dom = new JSDOM(`<!DOCTYPE html><p>Hello world</p>`);
const originalDocument = { ...document.documentElement }
const docSpy = jest.spyOn(document, 'documentElement', 'get')
const { addResizeListener, removeResizeListener } = require('./index');
const waitRAF = () => new Promise(resolve => requestAnimationFrame(resolve))
describe('When addResizeListener adds a callback for content resize', () => {
const mockCallback = jest.fn()
beforeAll(() => {
addResizeListener(mockCallback)
})
it('it should fire on content resize', async () => {
docSpy.mockImplementation(() => ({
...originalDocument,
scrollWidth: 1000
}))
await waitRAF();
expect(mockCallback).toHaveBeenCalled()
})
it('it shouldn\'t fire twice for a single content resize', async () => {
await waitRAF();
expect(mockCallback).toHaveBeenCalledTimes(1)
})
it('it should fire on subsequent content resize', async () => {
docSpy.mockImplementation(() => ({
...originalDocument,
scrollWidth: 500
}))
await waitRAF();
expect(mockCallback).toHaveBeenCalledTimes(2)
})
it('it should fire on different dimension content resize', async () => {
docSpy.mockImplementation(() => ({
...originalDocument,
scrollHeight: 1000
}))
await waitRAF();
expect(mockCallback).toHaveBeenCalledTimes(3)
})
afterAll(() => {
removeResizeListener(mockCallback)
jest.clearAllMocks();
})
})
describe('When addResizeListener adds a callback for client resize', () => {
const mockCallback = jest.fn()
beforeAll(() => {
addResizeListener(mockCallback)
})
it('it should fire on screen resize', async () => {
docSpy.mockImplementation(() => ({
...originalDocument,
clientWidth: 1000
}))
await waitRAF();
expect(mockCallback).toHaveBeenCalled()
})
it('it shouldn\'t fire twice for a single screen resize', async () => {
await waitRAF();
expect(mockCallback).toHaveBeenCalledTimes(1)
})
it('it should fire on subsequent screen resize', async () => {
docSpy.mockImplementation(() => ({
...originalDocument,
clientWidth: 500
}))
await waitRAF();
expect(mockCallback).toHaveBeenCalledTimes(2)
})
it('it should fire on different dimension screen resize', async () => {
docSpy.mockImplementation(() => ({
...originalDocument,
clientHeight: 1000
}))
await waitRAF();
expect(mockCallback).toHaveBeenCalledTimes(3)
})
afterAll(() => {
removeResizeListener(mockCallback)
jest.clearAllMocks();
})
})
describe('When removeResizeListener removes a callback', () => {
const mockCallback = jest.fn()
beforeAll(() => {
addResizeListener(mockCallback)
removeResizeListener(mockCallback)
})
it('it shouldn\'t fire on resize', async () => {
docSpy.mockImplementation(() => ({
...originalDocument,
clientWidth: 500
}))
await waitRAF();
expect(mockCallback).toHaveBeenCalledTimes(0)
})
afterAll(() => {
jest.clearAllMocks();
})
})
describe('When a callback throws an error with breakOnError', () => {
const mockCallback = jest.fn().mockImplementation(() => {
throw new Error('Test Error')
})
beforeAll(() => {
addResizeListener(mockCallback, true)
})
it('it should not error on screen resize', async () => {
docSpy.mockImplementation(() => ({
...originalDocument,
clientWidth: 1000
}))
await waitRAF();
expect(mockCallback).toHaveBeenCalledTimes(1)
})
it('it should not be called a second time on screen resize', async () => {
docSpy.mockImplementation(() => ({
...originalDocument,
clientWidth: 500
}))
await waitRAF();
expect(mockCallback).toHaveBeenCalledTimes(1)
})
afterAll(() => {
removeResizeListener(mockCallback)
jest.clearAllMocks();
})
})