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HTML5Backend.spec.ts
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HTML5Backend.spec.ts
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import type { DragDropManager } from 'dnd-core'
import type { HTML5BackendImpl } from '../HTML5BackendImpl.js'
import { HTML5Backend } from '../index.js'
declare const global: any
describe('The HTML5 Backend', () => {
describe('window injection', () => {
it('uses an undefined window when no window is available', () => {
const mockWindow = global.window
try {
delete global.window
const backend = HTML5Backend(mockManager()) as HTML5BackendImpl
expect(backend).toBeDefined()
expect(backend.window).toBeUndefined()
} finally {
global.window = mockWindow
}
})
it('can generate a profiling object', () => {
const backend = HTML5Backend(mockManager()) as HTML5BackendImpl
expect(backend).toBeDefined()
// Expect an initially empty profile
const profile = backend.profile()
expect(profile).toBeDefined()
Object.keys(profile).forEach((profilingKey) =>
expect(profile[profilingKey]).toEqual(0),
)
})
it('uses the ambient window global', () => {
const backend = HTML5Backend(mockManager(), window) as HTML5BackendImpl
expect(backend).toBeDefined()
expect(backend.window).toBeDefined()
})
it('allows a window to be injected', () => {
const fakeWindow = {
x: 1,
}
const backend = HTML5Backend(
mockManager(),
fakeWindow,
) as HTML5BackendImpl
expect(backend).toBeDefined()
expect(backend.window).toBe(fakeWindow)
})
})
describe('setup and teardown', () => {
let backend: HTML5BackendImpl
let mgr: DragDropManager
let fakeWindow: any = {}
beforeEach(() => {
mgr = mockManager()
})
afterEach(() => {
fakeWindow = {}
})
it('should throw error if two instances of html5 backend are setup', () => {
backend = HTML5Backend(mgr, {
window: fakeWindow,
}) as HTML5BackendImpl
backend.setup()
try {
backend.setup()
} catch (e: any) {
expect(e.message).toEqual(
'Cannot have two HTML5 backends at the same time.',
)
}
})
it('should set __isReactDndBackendSetUp on setup', () => {
backend = HTML5Backend(mgr, fakeWindow) as HTML5BackendImpl
backend.setup()
expect(fakeWindow.__isReactDndBackendSetUp).toBeTruthy()
})
it('should unset ____isReactDndBackendSetUp on teardown', () => {
backend = HTML5Backend(mgr, fakeWindow) as HTML5BackendImpl
backend.setup()
backend.teardown()
expect(fakeWindow.__isReactDndBackendSetUp).toBeFalsy()
})
it('should be able to call setup after teardown', () => {
backend = HTML5Backend(mgr, fakeWindow) as HTML5BackendImpl
backend.setup()
backend.teardown()
backend.setup()
expect(fakeWindow.__isReactDndBackendSetUp).toBeTruthy()
})
})
})
function mockManager(): DragDropManager {
return {
getActions: () => null,
getMonitor: () => null,
getRegistry: () => null,
} as any
}