timpla/__tests__/lib/lazyImport.test.ts

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import * as internal from '../../gulpfile.ts/internal'
import { lazyImport } from '../../gulpfile.ts/lib/lazyImport'

jest.mock('../../gulpfile.ts/internal')

const sSureLazyImport = jest.spyOn(internal, 'sureLazyImport')
const sIsPackageInstalled = jest.spyOn(internal, 'isPackageInstalled')

describe('lazyImport', () => {
  it('should import the specified package if it exists', () => {
    sIsPackageInstalled.mockReturnValueOnce(true)
    sSureLazyImport.mockReturnValueOnce(true)
    const result = lazyImport('hello')
    expect(sSureLazyImport).toHaveBeenCalledWith('hello')
    expect(sIsPackageInstalled).toHaveBeenCalledWith('hello')
    expect(result).toBeTruthy()
  })
  it('should not import the specified package if it exists', () => {
    sIsPackageInstalled.mockReturnValueOnce(false)
    const result = lazyImport('hello')
    expect(result).toBeFalsy()
    expect(sSureLazyImport.mock.calls.length).toBe(0)
  })
})