feat: add setup API (#746)

src/__tests__/setup.ts

@@ -0,0 +1,273 @@
+import userEvent from 'index'
+import cases from 'jest-in-case'
+import {UserEventApis} from '../setup'
+import {setup} from './helpers/utils'
+
+/// start of mocking
+
+// The following hacky mocking allows us to spy on imported API functions.
+// The API imports are replaced with a mock with the real API as implementation.
+// This way we can run the real APIs here and without repeating tests of each API implementation,
+// we still can test assertions on the wiring of arguments.
+
+// Disable eslint rules that are not worth it here as they heavily reduce readability
+/* eslint-disable @typescript-eslint/no-unsafe-member-access */
+/* eslint-disable import/order */
+
+// List of API modules imported by `setup`
+import '../clear'
+import '../click'
+import '../hover'
+import '../keyboard'
+import '../paste'
+import '../select-options'
+import '../tab'
+import '../type'
+import '../upload'
+
+// `const` are not initialized when mocking is executed, but `function` are when prefixed with `mock`
+function mockSpies() {}
+type mockSpiesEntry<T extends keyof UserEventApis = keyof UserEventApis> = {
+  mock: jest.Mock<UserEventApis[T]>
+  real: UserEventApis[T]
+}
+
+// access the `function` as object
+interface mockSpiesRefHack extends Record<keyof UserEventApis, mockSpiesEntry> {
+  (): void
+}
+// make the tests more readable by applying the typecast here
+function getSpy(k: keyof UserEventApis) {
+  return (mockSpies as mockSpiesRefHack)[k].mock
+}
+function getReal(k: keyof UserEventApis) {
+  return (mockSpies as mockSpiesRefHack)[k].real
+}
+
+/**
+ * Mock an API module by replacing some of the exports with spies.
+ */
+function mockApis(modulePath: string, ...vars: string[]) {
+  // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
+  const real = jest.requireActual(modulePath)
+  const fake: Record<string, jest.Mock> = {}
+  for (const key of vars) {
+    const mock = jest.fn()
+    ;(mockSpies as mockSpiesRefHack)[key as keyof UserEventApis] = {
+      mock,
+      // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
+      real: real[key],
+    }
+    fake[key] = mock
+  }
+  return {
+    __esmodule: true,
+    ...real,
+    ...fake,
+  }
+}
+
+// List of API functions per module
+jest.mock('../clear', () => mockApis('../clear', 'clear'))
+jest.mock('../click', () => mockApis('../click', 'click', 'dblClick'))
+jest.mock('../hover', () => mockApis('../hover', 'hover', 'unhover'))
+jest.mock('../keyboard', () => mockApis('../keyboard', 'keyboard'))
+jest.mock('../paste', () => mockApis('../paste', 'paste'))
+jest.mock('../select-options', () =>
+  mockApis('../select-options', 'selectOptions', 'deselectOptions'),
+)
+jest.mock('../tab', () => mockApis('../tab', 'tab'))
+jest.mock('../type', () => mockApis('../type', 'type'))
+jest.mock('../upload', () => mockApis('../upload', 'upload'))
+
+beforeEach(() => {
+  jest.resetAllMocks()
+
+  // Apply the mock implementation. Any earlier implementation would be removed per `resetAllMocks`.
+  for (const key of Object.keys(mockSpies as mockSpiesRefHack)) {
+    getSpy(key as keyof UserEventApis).mockImplementation(
+      // eslint-disable-next-line @typescript-eslint/no-unsafe-argument,@typescript-eslint/no-explicit-any
+      getReal(key as keyof UserEventApis) as any,
+    )
+  }
+})
+
+/// end of mocking
+
+type APICase<T = keyof UserEventApis> = {
+  api: T
+  args?: unknown[]
+  elementArg?: number
+  optionsArg?: number
+  options?: Record<string, unknown>
+  optionsSub?: Record<string, unknown>
+}
+
+cases<APICase>(
+  'apply option defaults',
+  ({api, args = [], elementArg, optionsArg, options, optionsSub}) => {
+    const {element} = setup<HTMLInputElement>(
+      ['selectOptions', 'deselectOptions'].includes(api)
+        ? `<select multiple><option>foo</option></select>`
+        : api === 'upload'
+        ? `<input type="file"/>`
+        : `<input/>`,
+    )
+    element.focus()
+
+    if (elementArg !== undefined) {
+      args[elementArg] = element
+    }
+
+    const apis = userEvent.setup(options)
+
+    ;(apis[api] as Function)(...args)
+
+    const spy = getSpy(api)
+    expect(spy).toBeCalledTimes(1)
+
+    // ensure that options are applied correctly
+    if (optionsArg !== undefined && options) {
+      expect(spy.mock.calls[0][optionsArg]).toEqual(
+        expect.objectContaining(options),
+      )
+    }
+
+    const subOptions = {
+      // just flip boolean values
+      ...Object.fromEntries(
+        Object.entries(options ?? {}).map(([key, value]) => [
+          key,
+          typeof value === 'boolean' ? !value : value,
+        ]),
+      ),
+      ...optionsSub,
+    }
+    const subApis = apis.setup(subOptions)
+
+    ;(subApis[api] as Function)(...args)
+
+    expect(spy).toBeCalledTimes(2)
+
+    // ensure that the new set of api receives different defaults
+    if (optionsArg !== undefined) {
+      expect(spy.mock.calls[1][optionsArg]).toEqual(
+        expect.objectContaining(subOptions),
+      )
+    }
+  },
+  {
+    clear: {api: 'clear', elementArg: 0},
+    click: {
+      api: 'click',
+      elementArg: 0,
+      optionsArg: 2,
+      options: {
+        skipPointerEventsCheck: true,
+      },
+    },
+    dblClick: {
+      api: 'dblClick',
+      elementArg: 0,
+      optionsArg: 2,
+      options: {
+        skipPointerEventsCheck: true,
+      },
+    },
+    hover: {
+      api: 'hover',
+      elementArg: 0,
+      optionsArg: 2,
+      options: {
+        skipPointerEventsCheck: true,
+      },
+    },
+    unhover: {
+      api: 'unhover',
+      elementArg: 0,
+      optionsArg: 2,
+      options: {
+        skipPointerEventsCheck: true,
+      },
+    },
+    keyboard: {
+      api: 'keyboard',
+      args: ['foo'],
+      optionsArg: 1,
+      options: {
+        keyboardMap: [{key: 'x', code: 'SpecialKey'}],
+      },
+      optionsSub: {
+        keyboardMap: [{key: 'y', code: 'SpecialKey'}],
+      },
+    },
+    paste: {api: 'paste', args: [null, 'foo'], elementArg: 0},
+    selectOptions: {
+      api: 'selectOptions',
+      args: [null, ['foo']],
+      elementArg: 0,
+      optionsArg: 3,
+      options: {
+        skipPointerEventsCheck: true,
+      },
+    },
+    deSelectOptions: {
+      api: 'deselectOptions',
+      args: [null, ['foo']],
+      elementArg: 0,
+      optionsArg: 3,
+      options: {
+        skipPointerEventsCheck: true,
+      },
+    },
+    tab: {
+      api: 'tab',
+      optionsArg: 0,
+      options: {
+        focusTrap: document.querySelector('body'),
+      },
+    },
+    type: {
+      api: 'type',
+      args: [null, 'foo'],
+      elementArg: 0,
+      optionsArg: 2,
+      options: {
+        skipClick: true,
+      },
+    },
+    upload: {
+      api: 'upload',
+      elementArg: 0,
+      optionsArg: 3,
+      options: {
+        applyAccept: true,
+      },
+    },
+  },
+)
+
+test('maintain `keyboardState` through different api calls', async () => {
+  const {element, getEvents} = setup<HTMLInputElement>(`<input/>`)
+  element.focus()
+
+  const api = userEvent.setup()
+
+  expect(api.keyboard('{a>}{b>}')).toBe(undefined)
+
+  expect(getSpy('keyboard')).toBeCalledTimes(1)
+
+  expect(element).toHaveValue('ab')
+  expect(getEvents('keyup')).toHaveLength(0)
+
+  await expect(api.keyboard('{/a}', {delay: 1})).resolves.toBe(undefined)
+
+  expect(element).toHaveValue('ab')
+  expect(getEvents('keyup')).toHaveLength(1)
+
+  api.setup({}).keyboard('b')
+
+  expect(element).toHaveValue('abb')
+  // if the state is shared through api the already pressed `b` is automatically released
+  expect(getEvents('keyup')).toHaveLength(3)
+})

src/index.ts

@@ -1,26 +1,11 @@
-import {click, dblClick} from './click'
-import {type} from './type'
-import {clear} from './clear'
-import {tab} from './tab'
-import {hover, unhover} from './hover'
-import {upload} from './upload'
-import {selectOptions, deselectOptions} from './select-options'
-import {paste} from './paste'
-import {keyboard, specialCharMap} from './keyboard'
+import {specialCharMap} from './keyboard'
+import {userEventApis, UserEventApis, setup} from './setup'
 
-const userEvent = {
-  click,
-  dblClick,
-  type,
-  clear,
-  tab,
-  hover,
-  unhover,
-  upload,
-  selectOptions,
-  deselectOptions,
-  paste,
-  keyboard,
+const userEvent: UserEventApis & {
+  setup: typeof setup
+} = {
+  ...userEventApis,
+  setup,
 }
 
 export default userEvent

src/keyboard/index.ts

@@ -59,7 +59,7 @@ export function keyboardImplementationWrapper(
   }
 }
 
-function createKeyboardState(): keyboardState {
+export function createKeyboardState(): keyboardState {
   return {
     activeElement: null,
     pressed: [],