'tag.htm'; break; case 'flag': $pre .= $default_pre .= 'flag.htm'; break; case 'my': $pre .= $default_pre .= 'my.htm'; break; case 'my_password': $pre .= $default_pre .= 'my_password.htm'; break; case 'my_bind': $pre .= $default_pre .= 'my_bind.htm'; break; case 'my_avatar': $pre .= $default_pre .= 'my_avatar.htm'; break; case 'home_article': $pre .= $default_pre .= 'home_article.htm'; break; case 'home_comment': $pre .= $default_pre .= 'home_comment.htm'; break; case 'user': $pre .= $default_pre .= 'user.htm'; break; case 'user_login': $pre .= $default_pre .= 'user_login.htm'; break; case 'user_create': $pre .= $default_pre .= 'user_create.htm'; break; case 'user_resetpw': $pre .= $default_pre .= 'user_resetpw.htm'; break; case 'user_resetpw_complete': $pre .= $default_pre .= 'user_resetpw_complete.htm'; break; case 'user_comment': $pre .= $default_pre .= 'user_comment.htm'; break; case 'single_page': $pre .= $default_pre .= 'single_page.htm'; break; case 'search': $pre .= $default_pre .= 'search.htm'; break; case 'operate_sticky': $pre .= $default_pre .= 'operate_sticky.htm'; break; case 'operate_close': $pre .= $default_pre .= 'operate_close.htm'; break; case 'operate_delete': $pre .= $default_pre .= 'operate_delete.htm'; break; case 'operate_move': $pre .= $default_pre .= 'operate_move.htm'; break; case '404': $pre .= $default_pre .= '404.htm'; break; case 'read_404': $pre .= $default_pre .= 'read_404.htm'; break; case 'list_404': $pre .= $default_pre .= 'list_404.htm'; break; default: $pre .= $default_pre .= theme_mode_pre(); break; } if ($config['theme']) { $conffile = APP_PATH . 'view/template/' . $config['theme'] . '/conf.json'; $json = is_file($conffile) ? xn_json_decode(file_get_contents($conffile)) : array(); } !empty($json['installed']) and $path_file = APP_PATH . 'view/template/' . $config['theme'] . '/htm/' . ($id ? $id . '_' : '') . $pre; (empty($path_file) || !is_file($path_file)) and $path_file = APP_PATH . 'view/template/' . $config['theme'] . '/htm/' . $pre; if (!empty($config['theme_child']) && is_array($config['theme_child'])) { foreach ($config['theme_child'] as $theme) { if (empty($theme) || is_array($theme)) continue; $path_file = APP_PATH . 'view/template/' . $theme . '/htm/' . ($id ? $id . '_' : '') . $pre; !is_file($path_file) and $path_file = APP_PATH . 'view/template/' . $theme . '/htm/' . $pre; } } !is_file($path_file) and $path_file = APP_PATH . ($dir ? 'plugin/' . $dir . '/view/htm/' : 'view/htm/') . $default_pre; return $path_file; } function theme_mode_pre($type = 0) { global $config; $mode = $config['setting']['website_mode']; $pre = ''; if (1 == $mode) { $pre .= 2 == $type ? 'portal_category.htm' : 'portal.htm'; } elseif (2 == $mode) { $pre .= 2 == $type ? 'flat_category.htm' : 'flat.htm'; } else { $pre .= 2 == $type ? 'index_category.htm' : 'index.htm'; } return $pre; } ?>javascript - Jest mock is undefined when inspecting it - Stack Overflow
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javascript - Jest mock is undefined when inspecting it - Stack Overflow

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I have a module that uses a second module. They're both custom modules, not NPM packages.

I want to make sure that moduleUnderTest calls a specific method from foo.

So I'm using jest.mock and I pass it a function that has the same signature as foo but contains jest spy functions instead of the actual implementation.

I was under the impression that using jest.mock with the mockFoo object would inject the mocked foo instead of the actual module when moduleUnderTest requires foo.

If I inspect what foo is from within moduleUnderTest while the test is running, I can see that it is indeed my mocked foo.

But when I get to the expect, mockedFoo.met1 bees undefined.

Why is that?

// ../foo/foo.js
const foo = arg => {
  console.log(arg)
  return {
    met1: () => {},
    met2: () => {},
  }
}

module.exports = foo

// ..foo/index.js
// I am doing it this way so I can put the actual implementation in 
// several different files, but can require the whole module with 
// require('../foo') rather than require('../foo/foo')
module.exports = require('./foo')

// ./moduleUnderTest.js
const foo = require('../foo')('hi')

require('util').inspect(foo) // it seems that foo is indeed the mocked
  // version here[0]

const moduleUnderTest = () => {
  foo.met1()
}

module.exports = moduleUnderTest

// ./moduleUnderTest.test.js
const moduleUnderTest = require('./moduleUnderTest')
const mockFoo = () => ({
  met1: jest.fn(),
  met2: jest.fn(),
})
jest.mock('../foo')

test('foo.met1 is called', () => {
  moduleUnderTest()

  expect(mockFoo.met1).toHaveBeenCalledTimes(1) // NOPE![1] 
})

// [0]
//   { met1: 
//     { [Function: mockConstructor]
//       _isMockFunction: true,
//       getMockImplementation: [Function],
//       mock: [Getter/Setter],
//       mockClear: [Function],
//       mockReset: [Function],
//       mockReturnValueOnce: [Function],
//       mockResolvedValueOnce: [Function],
//       mockRejectedValueOnce: [Function],
//       mockReturnValue: [Function],
//       mockResolvedValue: [Function],
//       mockRejectedValue: [Function],
//       mockImplementationOnce: [Function],
//       mockImplementation: [Function],
//       mockReturnThis: [Function],
//       mockName: [Function],
//       getMockName: [Function],
//       mockRestore: [Function] },
//    met2: 
//     { [Function: mockConstructor]
//       _isMockFunction: true,
//       getMockImplementation: [Function],
//       mock: [Getter/Setter],
//       mockClear: [Function],
//       mockReset: [Function],
//       mockReturnValueOnce: [Function],
//       mockResolvedValueOnce: [Function],
//       mockRejectedValueOnce: [Function],
//       mockReturnValue: [Function],
//       mockResolvedValue: [Function],
//       mockRejectedValue: [Function],
//       mockImplementationOnce: [Function],
//       mockImplementation: [Function],
//       mockReturnThis: [Function],
//       mockName: [Function],
//       getMockName: [Function],
//       mockRestore: [Function] } }

// [1]
//  expect(jest.fn())[.not].toHaveBeenCalledTimes()
//  
//  jest.fn() value must be a mock function or spy.
//  Received: undefined

I have a module that uses a second module. They're both custom modules, not NPM packages.

I want to make sure that moduleUnderTest calls a specific method from foo.

So I'm using jest.mock and I pass it a function that has the same signature as foo but contains jest spy functions instead of the actual implementation.

I was under the impression that using jest.mock with the mockFoo object would inject the mocked foo instead of the actual module when moduleUnderTest requires foo.

If I inspect what foo is from within moduleUnderTest while the test is running, I can see that it is indeed my mocked foo.

But when I get to the expect, mockedFoo.met1 bees undefined.

Why is that?

// ../foo/foo.js
const foo = arg => {
  console.log(arg)
  return {
    met1: () => {},
    met2: () => {},
  }
}

module.exports = foo

// ..foo/index.js
// I am doing it this way so I can put the actual implementation in 
// several different files, but can require the whole module with 
// require('../foo') rather than require('../foo/foo')
module.exports = require('./foo')

// ./moduleUnderTest.js
const foo = require('../foo')('hi')

require('util').inspect(foo) // it seems that foo is indeed the mocked
  // version here[0]

const moduleUnderTest = () => {
  foo.met1()
}

module.exports = moduleUnderTest

// ./moduleUnderTest.test.js
const moduleUnderTest = require('./moduleUnderTest')
const mockFoo = () => ({
  met1: jest.fn(),
  met2: jest.fn(),
})
jest.mock('../foo')

test('foo.met1 is called', () => {
  moduleUnderTest()

  expect(mockFoo.met1).toHaveBeenCalledTimes(1) // NOPE![1] 
})

// [0]
//   { met1: 
//     { [Function: mockConstructor]
//       _isMockFunction: true,
//       getMockImplementation: [Function],
//       mock: [Getter/Setter],
//       mockClear: [Function],
//       mockReset: [Function],
//       mockReturnValueOnce: [Function],
//       mockResolvedValueOnce: [Function],
//       mockRejectedValueOnce: [Function],
//       mockReturnValue: [Function],
//       mockResolvedValue: [Function],
//       mockRejectedValue: [Function],
//       mockImplementationOnce: [Function],
//       mockImplementation: [Function],
//       mockReturnThis: [Function],
//       mockName: [Function],
//       getMockName: [Function],
//       mockRestore: [Function] },
//    met2: 
//     { [Function: mockConstructor]
//       _isMockFunction: true,
//       getMockImplementation: [Function],
//       mock: [Getter/Setter],
//       mockClear: [Function],
//       mockReset: [Function],
//       mockReturnValueOnce: [Function],
//       mockResolvedValueOnce: [Function],
//       mockRejectedValueOnce: [Function],
//       mockReturnValue: [Function],
//       mockResolvedValue: [Function],
//       mockRejectedValue: [Function],
//       mockImplementationOnce: [Function],
//       mockImplementation: [Function],
//       mockReturnThis: [Function],
//       mockName: [Function],
//       getMockName: [Function],
//       mockRestore: [Function] } }

// [1]
//  expect(jest.fn())[.not].toHaveBeenCalledTimes()
//  
//  jest.fn() value must be a mock function or spy.
//  Received: undefined
Share Improve this question asked Apr 1, 2018 at 16:16 springloadedspringloaded 1,0892 gold badges15 silver badges27 bronze badges
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1 Answer 1

Reset to default 2

I found what the issue is.

Because foo is instantiated by executing the function, calling mockFoo.met1 returns undefined since mockFoo is a function. For mock1 to be defined, I'd have to call mockFoo().met1. But at that point I'm getting a new instance of mockFoo which is different from the one loaded and called by moduleUnderTest.

To fix the problem, I have to declare and set the mock this way:

const mockMet1 = jest.fn()
const mockMet2 = jest.fn()
const mockFoo = () => ({
  met1: mockMet1,
  met2: mockMet2,
})
const moduleUnderTest = require('./moduleUnderTest')
jest.mock('../foo', mockFoo)

// ...snip...
afterEach(() => { // resets the called count etc
  mockMet1.resetMock()
  mockMet2.resetMock()
})
// ...snip...
expect(mockMet1).toHaveBeenCalledTimes(1)
// ...snip...
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