Mocking Backbone throws an error

[maspwr]

Here's a very simple example showing how requiring Backbone will cause Jest to fail.

https://github.com/maspwr/backbone-jest/tree/master

TypeError: /Users/mark/projects/gitp/backbone-jest/__tests__/FailingTest.js: Cannot read property 'protocol' of undefined
  at Location.protocol (/Users/mark/projects/gitp/backbone-jest/node_modules/jest-cli/node_modules/jsdom/lib/jsdom/browser/location.js:18:36)
  at _getMetadata (/Users/mark/projects/gitp/backbone-jest/node_modules/jest-cli/src/lib/moduleMocker.js:279:49)
  at _getMetadata (/Users/mark/projects/gitp/backbone-jest/node_modules/jest-cli/src/lib/moduleMocker.js:286:23)
  at _getMetadata (/Users/mark/projects/gitp/backbone-jest/node_modules/jest-cli/src/lib/moduleMocker.js:279:27)
  at _getMetadata (/Users/mark/projects/gitp/backbone-jest/node_modules/jest-cli/src/lib/moduleMocker.js:279:27)
  at _getMetadata (/Users/mark/projects/gitp/backbone-jest/node_modules/jest-cli/src/lib/moduleMocker.js:279:27)
  at Object.module.exports.getMetadata (/Users/mark/projects/gitp/backbone-jest/node_modules/jest-cli/src/lib/moduleMocker.js:388:20)
  at Loader._generateMock (/Users/mark/projects/gitp/backbone-jest/node_modules/jest-cli/src/HasteModuleLoader/HasteModuleLoader.js:280:56)
  at Loader.requireMock (/Users/mark/projects/gitp/backbone-jest/node_modules/jest-cli/src/HasteModuleLoader/HasteModuleLoader.js:782:43)
  at Loader.requireModuleOrMock (/Users/mark/projects/gitp/backbone-jest/node_modules/jest-cli/src/HasteModuleLoader/HasteModuleLoader.js:897:17)
  at /Users/mark/projects/gitp/backbone-jest/__tests__/FailingTest.js:1:83
  at Object.runContentWithLocalBindings (/Users/mark/projects/gitp/backbone-jest/node_modules/jest-cli/src/lib/utils.js:309:17)
  at Loader._execModule (/Users/mark/projects/gitp/backbone-jest/node_modules/jest-cli/src/HasteModuleLoader/HasteModuleLoader.js:243:9)
  at Loader.requireModule (/Users/mark/projects/gitp/backbone-jest/node_modules/jest-cli/src/HasteModuleLoader/HasteModuleLoader.js:879:10)
  at jasmineTestRunner (/Users/mark/projects/gitp/backbone-jest/node_modules/jest-cli/src/jasmineTestRunner/jasmineTestRunner.js:225:16)
  at /Users/mark/projects/gitp/backbone-jest/node_modules/jest-cli/src/TestRunner.js:369:12
  at _fulfilled (/Users/mark/projects/gitp/backbone-jest/node_modules/jest-cli/node_modules/q/q.js:798:54)
  at self.promiseDispatch.done (/Users/mark/projects/gitp/backbone-jest/node_modules/jest-cli/node_modules/q/q.js:827:30)
  at Promise.promise.promiseDispatch (/Users/mark/projects/gitp/backbone-jest/node_modules/jest-cli/node_modules/q/q.js:760:13)
  at /Users/mark/projects/gitp/backbone-jest/node_modules/jest-cli/node_modules/q/q.js:574:44
  at flush (/Users/mark/projects/gitp/backbone-jest/node_modules/jest-cli/node_modules/q/q.js:108:17)
  at /Users/mark/projects/gitp/backbone-jest/node_modules/jest-cli/src/lib/FakeTimers.js:234:7
  at process._tickCallback (node.js:419:13)

[d1b1]

+1

[chris-ramon]

Adding backbone path to unmockedModulePathPatterns fixes this.

package.json

{
  "scripts": {
    "test": "jest"
  },
  "jest": {
    "unmockedModulePathPatterns": ["./node_modules/backbone"]
  },
  "dependencies": {
    "backbone": "^1.1.2",
    "jquery": "^2.1.1",
    "requirejs": "^2.1.14",
    "underscore": "^1.6.0"
  }
}

[tiagob]

+1

[ghost]

Thank you for reporting this issue and appreciate your patience. We've notified the core team for an update on this issue. We're looking for a response within the next 30 days or the issue may be closed.

[nurrony]

@facebook-github-bot-4 What is the condition of this issue?

[cpojer]

I'd recommend not mocking Backbone. It probably uses some meta programming that we can't mock properly.

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.
Please note this issue tracker is not a help forum. We recommend using StackOverflow or our discord channel for questions.