Tests are failing with SDK 27

Tests are failing with sdk 27 even in the example project.

Environment

Packages: (wanted => installed)
  expo: ^27.0.1 => 27.0.1
  react: 16.3.1 => 16.3.1
  react-native: https://github.com/expo/react-native/archive/sdk-27.0.0.tar.gz => 0.55.2

Steps to Reproduce

(Write your steps here:)

1. exp init test
2. Chose tab layout
3. cd test
4. npm install
5. npm test

Expected Behavior

Test should run fine.

Actual Behavior

Actual test output:

PASS  components/__tests__/StyledText-test.js

RUNS  __tests__/App-test.js

Test Suites: 1 passed, 1 of 2 total
Tests:       1 passed, 1 total
Snapshots:   1 passed, 1 total
Time:        3s/app/test/node_modules/react-native/Libraries/Interaction/TaskQueue.js:1
({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,global,jest){'use strict';var _extends=Object.assign||function(target){for(var i=1;i<arguments.length;i++){var source=arguments[i];for(var key in source){if(Object.prototype.hasOwnProperty.call(source,key)){target[key]=source[key];}}}return target;};var _createClass=function(){function defineProperties(target,props){for(var i=0;i<props.length;i++){var descriptor=props[i];descriptor.enumerable=descriptor.enumerable||false;descriptor.configurable=true;if("value"in descriptor)descriptor.writable=true;Object.defineProperty(target,descriptor.key,descriptor);}}return function(Constructor,protoProps,staticProps){if(protoProps)defineProperties(Constructor.prototype,protoProps);if(staticProps)defineProperties(Constructor,staticProps);return Constructor;};}();function _classCallCheck(instance,Constructor){if(!(instance instanceof Construc

TypeError: TaskQueue: Error with task : Cannot read property 'Object.<anonymous>' of null
   at Runtime._execModule (/app/test/node_modules/jest-runtime/build/index.js:447:72)
   at Runtime.requireModule (/app/test/node_modules/jest-runtime/build/index.js:265:14)
   at Runtime.requireModuleOrMock (/app/test/node_modules/jest-runtime/build/index.js:337:19)
   at parseErrorStack (/app/test/node_modules/react-native/Libraries/Core/Devtools/parseErrorStack.js:1:179)
   at updateWarningMap (/app/test/node_modules/react-native/Libraries/ReactNative/YellowBox.js:1:3858)
   at BufferedConsole.Object.<anonymous>.console.warn (/app/test/node_modules/react-native/Libraries/ReactNative/YellowBox.js:1:2598)
   at Component.measureInWindow (/app/test/node_modules/react-native/jest/setup.js:1:2534)
   at SafeView._this._onLayout (/app/test/node_modules/react-native
RUNS  __tests__/App-test.js

Test Suites: 1 passed, 1 of 2 total
Tests:       1 passed, 1 total
Snapshots:   1 passed, 1 total
Time:        5s

Not sure if it’s a expo related bug. After upgrading my project from sdk 26 to 27 it appears.

[MainAero]

The tests are failing (or running forever) when a console warn message occurs. Which is the case in the example project:

console.warn node_modules/react-native/Libraries/ReactNative/YellowBox.js:85
      Calling .measureInWindow() in the test renderer environment is not supported. Instead, mock out your components that use findNodeHandle with replacements that don't rely on the native environment.

This will trigger a call to parseErrorStack() a react-native devtools library method. Inside this method a other module is required. The require call is done after torn down of jest which will lead to the unexpected behavior of jest.

My workaround for now is to add require('stacktrace-parser'); to my own setupJest.js file:

package.json:

...
"jest": {
    "preset": "jest-expo",
    "setupTestFrameworkScriptFile": "./setupJest"
},
...

setupJest.js:

require('stacktrace-parser');
...

I will investigate further how to get a serious fix for that.

[ide]

The original repro commands with the current version of Expo (SDK 35) work now:

expo init test
# follow setup instructions. i used yarn instead of npm.
cd test
yarn test
# tests pass