error: "Cannot set property 'builder' of undefined"

[joeeames]

Describe the bug
When running either "ng add @briebug/jest-schematic" or "ng g @briebug/jest-schematic:add" the error "Cannot set property 'builder' of undefined" is given

To Reproduce
Steps to reproduce the behavior:

1. Go to https://github.com/joeeames/UnitTestingAngularLikeABoss/tree/jest-solution
2. clone, make sure you're on the jest-solution branch.
3. npm i
4. execute either of the two commands above
5. See error

Expected behavior
no error

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: [Mac & Windows]
• Node version: [14.7.0]
• NPM or Yarn version [npm 6.14.7]
• App type [Angular CLI]
• Angular version [10.1.5]

Additional context
This was discovered on a windows box, then verified on a separate Mac

[schuchard]

Thanks for reporting @joeeames, I'll investigate.

[schuchard]

I've updated the tests to check for your type of example, which was an angular.json project config without a test builder path. I tested against your repo and it ran successfully. Let me know if you still have an issue.