chore(typescript): support jest extended in tests

[ghusse]

Definition of Done

General

• [ ] Write an explicit title for the Pull Request, following Conventional Commits specification
• [ ] Test manually the implemented changes
• [ ] Validate the code quality (indentation, syntax, style, simplicity, readability)

Security

• [ ] Consider the security impact of the changes made

[codeclimate[bot]]

Code Climate has analyzed commit 1b2815bf and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (70% is the threshold).

This pull request will bring the total coverage in the repository to 60.9% (0.0% change).

View more on Code Climate.

[forest-bot]

:tada: This PR is included in version 10.0.0-beta.1 :tada:

The release is available on:

• npm package (@beta dist-tag)
• GitHub release
• v10.0.0-beta.1

Your semantic-release bot :package::rocket:

[forest-bot]

:tada: This PR is included in version 10.0.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release
• v10.0.0

Your semantic-release bot :package::rocket: