Component tests don't show up

[jim108dev]

Hi! I did

git clone https://github.com/Urigo/WhatsApp-Clone-Client-React.git
git checkout master-step9
yarn install

Added unknown to history (#1587)

yarn test

Only App.test.tsx shows up. Although not xit tests for for example ChatNavbar.test.tsx don't show up.

 PASS  src/App.test.tsx
  ✓ renders without crashing (70ms)

Test Suites: 1 passed, 1 total
Tests:       1 passed, 1 total
Snapshots:   0 total
Time:        2.813s, estimated 3s

Thanks