npm test

> demo-project@0.0.0 test
> jest

 PASS  src/demo.test.ts
  ✓ demo (2 ms)

Test Suites: 1 passed, 1 total
Tests:       1 passed, 1 total
Snapshots:   0 total
Time:        0.477 s, estimated 1 s
Ran all test suites.