Add detailed unit test for Verification.verifyMobile()

We had an issue with incorrect expiration check (which have appeared after refactoring during new Zoom integration)

For prevent similar situations in the future we should test all cases:
- empty code was passed 
- code doesnt matches
- code was expired

```javascript
await expect(verifyMobile(<test user>, { otp: <test OTP> })).rejects.toThrow('No code to validate, retry')
// other cases
```