Simulator tests aren't aligned with the current branch version

[julienjpk]

The following errors occur when testing:

• All tests : the add method expects a callback parameter. A dummy function can be used (when expectAddSensorError isn't).
• Type property is invalid : this test uses a 0 frequency, which is invalid. The same happens in all "sensor type errors" tests.
• Sensor name already used : this test doesn't add twice, when it should. The second error expect therefore fails.

Commit c506acd updates error messages but does not fix these.

[Alekshar]

"Sensor name already used : this test doesn't add twice, when it should. The second error expect therefore fails."
It does call add twice but the second call is through expectAddSensorError

other errors have been fixed