Mocking or stubbing Sentry for testing

[jenstroeger]

Hello,

If I wanted to test code that’s been instrumented by Sentry, or if I wanted to test that my own filters work as expected, then I would want to run tests without Sentry actually sending off anything. (Related discussion #4499.)

There’s some documentation here on passing a custom Transport object when initializing Sentry, but there’s not much information on subclassing Transports. Reading the code it seems the capture_envelope() methods needs to be overridden:

>>> import sentry_sdk
>>> 
>>> class PrintTransport(sentry_sdk.Transport):
...     def capture_envelope(self, envelope):
...         print("SENTRY", envelope)
...         

However, when I initialize Sentry

>>> sentry_sdk.init(dsn=None, transport=PrintTransport(), transport_queue_size=0)
<sentry_sdk._init_implementation._InitGuard object at 0x10847b770>

and then trigger an error

>>> 1 / 0
Traceback (most recent call last):
  File "<python-input-7>", line 1, in <module>
    1 / 0
    ~~^~~
ZeroDivisionError: division by zero

I had expected the print() output but that didn’t happen.

What am I missing here? Thanks!