Summary:
https://github.com/facebook/react-native/pull/25671 added a shallow unit test for `ReactFiberErrorDialog`, mocking out the (JS) `ExceptionsManager` module. This rewrites that test in terms of `NativeExceptionsManager` instead, so the integration with `ExceptionsManager` is also tested.
Also adds tests for the behaviour of the `framesToPop` and `jsEngine` extended error fields, and for passing a frozen error object (seeing as we potentially mutate the error).
Reviewed By: rickhanlonii
Differential Revision: D16330341
fbshipit-source-id: 0b514d1c8f193a114748739ec31ddb4e06e4d2fd
Moti Zilberman
5029195d22