Added missing tests for Standalone fusebox shell

[chicio]

Summary:

This PR adds the missing test coverage for the standalone Fusebox debugger shell in StandaloneFuseboxShell-test.
First, I added some missing expectation for the success case (enableStandaloneFuseboxShell=true and no errors) already present:

• the assertion that unstable_prepareFuseboxShell is called just one time during middleware initialization
• the assertion that launchDebuggerAppWindow is never called when the standalone shell is available

Then, I added the missing test for the case when unstable_prepareFuseboxShell returns one of the error code like eg. platform_not_supported (as reported also in the TODO that I removed).
In this way now the test is verifying the full behaviour for the new standalone mode for debugger/dev tools.

Changelog:

[GENERAL] [CHANGED] - Added missing tests for Standalone fusebox shell

Test Plan:

• Ran StandaloneFuseboxShell-test and verify all tests cases passed
• Ran the full React Native test suite to ensure all tests pass.
• Verified test correctness by intentionally breaking production code:
  • removing the calls to the DefaultBrowserLauncher in openDebuggerMiddleware to verify that the tests were correctly failing

[chicio]

Hi @Abbondanzo, I created yet another PR to add some missing test 😅 (I'm using this pr to explore the code base). Can you help me to import also this one? Sorry to continuously bother you. I hope my small contributions are helpful 🙏

PS this one I think can be helpful because it is on something new. Thanks again 🙏

[Abbondanzo]

Hi @Abbondanzo, I created yet another PR to add some missing test 😅 (I'm using this pr to explore the code base). Can you help me to import also this one? Sorry to continuously bother you. I hope my small contributions are helpful 🙏

PS this one I think can be helpful because it is on something new. Thanks again 🙏

All good! The contributions are always welcome, they help a ton so thanks for making them 😄

[meta-codesync]

@Abbondanzo has imported this pull request. If you are a Meta employee, you can view this in D93157076.

[chicio]

All good! The contributions are always welcome, they help a ton so thanks for making them 😄

Thank you so much @Abbondanzo!! This weekend I will find a new thing to explore/work on ☺️.
Let me know if I have to do anything else/there anything I should fix.

It is always a pleasure to meet someone so supportive 🙏