feat: mock mode

[Tienisto]

Changes

Fixes #2247.

Checklist

• An issue to be fixed by this PR is listed above.
• New tests are added to ensure new features are working. Please refer to this page to see how to add a test.
• ./frb_internal precommit --mode slow (or fast) is run (it internal runs code generator, does auto formatting, etc).
• If this PR adds/changes features, documentations (in the ./website folder) are updated.
• CI is passing. Please refer to this page to see how to solve a failed CI.

Remark for PR creator

• ./frb_internal --help shows utilities for development.
• If fzyzcjy does not reply for a few days, maybe he just did not see it, so please ping him.

[welcome]

Hi! Thanks for opening this pull request! 😄

[fzyzcjy]

Good job! Some nits

1. I am wondering, for user-facing API, whether we should make it a separate function initMock, or the same function with an extra arg init({..., bool mock})? (I think both have pros and cons...)
2. To fix CI, try ./frb_internal precommit-generate (which takes at least several minutes to run since it runs codegen in debug mode for many folders)

[Tienisto]

Thanks for the quick response!

Actually, I had it like init({..., bool mock}) originally. However, I thought it would be unclear what parameters are used and I didn't like that api is optional while it is not when mock is true.
A separate function would be more type safe in this case.
I am fine with both solutions though.

Edit: I've run ./frb_internal precommit-generate but it doesn't seem to fix all issues. Do you know what's missing?

[fzyzcjy]

You are welcome!

However, I thought it would be unclear what parameters are used and I didn't like that api is optional while it is not when mock is true.
A separate function would be more type safe in this case.

Looks pretty reasonable.

I've run ./frb_internal precommit-generate but it doesn't seem to fix all issues. Do you know what's missing?

Looks like need to edit https://github.com/fzyzcjy/flutter_rust_bridge/tree/master/frb_codegen/assets/integration_template/shared (e.g. copy-paste/modify things according to the CI hint) which is the template

[Tienisto]

Thanks! I am currently not at home so feel free to add it. Otherwise, I will add it tomorrow

[fzyzcjy]

@all-contributors please add @Tienisto for code

[allcontributors]

@fzyzcjy

I've put up a pull request to add @Tienisto! 🎉

[welcome]

Hi! Congrats on merging your first pull request! 🎉

[fzyzcjy]

@Tienisto Looks like codecov is unhappy (see below; not sure why codecov does not appear in this PR...). Maybe we can add a few lines in https://github.com/fzyzcjy/flutter_rust_bridge/blob/master/frb_example/pure_dart/test/mockability_test.dart to test this code path.

https://app.codecov.io/gh/fzyzcjy/flutter_rust_bridge/commit/c5bdedbbb1b222162bdc88d28e96313b687007a8