TestFixtures refactoring

[SimonMarquis]

Support for Kotlin TestFixtures on Android modules was added in AGP 8.5.0!

A lot more cleanup could be done, especially on test classes that redefine over and over again topics, newsResources, etc.

This is a new take on this PR:

• https://github.com/android/nowinandroid/pull/452

To close this issue from 2022:

• https://github.com/android/nowinandroid/issues/451

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The main changes are split by commits:

• AGP 8.5.0 update with enableTestFixturesKotlinSupport flag
• :core:data-test, :sync:test and :core:datastore-test have been merged as testFixtures sourceSet of their respective module.
• :core:testing content has been migrated when possible to already existing modules.
• :sync:work has been move to it's parent :sync module that was previously empty.

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• [ ] Regenerate graphs
• [ ] Wait for android.experimental.enableTestFixturesKotlinSupport to promote from experimental?
• [ ] Wait for KSP on testFixtures?

[keyboardsurfer]

This PR has a lot of conflicts. Do you want to continue and resolve these, @SimonMarquis ?

[SimonMarquis]

@keyboardsurfer yes, I'd love to see this integrated in the repository at some point (the initial PoC was on Nov 19, 2022 😅). But before I re-start working on this and fix conflicts, can you tell me if this is definitely something that will be merged in the repository or not? Thanks

[keyboardsurfer]

Good to hear that you're interested in picking this back up again. @JoseAlcerreca can you chime in on the likelihood of this PR being integrated into main?

[dturner]

Just to add my 2 pence, I am strongly in favour of anything that tidies up our test architecture and TestFixtures seems to do that.

[SimonMarquis]

Just to add my 2 pence, I am strongly in favour of anything that tidies up our test architecture and TestFixtures seems to do that.

Does that mean "yes", or "maybe"? 😅