[two_dimensional_scrollables] Migrate XCTest to Swift Testing

[jmagman]

Part of flutter/flutter#180787

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[gemini-code-assist]

Code Review

This pull request migrates the native tests for the two_dimensional_scrollables example on iOS and macOS from XCTest to the new Swift Testing framework. This involves updating the Swift test files to use the new @Test macro and Testing module, and updating the Xcode project files to set the Swift language version to 6.0 for the test targets. The CHANGELOG.md is also updated to reflect this change.

[Piinks]

LGTM thank you!

[stuartmorgan-g]

These tests should just be removed; it's the placeholder that's part of the template, and we don't ever expect to run these tests in a non-plugin package like this one. Usually we remove them, it just got missed here.

It's dead code from a repo tool perspective, because we won't try to run these tests for a non-plugin package.

[jmagman]

Usually we remove them, it just got missed here.

@stuartmorgan-g Is the right thing to do remove the platform directories from packages/two_dimensional_scrollables/example, similar to packages/vector_graphics/example ? Or just remove the platform tests?

[stuartmorgan-g]

We should leave the platform directory so it's easy to run the example. I'm not sure why vector_graphics doesn't have platform directories; I didn't change it when we imported it from Dan's repo. We don't have a proactive policy about what platforms are in example directories, so it's kind of a hodgepodge right now (e.g., lots of examples don't have desktop support because they predate stable desktop). It's on my mental list of things to try to standardize at some point, but it's pretty far down at the moment.

We should just delete the test file and the XCode test target.

[jmagman]

We should just delete the test file and the XCode test target.

#10801