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@justinmc justinmc commented Nov 18, 2025

This PR adds a lint rule to catch imports between Material, Cupertino, and Widgets in tests. Spun out of #177029 and the Decoupling Tests design doc.

For now, Material will be the place to put tests that need to import both Material and Cupertino. See #178693 (comment).

I used #130523 as a reference to create this PR.

Still some cleanup to do. Need to error when a test in the "known" list
is not found anymore.
@justinmc justinmc self-assigned this Nov 18, 2025
filesByLibrary[Library.cupertino]!,
Library.material,
);

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What about Material importing Cupertino?

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Material importing Cupertino is allowed, at least for now. Material will continue to contain platform adaptive code (like Switch.adaptive), and it will also be responsible for testing interactions that involve both Material and Cupertino.

@justinmc justinmc marked this pull request as ready for review December 2, 2025 22:12
///
/// The Material library should contain tests that verify behaviors involving
/// multiple libraries, such as platform adaptivity. Otherwise, these libraries
/// should not import each other in tests.
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I really like the bullet point rules in the "Overview" section of your flutter.dev/go/decoupling-framework-tests doc:

  • The Cupertino library/tests should never import Material. It should test its widgets under a full-Cupertino scenario.
  • The Material library should test its widgets in a full-Material scenario.
  • Design languages are responsible for testing their interoperability with Widgets.
  • Tests that cover interoperability between Material and Cupertino should go in Material. See the next section for when and how interoperability should be tested.
  • The Widgets library/tests should never import Cupertino or Material.

What do you think of copying the bullet point rules here? I don't feel strongly about this, feel free to skip.

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I like it, I hope we can properly communicate the ideas in that design doc. This also reminded me to create an issue (#179429) about explaining this sort of thing in the test README files.

@auto-submit auto-submit bot added this pull request to the merge queue Dec 30, 2025
Merged via the queue into flutter:master with commit d37058b Dec 30, 2025
149 checks passed
@flutter-dashboard flutter-dashboard bot removed the autosubmit Merge PR when tree becomes green via auto submit App label Dec 30, 2025
@justinmc justinmc deleted the cross-import-lint branch December 30, 2025 20:40
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Roll Flutter from 60d8165b11e2 to 13b2b912c909 (34 revisions)

flutter/flutter@60d8165...13b2b91

2026-01-03 [email protected] Roll Skia from 229239fde9e9 to 2f257bbea23a (1 revision) (flutter/flutter#180461)
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2026-01-02 [email protected] Add SK_SUPPORT_LEGACY_UNSPANNED_GRADIENTS to SkUserConfig.h (flutter/flutter#180443)
2026-01-02 [email protected] Some cleanup of cross library test imports (flutter/flutter#177029)
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2025-12-30 [email protected] [Framework] iOS style blurring and `ImageFilterConfig` (flutter/flutter#175473)
2025-12-30 [email protected] Fix issue with getUniformFloat crashing with hot reload (flutter/flutter#180138)
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engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Jan 4, 2026
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4 participants