[qiaolezi001]

Purpose of the pull request

Fixes #1267.

The shared Checkstyle rules reject AssertJ's assertThat static import although AssertJ is already a test dependency. Allow named imports from common test libraries using Checkstyle's native allowlist.

What's changed?

• Configure a single AvoidStaticImport module with excludes for JUnit Assertions/Assumptions, Mockito Mockito/ArgumentMatchers, and AssertJ Assertions, as requested in review. No XPath, duplicate rules or directory regex filters remain.
• Keep AvoidStarImport unchanged: both static and regular wildcard imports remain forbidden, including imports from the allowlisted libraries. Other static imports remain forbidden.
• Rely on the existing Maven test dependency scope to keep these libraries unavailable to production compilation. The allowlist itself is global; it does not enforce a test-source directory boundary.
• Use assertThat(...).containsExactly(...) in ListUtilsTest alongside the existing JUnit assertions, preserving size, order and content coverage.
• Update AGENTS.md and the configuration comment to describe the lint rule and Maven scope accurately.

Validation

Latest review update: only replaces the introductory XML comment block with a scope warning beside AvoidStaticImport. Parsed XML modules and property values are identical to 2171455. Six-module validate spotless:check and git diff --check passed for this update. The full test suite was not rerun for the comment-only change; the functional validation below was completed on 2171455, whose nine GitHub checks also passed.

• 25 standalone Checkstyle 9.3 fixtures passed: named imports from all five owners are allowed; other static imports, similar owner names, and regular/static wildcard imports are rejected. Also covers multiline imports and Windows-style paths. Expected outcomes reflect the global allowlist.
• Resolved fesod-common's actual compile/test classpaths with Maven and ran ten compiler checks: named imports from each of the five allowlisted owners fail on the production compile classpath and succeed on the test classpath.
• ./mvnw -B validate spotless:check: all six modules passed.
• ./mvnw -B clean package -pl fesod-common,fesod-shaded,fesod-sheet: 1,836 tests, 0 failures, 0 errors, 0 skips.
• git diff --check passed for the changed files.

This revision was validated on Temurin JDK 25.0.5 using a workspace-local Maven cache and isolated temporary directories. No tests or assertions were modified or skipped for the review update. The multi-JDK matrix was not run locally; the new head must complete GitHub CI.

Checklist

• I have read the Contributor Guide.
• I have written the necessary doc or comment.
• I have updated the necessary unit tests and all cases have passed.

[bengbengbalabalabeng]

Thanks for refactoring!

IMO having two separate rules with regex filters is still a bit overkill here. Since JUnit/Mockito/AssertJ are already scoped to test in Maven, src/main won't compile if someone tries to import them anyway.

Can we just keep it simple with a single AvoidStaticImport module and excludes. WDYT?

[nkuprins]

LGTM. Thank you for your first contribution!