Handle method references in JUnit Assert to Assertions migration.#901
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timtebeek merged 3 commits intoopenrewrite:mainfrom Jan 30, 2026
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Perfect addition; Let me see if I can trim it down a bit further still; We had added MethodCall as an interface used by both J.MethodInvocation as well as J.MemberReference.
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…rom 3.26.0 to 3.27.0 [skip ci] Bumps [org.openrewrite.recipe:rewrite-testing-frameworks](https://github.com/openrewrite/rewrite-testing-frameworks) from 3.26.0 to 3.27.0. Release notes *Sourced from [org.openrewrite.recipe:rewrite-testing-frameworks's releases](https://github.com/openrewrite/rewrite-testing-frameworks/releases).* > 3.27.0 > ------ > > What's Changed > -------------- > > * Correcting MockWebServer migration for OkHttp by [`@steve-aom-elliott`](https://github.com/steve-aom-elliott) in [openrewrite/rewrite-testing-frameworks#849](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/pull/849) > * Add `ReturnActual` recipe for AssertJ by [`@timtebeek`](https://github.com/timtebeek) in [openrewrite/rewrite-testing-frameworks#891](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/pull/891) > * Add `MockConstructionToTryWithResources` recipe by [`@jkschneider`](https://github.com/jkschneider) in [openrewrite/rewrite-testing-frameworks#892](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/pull/892) > * Add CleanupKotlinJUnit5AssertionImports recipe by [`@jkschneider`](https://github.com/jkschneider) in [openrewrite/rewrite-testing-frameworks#893](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/pull/893) > * Skip Kotlin files in PowerMockitoMockStaticToMockito by [`@jkschneider`](https://github.com/jkschneider) in [openrewrite/rewrite-testing-frameworks#894](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/pull/894) > * Add test cases for `MockedConstruction` pattern by [`@jkschneider`](https://github.com/jkschneider) in [openrewrite/rewrite-testing-frameworks#895](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/pull/895) > * Update byte buddy to a Java 25 compatible version by [`@Laurens-W`](https://github.com/Laurens-W) in [openrewrite/rewrite-testing-frameworks#897](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/pull/897) > * Followup after the formatting merge by [`@Jenson3210`](https://github.com/Jenson3210) in [openrewrite/rewrite-testing-frameworks#900](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/pull/900) > * Skip TemporaryFolder conversion when used in RuleChain. by [`@motlin`](https://github.com/motlin) in [openrewrite/rewrite-testing-frameworks#898](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/pull/898) > * Add JUnit 4 to JUnit 5 exception class migrations. by [`@motlin`](https://github.com/motlin) in [openrewrite/rewrite-testing-frameworks#902](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/pull/902) > * Make declarative recipes singletons by [`@sambsnyd`](https://github.com/sambsnyd) in [openrewrite/rewrite-testing-frameworks#905](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/pull/905) > * Handle method references in JUnit Assert to Assertions migration. by [`@motlin`](https://github.com/motlin) in [openrewrite/rewrite-testing-frameworks#901](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/pull/901) > * Add explicit test scope to AssertJ dependency additions by [`@Jenson3210`](https://github.com/Jenson3210) in [openrewrite/rewrite-testing-frameworks#903](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/pull/903) > * Skip SimplifyChainedAssertJAssertion when actual type has wildcard type parameters by [`@knutwannheden`](https://github.com/knutwannheden) in [openrewrite/rewrite-testing-frameworks#906](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/pull/906) > * Revert "Add explicit test scope to AssertJ dependency additions ([#903](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/issues/903))" by [`@Jenson3210`](https://github.com/Jenson3210) in [openrewrite/rewrite-testing-frameworks#907](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/pull/907) > * Fix AssertThrowsOnLastStatement to preserve parameterized types when extracting arguments. by [`@motlin`](https://github.com/motlin) in [openrewrite/rewrite-testing-frameworks#908](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/pull/908) > * Enhance RemoveInitMocksIfRunnersSpecified to also remove openMocks by [`@dsgrieve`](https://github.com/dsgrieve) in [openrewrite/rewrite-testing-frameworks#904](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/pull/904) > * `RemoveInitMocksIfRunnersSpecified` (or any recipe) should not have a mutable static field by [`@Jenson3210`](https://github.com/Jenson3210) in [openrewrite/rewrite-testing-frameworks#910](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/pull/910) > > New Contributors > ---------------- > > * [`@motlin`](https://github.com/motlin) made their first contribution in [openrewrite/rewrite-testing-frameworks#898](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/pull/898) > * [`@dsgrieve`](https://github.com/dsgrieve) made their first contribution in [openrewrite/rewrite-testing-frameworks#904](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/pull/904) > > **Full Changelog**: <openrewrite/rewrite-testing-frameworks@v3.26.0...v3.27.0> Commits * [`41e6b42`](openrewrite/rewrite-testing-frameworks@41e6b42) Extract documentation examples from tests * [`403dd48`](openrewrite/rewrite-testing-frameworks@403dd48) review comment ([#910](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/issues/910)) * [`e6c383b`](openrewrite/rewrite-testing-frameworks@e6c383b) Delete files * [`cf78c5a`](openrewrite/rewrite-testing-frameworks@cf78c5a) Enhance RemoveInitMocksIfRunnersSpecified to also remove openMocks ([#904](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/issues/904)) * [`75c12cd`](openrewrite/rewrite-testing-frameworks@75c12cd) Fix AssertThrowsOnLastStatement to preserve parameterized types when extracti... * [`07b43cd`](openrewrite/rewrite-testing-frameworks@07b43cd) Revert "Add explicit test scope to AssertJ dependency additions ([#903](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/issues/903))" ([#907](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/issues/907)) * [`3a67bb9`](openrewrite/rewrite-testing-frameworks@3a67bb9) Skip SimplifyChainedAssertJAssertion when actual type has wildcard type param... * [`02eba0f`](openrewrite/rewrite-testing-frameworks@02eba0f) Add explicit test scope to AssertJ dependency additions ([#903](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/issues/903)) * [`4e79908`](openrewrite/rewrite-testing-frameworks@4e79908) Handle method references in JUnit Assert to Assertions migration. ([#901](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/issues/901)) * [`35409b0`](openrewrite/rewrite-testing-frameworks@35409b0) Make declarative recipes singletons ([#905](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/issues/905)) * Additional commits viewable in [compare view](openrewrite/rewrite-testing-frameworks@v3.26.0...v3.27.0) [](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`. 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What's changed?
Added support for converting JUnit 4
Assertmethod references to JUnit 5Assertionsmethod references in theAssertToAssertionsrecipe.Before this change, method invocations like
Assert.assertTrue(true)were converted correctly, but method references likeStream.of(true, true).forEach(Assert::assertTrue)were not being transformed.The fix adds a
visitMemberReferencemethod toAssertToAssertionsVisitorthat handles the conversion of method references.What's your motivation?
Method references are commonly used with streams and functional interfaces. Without this fix, code using patterns like
list.forEach(Assert::assertNotNull)would not be migrated, leaving behind JUnit 4 dependencies after runningJUnit4to5Migration.Anything in particular you'd like reviewers to focus on?
Anyone you would like to review specifically?
Have you considered any alternatives or workarounds?
Any additional context
The
assertThatmethod is explicitly excluded from conversion (consistent with the method invocation handling) since it's handled separately for Hamcrest/AssertJ migration.Checklist