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Handle method references in JUnit Assert to Assertions migration.#901

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timtebeek merged 3 commits intoopenrewrite:mainfrom
motlin:junit-migration-method-references
Jan 30, 2026
Merged

Handle method references in JUnit Assert to Assertions migration.#901
timtebeek merged 3 commits intoopenrewrite:mainfrom
motlin:junit-migration-method-references

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@motlin motlin commented Jan 29, 2026

What's changed?

Added support for converting JUnit 4 Assert method references to JUnit 5 Assertions method references in the AssertToAssertions recipe.

Before this change, method invocations like Assert.assertTrue(true) were converted correctly, but method references like Stream.of(true, true).forEach(Assert::assertTrue) were not being transformed.

The fix adds a visitMemberReference method to AssertToAssertionsVisitor that 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 running JUnit4to5Migration.

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 assertThat method is explicitly excluded from conversion (consistent with the method invocation handling) since it's handled separately for Hamcrest/AssertJ migration.

Checklist

  • I've added unit tests to cover both positive and negative cases
  • I've read and applied the recipe conventions and best practices
  • I've used the IntelliJ IDEA auto-formatter on affected files

@github-project-automation github-project-automation bot moved this to In Progress in OpenRewrite Jan 29, 2026
@motlin motlin force-pushed the junit-migration-method-references branch from 203047e to 4057c4c Compare January 29, 2026 04:15
@motlin motlin force-pushed the junit-migration-method-references branch from 12272a4 to 1b026a0 Compare January 29, 2026 14:54
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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.

@timtebeek timtebeek merged commit 4e79908 into openrewrite:main Jan 30, 2026
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@github-project-automation github-project-automation bot moved this from In Progress to Done in OpenRewrite Jan 30, 2026
@motlin motlin deleted the junit-migration-method-references branch January 30, 2026 04:45
mergify bot added a commit to robfrank/linklift that referenced this pull request Feb 14, 2026
…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)
  
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