Add JUnit 4 support to AddMockitoExtensionIfAnnotationsUsed#922
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Add JUnit 4 support to AddMockitoExtensionIfAnnotationsUsed#922
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When PowerMock's @RunWith(PowerMockRunner.class) is removed from JUnit 4 tests, mock fields annotated with @mock are never initialized. This adds @RunWith(MockitoJUnitRunner.class) for JUnit 4 tests using Mockito annotations, complementing the existing JUnit 5 @ExtendWith support.
timtebeek
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Feb 28, 2026
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…rom 3.28.0 to 3.29.0 [skip ci] Bumps [org.openrewrite.recipe:rewrite-testing-frameworks](https://github.com/openrewrite/rewrite-testing-frameworks) from 3.28.0 to 3.29.0. Release notes *Sourced from [org.openrewrite.recipe:rewrite-testing-frameworks's releases](https://github.com/openrewrite/rewrite-testing-frameworks/releases).* > 3.29.0 > ------ > > What's Changed > -------------- > > * Detect JUnit version in PowerMockitoMockStaticToMockito by [`@MBoegers`](https://github.com/MBoegers) in [openrewrite/rewrite-testing-frameworks#919](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/pull/919) > * ReplacePowerMockito: ensure mockito-core is added when PowerMock is removed by [`@MBoegers`](https://github.com/MBoegers) in [openrewrite/rewrite-testing-frameworks#920](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/pull/920) > * Remove all remaining PowerMock dependencies in ReplacePowerMockito recipe by [`@steve-aom-elliott`](https://github.com/steve-aom-elliott) in [openrewrite/rewrite-testing-frameworks#921](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/pull/921) > * Add JUnit 4 support to AddMockitoExtensionIfAnnotationsUsed by [`@bmuschko`](https://github.com/bmuschko) in [openrewrite/rewrite-testing-frameworks#922](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/pull/922) > * Use mockito-inline instead of mockito-core where applicable by [`@bmuschko`](https://github.com/bmuschko) in [openrewrite/rewrite-testing-frameworks#923](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/pull/923) > * Add recipe to replace MockitoTestExecutionListener by [`@steve-aom-elliott`](https://github.com/steve-aom-elliott) in [openrewrite/rewrite-testing-frameworks#924](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/pull/924) > * Remove empty constructors and suite() methods in MigrateJUnitTestCase by [`@timtebeek`](https://github.com/timtebeek) in [openrewrite/rewrite-testing-frameworks#926](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/pull/926) > > New Contributors > ---------------- > > * [`@bmuschko`](https://github.com/bmuschko) made their first contribution in [openrewrite/rewrite-testing-frameworks#922](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/pull/922) > > **Full Changelog**: <openrewrite/rewrite-testing-frameworks@v3.28.0...v3.29.0> Commits * [`7796693`](openrewrite/rewrite-testing-frameworks@7796693) Remove empty constructors and suite() methods in MigrateJUnitTestCase ([#926](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/issues/926)) * [`5c07d95`](openrewrite/rewrite-testing-frameworks@5c07d95) Add recipe to replace MockitoTestExecutionListener ([#924](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/issues/924)) * [`f1b202d`](openrewrite/rewrite-testing-frameworks@f1b202d) Use mockito-inline instead of mockito-core where applicable ([#923](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/issues/923)) * [`63820f4`](openrewrite/rewrite-testing-frameworks@63820f4) Add JUnit 4 support to AddMockitoExtensionIfAnnotationsUsed ([#1932](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/issues/1932)) ([#922](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/issues/922)) * [`e8bbdf0`](openrewrite/rewrite-testing-frameworks@e8bbdf0) Remove all remaining PowerMock dependencies in ReplacePowerMockito recipe ([#921](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/issues/921)) * [`0e3d076`](openrewrite/rewrite-testing-frameworks@0e3d076) ReplacePowerMockito: ensure mockito-core is added when PowerMock is removed (... * [`af19fad`](openrewrite/rewrite-testing-frameworks@af19fad) Detect JUnit version in PowerMockitoMockStaticToMockito ([#919](https://redirect.github.com/openrewrite/rewrite-testing-frameworks/issues/919)) * See full diff in [compare view](openrewrite/rewrite-testing-frameworks@v3.28.0...v3.29.0) [](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. 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Summary
Extends
AddMockitoExtensionIfAnnotationsUsedto handle JUnit 4 tests by adding@RunWith(MockitoJUnitRunner.class)when Mockito annotations (@Mock,@Captor,@Spy,@InjectMocks) are presentFixes the issue where PowerMock removal leaves JUnit 4
@Mockfields uninitialized because no runner replacement is addedSkips adding
@RunWithwhen any@RunWithannotation is already present (e.g.,SpringRunner,JUnit4)Closes https://github.com/moderneinc/customer-requests/issues/1932