test: migrate datasketches extension tests to JUnit 5 by FrankChen021 · Pull Request #19881 · apache/druid

FrankChen021 · 2026-08-04T15:18:59Z

Description

Migrates the extensions-core/datasketches test suite from JUnit 4 to JUnit 5.

This is Batch 7 of the extensions-core migration and is part of #13948.

Depends on the earlier migration batches in #19875, #19876, #19877, #19878, #19879, and #19880.

The migration replaces JUnit 4 assertions, lifecycle methods, and temporary-folder rules with Jupiter equivalents. The shared AggregationTestHelper supports the migrated @TempDir callers while retaining its legacy overload for the remaining migration work.

Tests

mvn -ntp test -pl extensions-core/datasketches -am \
  -Dtest='org.apache.druid.query.aggregation.datasketches.**,org.apache.druid.segment.DatasketchesProjectionTest' \
  -Dsurefire.failIfNoSpecifiedTests=false \
  -Pskip-static-checks -Dweb.console.skip=true -T1C

Result: 1,049 tests passed; 0 failures, errors, or skips.

FrankChen021

I have reviewed the code for correctness, edge cases, concurrency, and integration risks; no issues found.

Reviewed 80 of 80 changed files.

This is an automated review by Codex GPT-5.6-Sol

FrankChen021

I have reviewed the updated code for correctness, edge cases, concurrency, and integration risks; no issues found.

Reviewed 80 of 80 changed files. The shared temporary-folder helper update preserves both legacy and Jupiter callers.

This is an automated review by Codex GPT-5.6-Sol

FrankChen021 · 2026-08-04T19:40:06Z

Fixed in 690542e: removed the unnecessary throws IOException declaration and import from BaseSketchBuildSegmentMetadataQueryTest.newFolder(...). Error Prone reported CheckedExceptionNotThrown during strict compilation because FileUtils.createTempDirInLocation(...) does not throw a checked exception. Targeted strict compilation for extensions-core/datasketches and its required modules passed with BUILD SUCCESS.

Copilot

Pull request overview

This PR migrates the extensions-core/datasketches module’s test suite from JUnit 4 to JUnit 5 (Jupiter), updating assertions, parameterized tests, and temp-directory handling. It also extends the shared processing test-jar AggregationTestHelper to support JUnit 5 @TempDir callers while keeping JUnit 4 compatibility for remaining migrations.

Changes:

Add JUnit 5-friendly temp-directory support to AggregationTestHelper via a provider abstraction and new *WithTempDir factory methods.
Migrate DataSketches extension tests from JUnit 4 APIs (rules, lifecycle annotations, assertions) to JUnit 5 equivalents.
Remove junit-jupiter-migrationsupport and the Vintage engine from the DataSketches module POM, while retaining the JUnit 4 API dependency for compatibility with shared test-jar signatures.

Reviewed changes

Copilot reviewed 80 out of 80 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
processing/src/test/java/org/apache/druid/query/aggregation/AggregationTestHelper.java	Introduces a temp-folder provider and adds `*WithTempDir` helpers for Jupiter `@TempDir`.
extensions-core/datasketches/src/test/java/org/apache/druid/segment/DatasketchesProjectionTest.java	Converts parameterized projections test from JUnit 4 to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/util/ToObjectVectorColumnProcessorFactoryTest.java	Migrates lifecycle + assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/tuple/ArrayOfDoublesSketchTTestPostAggregatorTest.java	Replaces `ExpectedException` with `assertThrows` and JUnit 5 assertions.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/tuple/ArrayOfDoublesSketchToVariancesPostAggregatorTest.java	JUnit 5 migration (`assertThrows`, assertions).
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/tuple/ArrayOfDoublesSketchToStringPostAggregatorTest.java	JUnit 5 migration (`assertThrows`, assertions).
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/tuple/ArrayOfDoublesSketchToQuantilesSketchPostAggregatorTest.java	Migrates assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/tuple/ArrayOfDoublesSketchToNumEntriesPostAggregatorTest.java	Migrates assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/tuple/ArrayOfDoublesSketchToMetricsSumEstimatePostAggregatorTest.java	Migrates assertions / `assertThrows` to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/tuple/ArrayOfDoublesSketchToMeansPostAggregatorTest.java	JUnit 5 migration (`assertThrows`, assertions).
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/tuple/ArrayOfDoublesSketchToEstimatePostAggregatorTest.java	Migrates assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/tuple/ArrayOfDoublesSketchToEstimateAndBoundsPostAggregatorTest.java	JUnit 5 migration (`assertThrows`, assertions).
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/tuple/ArrayOfDoublesSketchToBase64StringPostAggregatorTest.java	Migrates assertions / `assertThrows` to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/tuple/ArrayOfDoublesSketchSetOpPostAggregatorTest.java	JUnit 5 migration (`assertThrows`, assertions).
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/tuple/ArrayOfDoublesSketchOperationsTest.java	Migrates assertions / `assertThrows` to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/tuple/ArrayOfDoublesSketchObjectStrategyTest.java	Migrates assertions / `assertThrows` to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/tuple/ArrayOfDoublesSketchConstantPostAggregatorTest.java	Migrates assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/tuple/ArrayOfDoublesSketchAggregatorFactoryTest.java	Migrates assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/theta/ThetaSketchBuildSegmentMetadataQueryTest.java	Migrates segment metadata assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/theta/sql/ThetaSketchSqlAggregatorTest.java	Migrates assertions/`assertThrows` to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/theta/SketchToStringPostAggregatorTest.java	Migrates assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/theta/SketchSetPostAggregatorTest.java	JUnit 5 migration (`assertThrows`, assertions).
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/theta/SketchHolderTest.java	Migrates assertions/`assertThrows` to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/theta/SketchHolderObjectStrategyTest.java	Migrates assertions/`assertThrows` to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/theta/SketchEstimateWithErrorBoundsTest.java	Migrates serde test assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/theta/SketchAggregatorFactoryTest.java	Migrates lifecycle + assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/theta/SketchAggregationWithSimpleDataTest.java	Converts parameterized ingestion/query tests to JUnit 5 + `@TempDir`.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/theta/oldapi/OldApiSketchAggregationTest.java	Converts old-API aggregation parameterized tests to JUnit 5 + `@TempDir`.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/theta/BufferHashGrouperUsingSketchMergeAggregatorFactoryTest.java	Migrates assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/quantiles/sql/DoublesSketchSqlAggregatorTest.java	Migrates assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/quantiles/DoublesSketchToStringPostAggregatorTest.java	JUnit 5 migration (`assertThrows`, assertions).
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/quantiles/DoublesSketchToRankPostAggregatorTest.java	Migrates assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/quantiles/DoublesSketchToQuantilesPostAggregatorTest.java	JUnit 5 migration (`assertThrows`, assertions).
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/quantiles/DoublesSketchToQuantilePostAggregatorTest.java	Migrates assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/quantiles/DoublesSketchToHistogramPostAggregatorTest.java	JUnit 5 migration (`assertThrows`, assertions).
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/quantiles/DoublesSketchToCDFPostAggregatorTest.java	JUnit 5 migration (`assertThrows`, assertions).
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/quantiles/DoublesSketchOperationsTest.java	Migrates assertions/`assertThrows` to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/quantiles/DoublesSketchMergeAggregatorFactoryTest.java	Migrates assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/quantiles/DoublesSketchComplexMetricSerdeTest.java	Migrates assertions/`assertThrows` to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/quantiles/DoublesSketchAggregatorFactoryTest.java	Migrates assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/kll/KllFloatsSketchToStringPostAggregatorTest.java	JUnit 5 migration (`assertThrows`, assertions).
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/kll/KllFloatsSketchToRankPostAggregatorTest.java	Migrates assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/kll/KllFloatsSketchToQuantilesPostAggregatorTest.java	JUnit 5 migration (`assertThrows`, assertions).
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/kll/KllFloatsSketchToQuantilePostAggregatorTest.java	Migrates assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/kll/KllFloatsSketchToHistogramPostAggregatorTest.java	JUnit 5 migration (`assertThrows`, assertions).
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/kll/KllFloatsSketchToCDFPostAggregatorTest.java	JUnit 5 migration (`assertThrows`, assertions).
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/kll/KllFloatsSketchOperationsTest.java	Migrates assertions/`assertThrows` to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/kll/KllFloatsSketchMergeAggregatorFactoryTest.java	Migrates assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/kll/KllFloatsSketchComplexMetricSerdeTest.java	Migrates assertions/`assertThrows` to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/kll/KllFloatsSketchAggregatorFactoryTest.java	Migrates assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/kll/KllDoublesSketchToStringPostAggregatorTest.java	JUnit 5 migration (`assertThrows`, assertions).
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/kll/KllDoublesSketchToRankPostAggregatorTest.java	Migrates assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/kll/KllDoublesSketchToQuantilesPostAggregatorTest.java	JUnit 5 migration (`assertThrows`, assertions).
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/kll/KllDoublesSketchToQuantilePostAggregatorTest.java	Migrates assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/kll/KllDoublesSketchToHistogramPostAggregatorTest.java	JUnit 5 migration (`assertThrows`, assertions).
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/kll/KllDoublesSketchToCDFPostAggregatorTest.java	JUnit 5 migration (`assertThrows`, assertions).
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/kll/KllDoublesSketchOperationsTest.java	Migrates assertions/`assertThrows` to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/kll/KllDoublesSketchMergeAggregatorFactoryTest.java	Migrates assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/kll/KllDoublesSketchComplexMetricSerdeTest.java	Migrates assertions/`assertThrows` to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/kll/KllDoublesSketchAggregatorFactoryTest.java	Migrates assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/hll/sql/HllSketchSqlAggregatorTest.java	Migrates assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/hll/HllSketchUnionPostAggregatorTest.java	Migrates assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/hll/HllSketchToStringPostAggregatorTest.java	Migrates assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/hll/HllSketchToEstimateWithBoundsPostAggregatorTest.java	Migrates assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/hll/HllSketchToEstimatePostAggregatorTest.java	Migrates assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/hll/HllSketchMergeAggregatorFactoryTest.java	Migrates lifecycle + exception tests to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/hll/HllSketchHolderTest.java	Migrates assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/hll/HllSketchHolderObjectStrategyTest.java	Migrates assertions/`assertThrows` to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/hll/HllSketchBuildUtilTest.java	Migrates assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/hll/HllSketchBuildSegmentMetadataQueryTest.java	Migrates assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/hll/HllSketchBuildAggregatorFactoryTest.java	Migrates assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/hll/HllSketchAggregatorFactoryTest.java	Migrates lifecycle + assertions to JUnit 5.
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/BaseSketchBuildSegmentMetadataQueryTest.java	Migrates to JUnit 5 `@TempDir` and assertions; updates temp dir creation.
extensions-core/datasketches/pom.xml	Removes Vintage/migrationsupport; retains JUnit 4 API dependency for shared test-jar signature compatibility.

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FrankChen021 · 2026-08-05T02:52:29Z

    try (
-        final AggregationTestHelper toolchest = AggregationTestHelper.createGroupByQueryAggregationTestHelper(
+        final AggregationTestHelper toolchest = AggregationTestHelper.createGroupByQueryAggregationTestHelperWithTempDir(
            sm.getJacksonModules(),
            config,
            tempFolder


Fixed in commit 6d8055b3f8. I removed the mutable config/vectorize lifecycle state and changed setup to setup(GroupByQueryConfig config), called at the start of each of the four @ParameterizedTest methods. Each parameterized invocation now builds its indexes with its own config after JUnit 5 supplies the parameters; vectorize remains the test method parameter used for the query context.

Validation:

mvn -ntp test -pl extensions-core/datasketches -am -Dtest='org.apache.druid.query.aggregation.datasketches.theta.SketchAggregationWithSimpleDataTest,org.apache.druid.query.aggregation.datasketches.theta.oldapi.OldApiSketchAggregationTest,org.apache.druid.query.aggregation.datasketches.hll.HllSketchMergeAggregatorFactoryTest' -Dsurefire.failIfNoSpecifiedTests=false -Pskip-static-checks -Dweb.console.skip=true -T1C

Result: 86 tests passed, 0 failures/errors/skips. Checkstyle and SpotBugs also passed.

FrankChen021 · 2026-08-05T02:53:06Z

+  @AfterEach
  public void teardown() throws IOException
  {
    helper.close();
  }


Fixed in commit 6d8055b3f8. teardown() now checks helper != null, closes it when initialized, and clears the field afterward. This prevents cleanup from masking an initialization failure and avoids retaining a closed helper.

The focused OldApiSketchAggregationTest run passed all 36 parameterized tests. The combined focused command covered this class and the other two reviewed classes and passed 86 tests; Maven Checkstyle and SpotBugs both reported no violations or errors.

FrankChen021 · 2026-08-05T02:52:37Z

+      HllSketchAggregatorFactory result = (HllSketchAggregatorFactory) targetRound.getMergingFactory(other);
+      Assertions.assertEquals(LG_K, result.getLgK());


Fixed in commit 6d8055b3f8. The unreachable result assignment and assertion were removed from testGetMergingFactoryDifferentStringEncoding; the lambda now only invokes the method expected to throw.

The focused HllSketchMergeAggregatorFactoryTest run passed all 18 tests. The combined focused DataSketches command passed 86 tests, and Maven Checkstyle and SpotBugs passed with 0 violations/errors.

FrankChen021

I have reviewed the updated code for correctness, edge cases, concurrency, and integration risks; no issues found.

Reviewed 80 of 80 changed files. The later commits preserve test-count parity and correctly handle strict-compilation cleanup, parameterized setup ordering, and teardown null safety.

This is an automated review by Codex GPT-5.6-Sol

FrankChen021 added 3 commits August 4, 2026 23:18

test: migrate datasketches extension tests to JUnit 5

a6e7ba8

fix: use approved filesystem test utilities

798ed86

style: format migrated tests

ac7b804

github-actions Bot added the Area - Dependencies label Aug 4, 2026

FrankChen021 commented Aug 4, 2026

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test: preserve lazy aggregation temp folder creation

b356603

FrankChen021 commented Aug 4, 2026

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github-advanced-security AI found potential problems Aug 4, 2026

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Comment thread .../druid/query/aggregation/datasketches/tuple/ArrayOfDoublesSketchSetOpPostAggregatorTest.java Fixed

FrankChen021 added 2 commits August 5, 2026 02:14

test: remove unused exception assertion variable

582433c

fix: satisfy strict compilation for datasketches test

690542e

FrankChen021 mentioned this pull request Aug 4, 2026

JUnit4 to JUnit5 migration #13948

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FrankChen021 marked this pull request as ready for review August 5, 2026 02:33

Copilot AI lite review requested due to automatic review settings August 5, 2026 02:33

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fix: address datasketches migration review comments

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FrankChen021 commented Aug 5, 2026

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GWphua approved these changes Aug 6, 2026

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FrankChen021 merged commit ec95071 into apache:master Aug 6, 2026
44 of 45 checks passed

FrankChen021 deleted the codex/junit5-migration-ext-core-7 branch August 6, 2026 12:44

github-actions Bot added this to the 39.0.0 milestone Aug 6, 2026

This was referenced Aug 6, 2026

test: migrate nine extensions-contrib modules to JUnit 5 #19908

Open

test: migrate second extensions-contrib batch to JUnit 5 #19915

Open

test: migrate third extensions-contrib batch to JUnit 5 #19916

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capistrant mentioned this pull request Aug 7, 2026

minor: fix issue that fails datasketches tests if they run in certain order(s) #19924

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test: migrate datasketches extension tests to JUnit 5 - #19881

test: migrate datasketches extension tests to JUnit 5#19881
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		HllSketchAggregatorFactory result = (HllSketchAggregatorFactory) targetRound.getMergingFactory(other);
		Assertions.assertEquals(LG_K, result.getLgK());

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