RFR: 8366678: Use JUnit in test/langtools/tools/javac [v4]

[Chen Liang]

On Thu, 4 Sep 2025 22:03:14 GMT, Christian Stein <cstein at openjdk.org> wrote:

>> Please review this change to use JUnit in tests of `test/langtools/tools/javac`.
>> 
>> ### Assess Status Quo
>> A local `make test TEST=test/langtools/tools/javac` run before the conversion yields:
>> 
>> Test results: passed: 3,938; excluded: 4; did not match keywords: 2; did not meet platform requirements: 2
>> Framework-based tests: 3043 = 2762 TestNG + 281 JUnit
>> 
>> 
>> ### Perform Automatic Conversion
>> - [junit-convert](
>> https://github.com/lahodaj/netbeans/tree/openjdk-testng-junit-fixes-and-hacks/java/java.openjdk.project/junit-convert)
>> 
>> ### Perform Manual Adjustments
>> 
>> Some of the following adjustments will be integrated into the `junit-convert` tool.
>> 
>> #### Make argument source factory method `static`
>> 
>> Method 'public java.lang.Object[][] org.openjdk.tests.javac.FDTest.caseGenerator()'
>>   must be static: local factory methods must be static
>>   unless the PER_CLASS @testinstance lifecycle mode is used;
>>   external factory methods must always be static.
>> 
>> 
>> #### Make `@AfterAll`-annotated method `static`
>> 
>> [ERROR] @afterall method 'public void org.openjdk.tests.vm.FDSeparateCompilationTest.cleanupCompilerCache()'
>>   must be static unless the test class
>>   is annotated with `@TestInstance(Lifecycle.PER_CLASS)`.
>> 
>> 
>> #### Remove `static` modifier from `@Test`-annotated methods
>> This configuration error should have been detected by JUnit Jupiter and reported via the Discovery
>> Issues API: https://docs.junit.org/current/user-guide/#running-tests-discovery-issues
>> 
>> #### Rename test property to `JUnit.dirs`
>> 
>> package org.junit.jupiter.api does not exist
>> 
>> 
>> #### Add custom test instance factory
>> 
>> Class [FDTests] must declare a single constructor
>> Class [MethodReferenceTestKinds] must declare a single constructor
>> 
>> 
>> ### Results
>> Re-run tests via `make test TEST=test/langtools/tools/javac` after the conversion; yielding:
>> 
>> Test results: passed: 3,939; excluded: 4; did not match keywords: 2; did not meet platform requirements: 2
>> Framework-based tests: 3043 = 0 TestNG + 3043 JUnit
>
> Christian Stein has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:
> 
>  - Restore comment - it is unrelated to the JUnit conversion
>  - Update to use correct library directories
>    
>    See also: https://openjdk.org/jtreg/faq.html#how-do-i-find-the-path-for-the-testng-or-junit-jar-files
>  - 8361950: Set required version to 8+2
>  - 8361950: Update to use jtreg 8

The actual changes look good - unfortunately github does not show the correct ... diff.

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Marked as reviewed by liach (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/27046#pullrequestreview-3187465466