RFR: 8341399: Add since checker tests to the langtools modules [v2]

[Chen Liang]

On Fri, 1 Nov 2024 15:51:10 GMT, Nizar Benalla <nbenalla at openjdk.org> wrote:

>> Can I get a review for this patch that adds `@since` checker tests to the following modules: java.compiler, jdk.compiler, jdk.javadoc and jdk.jdeps. The initial test for `java.base` has been integrated in [JDK-8331051](https://bugs.openjdk.org/browse/JDK-8331051). 
>> 
>> The jtreg comments are almost the same as the ones for the `java.base` test, only the Bug ID and the module name being passed to the test are different.
>> 
>> I've made a small change to `test/jdk/TEST.groups` to include the new tests.
>> 
>> Here are the emails  [[1](https://mail.openjdk.org/pipermail/jdk-dev/2024-June/009160.html)] [[2](https://mail.openjdk.org/pipermail/jdk-dev/2024-October/009474.html)] in `jdk-dev` describing how the tests work and how to run them.
>> 
>> TIA
>
> Nizar Benalla 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:
> 
>  - remove redundant line
>  - Merge remote-tracking branch 'upstream/master' into since-checks-langtools
>  - fix test summary, add jshell module
>  - Add since checker tests to other modules

Why are some test and the test for java.base in modules subdirectory, while some other jdk. module tests are not? Like `test/jdk/tools/sincechecker/modules/java_compiler/CheckSince_javaCompiler.java` vs `test/jdk/tools/sincechecker/jdk_compiler/CheckSince_jdkCompiler.java` (note `jdk_compiler` is not the a `modules` directory)

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PR Comment: https://git.openjdk.org/jdk/pull/21542#issuecomment-2452292014