RFR: 8303920: Avoid calling out to python in DataDescriptorSignatureMissing test [v4]

[Eirik Bjorsnos]

On Fri, 10 Mar 2023 08:28:37 GMT, Eirik Bjorsnos <duke at openjdk.org> wrote:

>> Please review this PR which brings  the DataDescriptorSignatureMissing test back to life.
>> 
>> This test currently calls out to Python to create a test vector ZIP with a Data Descriptor without the recommended but optional signature. The Python dependency has turned out to be very brittle, so the test is currently marked with `@ignore` 
>> 
>> The PR replaces Python callouts with directly creating the test vector ZIP in the test itself. We can then remove the `@ignore`tag and run this useful test automatically.
>
> Eirik Bjorsnos has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Revert change to Google copyright line, add an Oracle copyright line instead.

Nice! I added your assertNotNulls and tested with the off-by-one code which gives me the following:


test DataDescriptorSignatureMissing.shouldParseSignaturelessDescriptor(): failure
java.lang.AssertionError: Zip file is unexpectedly missing second entry expected object to not be null

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PR: https://git.openjdk.org/jdk/pull/12959