[crac] RFR: 8364538: [CRaC] Test CRaCIgnoreRestoreIfUnavailable [v2]

[Timofei Pushkin]

On Tue, 5 Aug 2025 06:48:00 GMT, Timofei Pushkin <tpushkin at openjdk.org> wrote:

>> test/jdk/jdk/crac/ignoreRestore/EngineFailureTest.java line 51:
>> 
>>> 49:         // Create an empty image which will pass VM's own checks. It may contain
>>> 50:         // CPU features, for example.
>>> 51:         new CracBuilder().engine(CracEngine.SIMULATE)
>> 
>> OK, this creates the empty directory (or rather one with just features), but what's the point? Just making the 'restore' below fail at a different point of time? If there are two ways of failure, both should be tested.
>
> Yes, if there are no CPU features — that is a different failure.
> 
> Did not want to add a test for that because I am not testing CPU features in this PR, but this particular one should not be hard to implement so I'll add it.

Added  `NoCPUFeaturesTest`

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PR Review Comment: https://git.openjdk.org/crac/pull/255#discussion_r2253364580