[rfc][icedtea-web] Add unit tests for CacheUtil class

[Jie Kang]

Hello,

The patch adds a set of basic unit tests to CacheUtil to make sure they work as intended. They don't cover many edge cases at the moment and are mainly for developer's to read and gain an understanding of the CacheUtil class quicker. Edge cases will be added in the future.

As well, there is one KnownToFail test for CacheUtil.cleanCache : This is due to an implementation error that causes entries marked for deletion to never be deleted in certain circumstances. This will be fixed in a subsequent patch.

Okay to push?


Regards,

-- 

Jie Kang

OpenJDK Team - Software Engineering Intern
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