[rfc][icedtea-web] Refactor initialize/download out of ResourceTracker and add tests

[Jie Kang]

Hello,

The attached patch moves the download/initialize runnable into a separate class named ResourceDownloader. The tests applicable to the new ResourceDownloader have also been moved from ResourceTrackerTest to ResourceDownloaderTest.

As well a number of tests have been added to ResourceDownloaderTest in order to ensure the capabilities of the downloader are maintained.


New tests of note:

testDownloadResource
testDownloadPackGzResource
testDownloadVersionedResource
testDownloadVersionedPackGzResource
testDownloadLocalResourceFails
testDownloadNotExistingResourceFails

There are two cases that I will add in a separate patch:

1 : test redownloading using new setting in TinyHttpdImpl
2 : test download of gzip file (not packgz)

These both need extra work in code outside of ResourceDownloader


How does it look?


Regards,

-- 

Jie Kang
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