Test failures when building some XWiki modules on Windows

There are some modules which generate test failures when building on Windows:

xwiki-commons:

• xwiki-commons-crypto-common
• xwiki-commons-crypto-store-filesystem

xwiki-platform:

• xwiki-platform-chart-macro
• xwiki-platform-git
• xwiki-platform-less-css-default
• xwiki-platform-office-viewer
• xwiki-platform-oldcore
• xwiki-platform-store-filesystem
• xwiki-platform-store-serialization
• xwiki-platform-store-transaction
• xwiki-platform-wikistream-instance-oldcore
• xwiki-platform-wikistream-stream-confluencexml
• xwiki-platform-wikistream-stream-xar

xwiki-rendering:

• xwiki-rendering-syntax-event
• xwiki-rendering-syntax-plain
• xwiki-rendering-syntax-tex
• xwiki-rendering-syntax-xwiki20
• xwiki-rendering-wikimodel

For each repo I switched to the 6.1 tag (xwiki-platform-6.1, xwiki-rendering-6.1 etc.) and then did a "mvn clean install". The only project that was built without any test failure was xwiki-enterprise, but I had to add

MAVEN_OPTS="-Xmx1024m -XX:MaxPermSize=128m"

as I was getting a PermGen error every time. I've attached an archive with the details for the failing tests.