Tests which uses Hsqldb and Derby declars in their datasource.xml file a folder, such as 'tmp/hsqldb' or 'tmp/derby' or 'tmp/other'.

It does not respect the concept of tests encapsulation (RUNTIME-2962). It can theorically causes some concurrency tests to access the same file resources and lead to errors.

How I propose to do it:

• change CocoonTestCase#variableValues(), and add a variable named for instance 'randomStr' which generates a random string
• search 'jdbc:derby' and 'jdbc:hsqldb' in all *.xml files. All resulting datasources*.xml files are concerned
• change 'jdbc:derby:tmp/derby;create=true' into 'jdbc:derby:tmp/derby-${randomStr};create=true'
• change 'jdbc:derby:tmp/other;create=true' into 'jdbc:derby:tmp/other-${randomStr};create=true'
• change 'jdbc:hsqldb:tmp/hsqldb' into jdbc:hsqldb:tmp/hsqldb-${randomStr}'