This just ports two minor unit tests improvements. First is to check for an instance of JDatabaseDriver rather than the deprecated JDatabase in the JAdapter unit test (in all other places in our test suite we check for JDatabaseDriver so this makes things consistent).
It also removes a require of the JString package. JString is autoloaded - so this require is completely unnecessary
@wilsonge as we get a ok by travis we can RTC?
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