#2 change calls for assert to assertTrue

[Paul Viveiros]

Update JXTestIsEqual and JXTestIsNull to use
testCase.assertTrue. In JUnit 3.8 they deleted the
deprecated assert(boolean) in favor of assertTrue
(boolean). This was done because as of JDK
1.4, 'assert' has become a keyword and may not be used
as an identifier.

[Thomas.P.Varghese]

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Thanks Paul for pointing it out.