nBoolean conditions are true or false
nassertTrue(condition)
nassertFalse(condition)
nObjects are null or non-null
nassertNull(object)
nassertNotNull(object)
nObjects are identical (i.e. two references to
the same object), or
not identical.
nassertSame(expected, actual)
ntrue if: expected ==
actual
nassertNotSame(expected, actual)