Returns the
java.lang.reflect.Method instance for
#testSet_null() so that tests
of
java.util.Collections#checkedCollection(java.util.Collection,Class) can suppress it
with
FeatureSpecificTestSuiteBuilder.suppressing() until
Sun bug 6409434 is fixed.
It's unclear whether nulls were to be permitted or forbidden, but presumably the eventual fix
will be to permit them, as it seems more likely that code would depend on that behavior than on
the other. Thus, we say the bug is in set(), which fails to support null.