That's actually the first thing I tried. I'm having trouble overriding Test::Class methods when I sub-class (I'm still working on that problem) but even if I localize the module and modify it to put the call in a block with warnings turned off, it still emits warnings. That method still doesn't work even in this simplified example:

{
  no warnings;
  Foo->bar();
}

package Foo;
use warnings;
sub bar{
  print $baz
}
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Or am I doing something wrong here?