in reply to Re^2: Testing test function
in thread Testing test function

Untested: What about
ok(! eval { test_foo(a=>2) ; 1}, 'test_foo() should fail for a=2'); is($@, 'invalid argument', 'expected error');
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Re^4: Testing test function
by sedusedan (Pilgrim) on Sep 27, 2013 at 06:18 UTC
    I'm afraid that wouldn't work, because test_foo() emits TAP as well as uses the same Test::Builder instance (since it uses Test::More also) and will interfere with the test script.