Simpletest debug() not working / Exceptions not showing

[bozzltron]

I upgraded to 6.23 and am in the middle of simpletest development. I am unable to get debug function to work. Plus, the yellow exceptions that used to show up in my test are no longer showing up. I'm am going to test debug() on a fresh install of pressflow.

[bozzltron]

I ran the simpletest test and got the following failures:

Cannot access install.php with a "simpletest" user-agent header.
Found assertion {"Division by zero", "Warning", "Fail", "simpletest.test", "SimpleTestFunctionalTest->stubTest()"}.
Found assertion {"array_key_exists", "Warning", "Fail", "simpletest.test", "SimpleTestFunctionalTest->stubTest()"}.
Found assertion {"Debug: 'Foo'", "Debug", "Fail", "simpletest.test", "SimpleTestFunctionalTest->stubTest()"}.
Stub test summary is correct
Found assertion {"Division by zero", "Warning", "Fail", "simpletest.test", "SimpleTestFunctionalTest->stubTest()"}.
Found assertion {"array_key_exists", "Warning", "Fail", "simpletest.test", "SimpleTestFunctionalTest->stubTest()"}.
Found assertion {"Debug: 'Foo'", "Debug", "Fail", "simpletest.test", "SimpleTestFunctionalTest->stubTest()"}.
Stub test summary is correct

[bozzltron]

Even on a fresh pressflow install I get the preceding errors except the first one. The reason I get it in my other instance is due to install.php being deleted.