Test cases for the twisted.python.failure 
module.
| Function | getDivisionFailure | Make a Failureof a divide-by-zero error. | 
| Class | FailureTests | Tests for failure.Failure. | 
| Class | BrokenStr | An exception class the instances of which cannot be presented as strings
via str. | 
| Class | BrokenExceptionMetaclass | A metaclass for an exception type which cannot be presented as a string 
via str. | 
| Class | BrokenExceptionType | The aforementioned exception type which cnanot be presented as a string 
via str. | 
| Class | GetTracebackTests | Tests for Failure.getTraceback. | 
| Class | FindFailureTests | Tests for functionality related to Failure._findFailure. | 
| Class | FormattableTracebackTests | Whitebox tests that show that failure._Tracebackconstructs objects that can be used bytraceback.extract_tb. | 
| Class | FrameAttributesTests | _Frame objects should possess some basic attributes that qualify them as fake python Frame objects. | 
| Class | DebugModeTests | Failure's debug mode should allow jumping into the debugger. | 
| Class | ExtendedGeneratorTests | Tests failure.Failuresupport for generator features added 
in Python 2.5 |