ParaView/Servers/ServerManager/Testing/Python/CMakeLists.txt is modified
to handle specially for PythonFilters.py which tests the Python
programmable filter functionality. The modification adds PythonFilters.py
to the test list, it also makes the ctest system parses the outputs of
PythonFilters.py for regular expression that contains "Error". The reason
for this special behavior is that the programmable filter back end
constructs Python scripts on the fly after it receives input expressions.
If there is any error in the input expressisons, the errors or exceptions
that are caused when the constructed script is run, will not be catched
by the constructing environment. So even the test fail, there is no way
to inform ctest about it since the exception is not catchable. The only
possible way is to let ctest parse the outputs and when it sees anything
containing "Error", assuming that the test failed. Of course, this is not
comprehensive, for example, if "Warning" is thrown, ctest will not detect
it. However, given the constraints, this is the best can be done.