RETVAL_OK = 0
Test was executed and the result was as expected.
This class talks to end users, asking them annoying questions to get to the ground of where exactly the problem lies.
Its main purpose is to initialise some error messages.
createTemporaryDirectory( purpose = installer, failIsFatal = 1) : mixed|string|int
create a temporary directory and return the location
one of 'installer', 'logo', 'test' defined the purpose of the directory
decides if a creation failure should cause an error; defaults to true
the tuple of: base path, absolute path for directory, directory name