#971 Defining the global variable "test" to a non-zero value activates the debugger

[David P. Chassin]

This either a bug or an undocumented "feature". Normally, the global debugger (internally global_debug_mode) is used to enable the debugger. For some reason though, test maps to the same internal global_debug_mode. It was probably meant to map to global_test_mode, but that variable doesn't exist or have any purpose. Test modes are initiated directly using the --test command line option to trigger module tests.