test: run test on parallel pool

Author: djmaxus

test.m

@@ -1,2 +1,4 @@
-%%
-demo(parfor_arg=0,show_figures=false,show_progress=false);
+if isempty(gcp('nocreate'))
+    parpool('Threads');
+end
+demo(parfor_arg=4,show_figures=false,show_progress=false);