[test.test_cli] Test mp with a single process (does not work on mac cis)

bob/ip/binseg/test/test_cli.py

@@ -82,7 +82,7 @@ def _check_experiment_stare(caplog, overlay, multiprocess=False):
         if overlay:
             options += ["--overlayed"]
         if multiprocess:
-            options += ["--multiproc-data-loading=2"]
+            options += ["--multiproc-data-loading=1"]
 
         result = runner.invoke(experiment, options)
         _assert_exit_0(result)