fix tests

Author: bernt-matthias

test/test_type_inference.py

@@ -24,12 +24,12 @@
         ("float", CliFloat, False),
         ("decimal", CliFloat, False),
         ("bool", CliBoolean, False),
-        ("file", CliFile, False),
-        ("path", CliFile, False),
+        ("file", CliFile, None),
+        ("path", CliFile, None),
         ("input file", CliFile, False),
         ("output file", CliFile, True),
-        ("folder", CliDir, False),
-        ("directory", CliDir, False),
+        ("folder", CliDir, None),
+        ("directory", CliDir, None),
         ("output directory", CliDir, True),
     ],
 )