userland: native testing

test-user-mode

@@ -8,13 +8,17 @@ import example_properties
 from thread_pool import ThreadPool
 
 class Main(common.TestCliFunction):
-    def __init__(self):
-        super().__init__(
-            description='''\
+    def __init__(self, *args, **kwargs):
+        if not 'description' in kwargs:
+            kwargs['description'] = '''\
 https://github.com/cirosantilli/linux-kernel-module-cheat#user-mode-tests
 TODO: expose all userland relevant ./run args here as well somehow.
-''',
-        )
+'''
+        if not 'defaults' in kwargs:
+            kwargs['defaults'] = {}
+        if not 'userland' in kwargs['defaults']:
+            kwargs['defaults']['userland'] = ''
+        super().__init__(*args, **kwargs)
         self.add_argument(
             'tests',
             nargs='*',