300: Added Command.max_args instance attribute; added corresponding unit tests

ipalib/public.py

@@ -229,12 +229,15 @@ class Command(plugable.Plugin):
         'options',
         'group_args',
     ))
-    __Option = None
     takes_options = tuple()
     takes_args = tuple()
 
     def __init__(self):
         self.args = plugable.NameSpace(self.__check_args(), sort=False)
+        if len(self.args) == 0 or not self.args[-1].multivalue:
+            self.max_args = len(self.args)
+        else:
+            self.max_args = None
         self.options = plugable.NameSpace(self.__check_options(), sort=False)
         self.params = plugable.NameSpace(
             tuple(self.args()) + tuple(self.options()), sort=False

ipalib/tests/test_public.py

@@ -371,11 +371,6 @@ class test_Command(ClassChecker):
             )
         return example
 
-    def test_class(self):
-        assert self.cls.__bases__ == (plugable.Plugin,)
-        assert self.cls.takes_options == tuple()
-        assert self.cls.takes_args == tuple()
-
     def get_instance(self, args=tuple(), options=tuple()):
         """
         Helper method used to test args and options.
@@ -385,6 +380,11 @@ class test_Command(ClassChecker):
             takes_options = options
         return example()
 
+    def test_class(self):
+        assert self.cls.__bases__ == (plugable.Plugin,)
+        assert self.cls.takes_options == tuple()
+        assert self.cls.takes_args == tuple()
+
     def test_get_args(self):
         """
         Tests the `public.Command.get_args` method.
@@ -436,6 +436,21 @@ class test_Command(ClassChecker):
         e = raises(ValueError, self.get_instance, args=('arg1+', 'arg2'))
         assert str(e) == 'arg2: only final argument can be multivalue'
 
+    def test_max_args(self):
+        """
+        Test the ``Command.max_args`` instance attribute.
+        """
+        o = self.get_instance()
+        assert o.max_args == 0
+        o = self.get_instance(args=('one?',))
+        assert o.max_args == 1
+        o = self.get_instance(args=('one', 'two?'))
+        assert o.max_args == 2
+        o = self.get_instance(args=('one', 'multi+',))
+        assert o.max_args is None
+        o = self.get_instance(args=('one', 'multi*',))
+        assert o.max_args is None
+
     def test_options(self):
         """
         Tests the ``Command.options`` instance attribute.