Verify amount of arguments passed to Attribute

attr/_make.py

@@ -350,6 +350,8 @@ class Attribute(object):
     ]  # we can't use ``attrs`` so we have to cheat a little.
 
     def __init__(self, **kw):
+        if len(kw) > len(Attribute._attributes):
+            raise TypeError("Too many arguments.")
         try:
             for a in Attribute._attributes:
                 setattr(self, a, kw[a])

tests/test_make.py

@@ -19,7 +19,7 @@ from attr._make import (
 )
 
 
-class TestAttr(object):
+class TestCountingAttr(object):
     """
     Tests for `attr`.
     """
@@ -190,12 +190,21 @@ class TestAttribute(object):
     """
     def test_missing_argument(self):
         """
-        Raises TypeError if an Argument is missing.
+        Raises `TypeError` if an Argument is missing.
         """
         with pytest.raises(TypeError) as e:
-            Attribute(default=NOTHING, factory=NOTHING, validator=None)
+            Attribute(default=NOTHING, validator=None)
         assert ("Missing argument 'name'.",) == e.value.args
 
+    def test_too_many_arguments(self):
+        """
+        Raises `TypeError` if extra arguments are passed.
+        """
+        with pytest.raises(TypeError) as e:
+            Attribute(name="foo", default=NOTHING,
+                      factory=NOTHING, validator=None)
+        assert ("Too many arguments.",) == e.value.args
+
 
 class TestMakeClass(object):
     """