Fix tests

Author: Daniel Reigada

src/main/resources/docs/tests/W0221.py

@@ -10,5 +10,5 @@ class Child(Parent):
 
     ##Err: W0221
     def method(self, arg, arg1):
-        return arg, arg1, arg2
+        return arg, arg1
 

src/main/resources/docs/tests/W0222.py

@@ -2,12 +2,12 @@
 
 class Parent(object):
 
-    def method(self, arg, arg=1):
+    def method(self, arg, arg1 = 1):
         return arg
 
 
 class Child(Parent):
 
     ##Err: W0222
     def method(self, arg, arg1):
-        return arg, arg1, arg2
+        return arg, arg1

src/main/resources/docs/tests/W0613.py

@@ -3,5 +3,5 @@
 class Object(object):
 
     ##Info: W0613
-    def method(self, arg, unused_arg):
+    def method(self, arg, arg2):
         return arg * 2

src/main/resources/docs/tests/slots.py

@@ -34,6 +34,7 @@ class SixthGood(object):
 class SeventhGood(object):
     __slots__ = {"a": "b", "c": "d"}
 
+##Err: E0238
 class Bad(object):
     __slots__ = list