make an old test from 'broken' directory usable

tests/run/extcmethod.pyx

 # mode: run
 
+
 cdef class Spam:
 
     cdef int tons
@@ -13,14 +14,16 @@ cdef class Spam:
     def lift(self):
         print self.tons
 
+
 cdef class SubSpam(Spam):
 
     cdef void add_tons(self, int x):
         self.tons += 2 * x
 
-def test():
+
+def test_spam():
     """
-    >>> test()
+    >>> test_spam()
     5
     0
     20
@@ -41,3 +44,39 @@ def test():
     ss.lift()
 
     s.lift()
+
+
+cdef class SpamDish:
+    cdef int spam
+
+    cdef void describe(self):
+        print "This dish contains", self.spam, "tons of spam."
+
+
+cdef class FancySpamDish(SpamDish):
+    cdef int lettuce
+
+    cdef void describe(self):
+        print "This dish contains", self.spam, "tons of spam",
+        print "and", self.lettuce, "milligrams of lettuce."
+
+
+cdef void describe_dish(SpamDish d):
+    d.describe()
+
+
+def test_spam_dish():
+    """
+    >>> test_spam_dish()
+    This dish contains 42 tons of spam.
+    This dish contains 88 tons of spam and 5 milligrams of lettuce.
+    """
+    cdef SpamDish s
+    cdef FancySpamDish ss
+    s = SpamDish()
+    s.spam = 42
+    ss = FancySpamDish()
+    ss.spam = 88
+    ss.lettuce = 5
+    describe_dish(s)
+    describe_dish(ss)