add some tests for __dealloc__()

tests/run/exttype_dealloc.pyx

+# mode: run
+# tag: dealloc
+
+import gc
+
+
+test_results = []
+
+
+cdef void add_name(obj):
+    name = type(obj).__name__.rsplit('.', 1)[-1]
+    test_results.append(name)
+
+
+def find_name(exttype):
+    name = exttype.__name__.rsplit('.', 1)[-1]
+    return test_results.count(name)
+
+
+cdef class ExtTypeSimple:
+    """
+    >>> obj = ExtTypeSimple()
+    >>> find_name(ExtTypeSimple)
+    0
+    >>> obj = None
+    >>> _ = gc.collect()
+    >>> find_name(ExtTypeSimple)
+    1
+    """
+    cdef int x
+    def __dealloc__(self):
+        add_name(self)
+        self.x = 0
+
+
+class PySubTypeSimple(ExtTypeSimple):
+    """
+    >>> obj = PySubTypeSimple()
+    >>> find_name(PySubTypeSimple)
+    0
+    >>> obj = None
+    >>> _ = gc.collect()
+    >>> find_name(PySubTypeSimple)
+    1
+    """
+
+
+class PySubTypeDel(ExtTypeSimple):
+    """
+    >>> obj = PySubTypeDel()
+    >>> find_name(PySubTypeDel)
+    0
+    >>> obj = None
+    >>> _ = gc.collect()
+    >>> find_name(PySubTypeDel)
+    2
+    """
+    def __del__(self):
+        add_name(self)
+
+
+cdef class ExtSubTypeObjAttr(ExtTypeSimple):
+    """
+    >>> obj = ExtSubTypeObjAttr()
+    >>> find_name(ExtSubTypeObjAttr)
+    0
+    >>> obj = None
+    >>> _ = gc.collect()
+
+    # both this type and the base class add the same name
+    >>> find_name(ExtSubTypeObjAttr)
+    2
+    """
+    cdef object attr
+    def __dealloc__(self):
+        add_name(self)
+        self.x = 1
+
+
+cdef class ExtTypeRaise:
+    """
+    >>> obj = ExtTypeRaise()
+    >>> find_name(ExtTypeRaise)
+    0
+    >>> obj = None
+    >>> _ = gc.collect()
+    >>> find_name(ExtTypeRaise)
+    1
+    """
+    def __dealloc__(self):
+        add_name(self)
+        raise RuntimeError("HUHU !")
+
+
+class PySubTypeRaise(ExtTypeRaise):
+    """
+    >>> obj = PySubTypeRaise()
+    >>> obj.ref = obj
+    >>> find_name(PySubTypeRaise)
+    0
+    >>> obj = None
+    >>> _ = gc.collect()
+    >>> find_name(PySubTypeRaise)
+    1
+    """
+
+
+cdef class ExtTypeRefCycle:
+    """
+    >>> obj = ExtTypeRefCycle()
+    >>> obj.ref = obj
+    >>> find_name(ExtTypeRefCycle)
+    0
+    >>> obj = None
+    >>> _ = gc.collect()
+    >>> find_name(ExtTypeRefCycle)
+    1
+    """
+    cdef public object ref
+    cdef int x
+    def __dealloc__(self):
+        add_name(self)
+        self.x = 1
+
+
+class PySubTypeRefCycleDel(ExtTypeRefCycle):
+    """
+    >>> obj = PySubTypeRefCycleDel()
+    >>> obj.ref = obj
+    >>> find_name(PySubTypeRefCycleDel)
+    0
+    >>> obj = None
+    >>> _ = gc.collect()
+
+    # no guarantees here ...
+    """
+    def __del__(self):
+        add_name(self)
+
+
+cdef class ExtTypeRefCycleRaise:
+    """
+    >>> obj = ExtTypeRefCycleRaise()
+    >>> obj.ref = obj
+    >>> find_name(ExtTypeRefCycleRaise)
+    0
+    >>> obj = None
+    >>> _ = gc.collect()
+    >>> find_name(ExtTypeRefCycleRaise)
+    1
+    """
+    cdef public object ref
+    def __dealloc__(self):
+        add_name(self)
+        raise RuntimeError("Cleaning up !")
+
+
+class PySubTypeRefCycleRaise(ExtTypeRefCycleRaise):
+    """
+    >>> obj = PySubTypeRefCycleRaise()
+    >>> obj.ref = obj
+    >>> find_name(PySubTypeRefCycleRaise)
+    0
+    >>> obj = None
+    >>> _ = gc.collect()
+    >>> find_name(PySubTypeRefCycleRaise)
+    1
+    """