1 files changed, 63 insertions, 0 deletions
diff --git a/tests/run/cclass_assign_attr_GH3100.pyx b/tests/run/cclass_assign_attr_GH3100.pyx
new file mode 100644
index 000000000..331cd901f
--- /dev/null
+++ b/tests/run/cclass_assign_attr_GH3100.pyx
@@ -0,0 +1,63 @@
+cdef extern from *:
+    """
+    #ifdef CYTHON_USE_TYPE_SPECS
+    #define TYPESPECS 1
+    #else
+    #define TYPESPECS 0
+    #endif
+    """
+    int TYPESPECS
+
+cdef class Foo:
+    """
+    >>> D = Foo.__dict__
+    >>> D["meth"] is D["meth2"]
+    True
+    >>> D["classmeth"] is D["classmeth2"]
+    True
+    >>> D["staticmeth"] is D["staticmeth2"]
+    True
+    """
+    def meth(self): pass
+    @classmethod
+    def classmeth(cls): pass
+    @staticmethod
+    def staticmeth(): pass
+
+    meth2 = meth
+    classmeth2 = classmeth
+    staticmeth2 = staticmeth
+
+cdef class ChangeName:
+    # the class seems to need some contents for changing the
+    # name to cause a problem
+    cdef public str attr1
+    cdef public int attr2
+
+if TYPESPECS:
+    __doc__ = """
+    For typespecs, cdef classes are mutable on some Python versions
+    (and it's easiest to leave them that way). Therefore the test
+    is just that reassigning the name doesn't cause a crash
+
+    >>> try:
+    ...     ChangeName.__name__ = "SomethingElse"
+    ... except TypeError:
+    ...     pass  # either type error or changing the name is fine
+    """
+else:
+    __doc__ = """
+    GH-5079
+    Assigning to the cdef class name shouldn't cause a crash.
+    The important bit of this test is the not crashing - it's
+    possible that typespec/limited-API defined classes will be
+    naturally mutable and that isn't a huge problem
+
+    >>> ChangeName.__name__ = "SomethingElse"  # doctest: +ELLIPSIS
+    Traceback (most recent call last):
+        ...
+    TypeError: ...
+    >>> ChangeName.__name__
+    'ChangeName'
+    """
+