add test for using "yield from" in Python on a Cython generator

runtests.py

@@ -329,7 +329,7 @@ VER_DEP_MODULES = {
     (3,1): (_is_py3_before_32, lambda x: x in ['run.pyclass_special_methods',
                                                ]),
     (3,3) : (operator.lt, lambda x: x in ['build.package_compilation',
-                                          'yield_from_py33',
+                                          'run.yield_from_py33',
                                           ]),
     (3,4,0,'beta',3) : (operator.le, lambda x: x in ['run.py34_signature',
                                           ]),

tests/run/yield_from_py33.pyx

+# mode: run
+# tag: generator
+
+def yield_from_gen(values):
+    """
+    >>> def yf(x): yield from x
+    >>> list(yf(yield_from_gen([1, 2, 3, 4])))
+    [1, 2, 3, 4]
+    """
+    for value in values:
+        yield value
+
+
+def yield_from_gen_return(values):
+    """
+    >>> def yf(x): yield from x
+    >>> list(yf(yield_from_gen_return([1, 2, 3, 4])))
+    [1, 2, 3, 4]
+    """
+    for value in values:
+        yield value
+    return 5