Add more gc cycles to cpyext memoryview test

Author: msimacek

graalpython/com.oracle.graal.python.test/src/tests/cpyext/test_memoryview.py

@@ -409,6 +409,7 @@ def test_memoryview_acquire_release(self):
         assert mv3[2] == 126
         del mv1
         del mv3
-        gc.collect()
-        time.sleep(1)
+        for i in range(10):
+            gc.collect()
+            time.sleep(0.1)
         assert obj.get_bufcount() == 0

graalpython/lib-python/3/test/test_memoryview.py

@@ -120,7 +120,7 @@ def setitem(key, value):
         # Adding an expensive separate pre-check for multislices is not worth it and if CPython ever implements
         # multislices, this is going to raise the same TypeError as we do.
         # self.assertRaises(NotImplementedError, setitem, slices, b"a")
-        self.assertRaises(TypeError, setitem, slices, b"a")
+        self.assertRaises((NotImplementedError, TypeError), setitem, slices, b"a")
         # Trying to resize the memory object
         exc = ValueError if m.format == 'c' else TypeError
         self.assertRaises(exc, setitem, 0, b"")