test_struct: skip tests that require the finalization of the native buffer protocol (for arrays), skip tests that rely on overflowing when sys.maxsize is used over the C / Java boundary

- our sys.maxsize is Integer.MAX_VALUE while cpython uses size_t size

Author: cosminbasca

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

@@ -422,6 +422,7 @@ def test_unpack_from(self):
         self.assertEqual(s.unpack_from(buffer=test_string, offset=2),
                          (b'cd01',))
 
+    @support.impl_detail(msg="not yet supported: GR-21120 array buffer protocol", graalvm=False)
     def test_pack_into(self):
         test_string = b'Reykjavik rocks, eow!'
         writable_buf = array.array('b', b' '*100)
@@ -450,6 +451,7 @@ def test_pack_into(self):
         self.assertRaises((TypeError, struct.error), struct.pack_into, b'', sb,
                           None)
 
+    @support.impl_detail(msg="not yet supported: GR-21120 array buffer protocol", graalvm=False)
     def test_pack_into_fn(self):
         test_string = b'Reykjavik rocks, eow!'
         writable_buf = array.array('b', b' '*100)
@@ -473,6 +475,7 @@ def test_pack_into_fn(self):
         self.assertRaises((ValueError, struct.error), pack_into, small_buf, 2,
                           test_string)
 
+    @support.impl_detail(msg="not yet supported: GR-21120 array buffer protocol", graalvm=False)
     def test_unpack_with_buffer(self):
         # SF bug 1563759: struct.unpack doesn't support buffer protocol objects
         data1 = array.array('B', b'\x12\x34\x56\x78')
@@ -525,6 +528,8 @@ def __bool__(self):
         for c in [b'\x01', b'\x7f', b'\xff', b'\x0f', b'\xf0']:
             self.assertTrue(struct.unpack('>?', c)[0])
 
+    @support.impl_detail(msg="not yet supported: sys.maxsize difference Java -> C, does not overflow defined as "
+                             "Integer.MAX_VALUE < size_t size", graalvm=False)
     def test_count_overflow(self):
         hugecount = '{}b'.format(sys.maxsize+1)
         self.assertRaises(struct.error, struct.calcsize, hugecount)