Skip test for invalid 3byte UTF-8 sequences

Author: msimacek

graalpython/com.oracle.graal.python.test/src/tests/unittest_tags/test_unicode.txt

@@ -62,6 +62,7 @@
 *graalpython.lib-python.3.test.test_unicode.UnicodeTest.test_hash
 *graalpython.lib-python.3.test.test_unicode.UnicodeTest.test_inplace_rewrites
 *graalpython.lib-python.3.test.test_unicode.UnicodeTest.test_invalid_cb_for_2bytes_seq
+*graalpython.lib-python.3.test.test_unicode.UnicodeTest.test_invalid_cb_for_3bytes_seq
 *graalpython.lib-python.3.test.test_unicode.UnicodeTest.test_invalid_cb_for_4bytes_seq
 *graalpython.lib-python.3.test.test_unicode.UnicodeTest.test_invalid_start_byte
 *graalpython.lib-python.3.test.test_unicode.UnicodeTest.test_isalnum

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

@@ -1919,6 +1919,8 @@ def test_invalid_cb_for_2bytes_seq(self):
             self.assertCorrectUTF8Decoding(bytes.fromhex(seq), res,
                                            'invalid continuation byte')
 
+    # Java UTF-8 Charset reports the whole sequence as invalid
+    @support.impl_detail(graalvm=False)
     def test_invalid_cb_for_3bytes_seq(self):
         """
         Test that an 'invalid continuation byte' error is raised when the