Unskip tests in test_json.test_scanstring

Lib/test/test_json/test_scanstring.py

@@ -86,9 +86,8 @@ class TestScanstring:
             scanstring('["Bad value", truth]', 2, True),
             ('Bad value', 12))
 
-    @unittest.skip("TODO: RUSTPYTHON, "
-        "json.decoder.JSONDecodeError: unpaired surrogate: line 1 column 3 (char 2); "
-        "ValueError: chr() arg not in range(0x110000)")
+    # TODO: RUSTPYTHON
+    @unittest.expectedFailure
     def test_surrogates(self):
         scanstring = self.json.decoder.scanstring
         def assertScan(given, expect):
@@ -105,8 +104,6 @@ class TestScanstring:
         assertScan('"z\ud834\\udd20x"', 'z\ud834\udd20x')
         assertScan('"z\ud834x"', 'z\ud834x')
 
-    @unittest.skip("TODO: RUSTPYTHON, TestCScanstring passes while TestPyScanstring errors: "
-        "ValueError: chr() arg not in range(0x110000)")
     def test_bad_escapes(self):
         scanstring = self.json.decoder.scanstring
         bad_escapes = [
@@ -138,13 +135,18 @@ class TestScanstring:
             with self.assertRaises(self.JSONDecodeError, msg=s):
                 scanstring(s, 1, True)
 
-    @unittest.skip("TODO: RUSTPYTHON, "
-        "TypeError: Expected type 'str', not 'bytes'; "
-        "TypeError: expected string")
+    # TODO: RUSTPYTHON
+    @unittest.expectedFailure
     def test_overflow(self):
         with self.assertRaises(OverflowError):
             self.json.decoder.scanstring(b"xxx", sys.maxsize+1)
 
 
 class TestPyScanstring(TestScanstring, PyTest): pass
+# TODO: RUSTPYTHON
+class TestPyScanstring(TestScanstring, PyTest):
+    # TODO: RUSTPYTHON
+    @unittest.expectedFailure
+    def test_bad_escapes(self):
+        super().test_bad_escapes()
 class TestCScanstring(TestScanstring, CTest): pass