Update test_long.py and impl "is_integer" for int

Lib/test/test_long.py

@@ -412,8 +412,7 @@ class LongTest(unittest.TestCase):
                "Got {}, expected {}.".format(n, actual, expected))
         self.assertEqual(actual, expected, msg)
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
+    @unittest.expectedFailure # TODO: RUSTPYTHON
     @support.requires_IEEE_754
     def test_float_conversion(self):
 
@@ -824,8 +823,7 @@ class LongTest(unittest.TestCase):
         self.assertEqual(expected, got, "Incorrectly rounded division {}/{}: "
                          "expected {}, got {}".format(a, b, expected, got))
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
+    @unittest.expectedFailure # TODO: RUSTPYTHON
     @support.requires_IEEE_754
     def test_correctly_rounded_true_division(self):
         # more stringent tests than those above, checking that the
@@ -1344,8 +1342,7 @@ class LongTest(unittest.TestCase):
         self.assertEqual((0).to_bytes(1, SubStr('big')), b'\x00')
         self.assertEqual((0).to_bytes(0, SubStr('little')), b'')
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
+    @unittest.expectedFailure # TODO: RUSTPYTHON
     def test_from_bytes(self):
         def check(tests, byteorder, signed=False):
             def equivalent_python(byte_array, byteorder, signed=False):
@@ -1559,6 +1556,11 @@ class LongTest(unittest.TestCase):
             b = i.to_bytes(2, signed=True)
             self.assertIs(int.from_bytes(b, signed=True), i)
 
+    def test_is_integer(self):
+        self.assertTrue((-1).is_integer())
+        self.assertTrue((0).is_integer())
+        self.assertTrue((1).is_integer())
+
     def test_access_to_nonexistent_digit_0(self):
         # http://bugs.python.org/issue14630: A bug in _PyLong_Copy meant that
         # ob_digit[0] was being incorrectly accessed for instances of a
@@ -1602,5 +1604,47 @@ class LongTest(unittest.TestCase):
                 self.assertEqual(n**2,
                     (1 << (2 * bitlen)) - (1 << (bitlen + 1)) + 1)
 
+    @unittest.expectedFailure # TODO: RUSTPYTHON
+    def test___sizeof__(self):
+        self.assertEqual(int.__itemsize__, sys.int_info.sizeof_digit)
+
+        # Pairs (test_value, number of allocated digits)
+        test_values = [
+            # We always allocate space for at least one digit, even for
+            # a value of zero; sys.getsizeof should reflect that.
+            (0, 1),
+            (1, 1),
+            (-1, 1),
+            (BASE-1, 1),
+            (1-BASE, 1),
+            (BASE, 2),
+            (-BASE, 2),
+            (BASE*BASE - 1, 2),
+            (BASE*BASE, 3),
+        ]
+
+        for value, ndigits in test_values:
+            with self.subTest(value):
+                self.assertEqual(
+                    value.__sizeof__(),
+                    int.__basicsize__ + int.__itemsize__ * ndigits
+                )
+
+        # Same test for a subclass of int.
+        class MyInt(int):
+            pass
+
+        self.assertEqual(MyInt.__itemsize__, sys.int_info.sizeof_digit)
+
+        for value, ndigits in test_values:
+            with self.subTest(value):
+                self.assertEqual(
+                    MyInt(value).__sizeof__(),
+                    MyInt.__basicsize__ + MyInt.__itemsize__ * ndigits
+                )
+
+        # GH-117195 -- This shouldn't crash
+        object.__sizeof__(1)
+
 if __name__ == "__main__":
     unittest.main()

vm/src/builtins/int.rs

@@ -686,8 +686,11 @@ impl PyInt {
     }
 
     #[pymethod]
-    /// Returns the number of ones 1 an int. When the number is < 0,
-    /// then it returns the number of ones of the absolute value.
+    const fn is_integer(&self) -> bool {
+        true
+    }
+
+    #[pymethod]
     fn bit_count(&self) -> u32 {
         self.value.iter_u32_digits().map(|n| n.count_ones()).sum()
     }