bpo-33073: Rework int.as_integer_ratio() implementation (GH-9303)

* Simplify the C code.
* Simplify tests and make them more strict and robust.
* Add references in the documentation.

1 files changed, 6 insertions, 28 deletions

diff --git a/Lib/test/test_long.py b/Lib/test/test_long.py
index 5b860dd36b..53101b3bad 100644
--- a/Lib/test/test_long.py
+++ b/Lib/test/test_long.py
@@ -3,7 +3,6 @@ from test import support
 
 import sys
 
-import enum
 import random
 import math
 import array
@@ -1354,35 +1353,14 @@ class LongTest(unittest.TestCase):
                 self.assertEqual(type(value >> shift), int)
 
     def test_as_integer_ratio(self):
-        tests = [10, 0, -10, 1]
+        class myint(int):
+            pass
+        tests = [10, 0, -10, 1, sys.maxsize + 1, True, False, myint(42)]
         for value in tests:
             numerator, denominator = value.as_integer_ratio()
-            self.assertEqual((numerator, denominator), (value, 1))
-            self.assertIsInstance(numerator, int)
-            self.assertIsInstance(denominator, int)
-
-    def test_as_integer_ratio_maxint(self):
-        x = sys.maxsize + 1
-        self.assertEqual(x.as_integer_ratio()[0], x)
-
-    def test_as_integer_ratio_bool(self):
-        self.assertEqual(True.as_integer_ratio(), (1, 1))
-        self.assertEqual(False.as_integer_ratio(), (0, 1))
-        self.assertEqual(type(True.as_integer_ratio()[0]), int)
-        self.assertEqual(type(False.as_integer_ratio()[0]), int)
-
-    def test_as_integer_ratio_int_enum(self):
-        class Foo(enum.IntEnum):
-            X = 42
-        self.assertEqual(Foo.X.as_integer_ratio(), (42, 1))
-        self.assertEqual(type(Foo.X.as_integer_ratio()[0]), int)
-
-    def test_as_integer_ratio_int_flag(self):
-        class Foo(enum.IntFlag):
-            R = 1 << 2
-        self.assertEqual(Foo.R.as_integer_ratio(), (4, 1))
-        self.assertEqual(type(Foo.R.as_integer_ratio()[0]), int)
-
+            self.assertEqual((numerator, denominator), (int(value), 1))
+            self.assertEqual(type(numerator), int)
+            self.assertEqual(type(denominator), int)
 
 
 if __name__ == "__main__":