Forward port additional tests from 2.7 (issue #14829).

Lib/test/test_bisect.py

@@ -23,6 +23,28 @@
 import bisect as c_bisect
 
 
+class Range(object):
+    """A trivial range()-like object without any integer width limitations."""
+    def __init__(self, start, stop):
+        self.start = start
+        self.stop = stop
+        self.last_insert = None
+
+    def __len__(self):
+        return self.stop - self.start
+
+    def __getitem__(self, idx):
+        n = self.stop - self.start
+        if idx < 0:
+            idx += n
+        if idx >= n:
+            raise IndexError(idx)
+        return self.start + idx
+
+    def insert(self, idx, item):
+        self.last_insert = idx, item
+
+
 class TestBisect(unittest.TestCase):
     module = None
 
@@ -125,9 +147,28 @@ def test_negative_lo(self):
     def test_large_range(self):
         # Issue 13496
         mod = self.module
-        data = range(sys.maxsize-1)
-        self.assertEqual(mod.bisect_left(data, sys.maxsize-3), sys.maxsize-3)
-        self.assertEqual(mod.bisect_right(data, sys.maxsize-3), sys.maxsize-2)
+        n = sys.maxsize
+        data = range(n-1)
+        self.assertEqual(mod.bisect_left(data, n-3), n-3)
+        self.assertEqual(mod.bisect_right(data, n-3), n-2)
+        self.assertEqual(mod.bisect_left(data, n-3, n-10, n), n-3)
+        self.assertEqual(mod.bisect_right(data, n-3, n-10, n), n-2)
+
+    def test_large_pyrange(self):
+        # Same as above, but without C-imposed limits on range() parameters
+        mod = self.module
+        n = sys.maxsize
+        data = Range(0, n-1)
+        self.assertEqual(mod.bisect_left(data, n-3), n-3)
+        self.assertEqual(mod.bisect_right(data, n-3), n-2)
+        self.assertEqual(mod.bisect_left(data, n-3, n-10, n), n-3)
+        self.assertEqual(mod.bisect_right(data, n-3, n-10, n), n-2)
+        x = n - 100
+        mod.insort_left(data, x, x - 50, x + 50)
+        self.assertEqual(data.last_insert, (x, x))
+        x = n - 200
+        mod.insort_right(data, x, x - 50, x + 50)
+        self.assertEqual(data.last_insert, (x + 1, x))
 
     def test_random(self, n=25):
         from random import randrange