[3.13] gh-86069: Add more PyNumber_InPlacePower() tests (GH-130111) (GH-130211)

Test it with the third argument.
(cherry picked from commit cfe4103)

Co-authored-by: Serhiy Storchaka <[email protected]>

Author: miss-islington

Lib/test/test_capi/test_number.py

@@ -205,8 +205,9 @@ def test_misc_multiply(self):
         self.assertRaises(MemoryError, inplacemultiply, [1, 2], PY_SSIZE_T_MAX//2 + 1)
 
     def test_misc_power(self):
-        # PyNumber_Power()
+        # PyNumber_Power(), PyNumber_InPlacePower()
         power = _testcapi.number_power
+        inplacepower = _testcapi.number_inplacepower
 
         class HasPow(WithDunder):
             methname = '__pow__'
@@ -216,6 +217,39 @@ class HasPow(WithDunder):
         self.assertRaises(TypeError, power, 4, 11, 1.25)
         self.assertRaises(TypeError, power, 4, 11, HasPow.with_val(NotImplemented))
         self.assertRaises(TypeError, power, 4, 11, object())
+        self.assertEqual(inplacepower(4, 11, 5), pow(4, 11, 5))
+        self.assertRaises(TypeError, inplacepower, 4, 11, 1.25)
+        self.assertRaises(TypeError, inplacepower, 4, 11, object())
+
+        class X:
+            def __pow__(*args):
+                return args
+
+        x = X()
+        self.assertEqual(power(x, 11), (x, 11))
+        self.assertEqual(inplacepower(x, 11), (x, 11))
+        self.assertEqual(power(x, 11, 5), (x, 11, 5))
+        self.assertEqual(inplacepower(x, 11, 5), (x, 11, 5))
+
+        class X:
+            def __rpow__(*args):
+                return args
+
+        x = X()
+        self.assertEqual(power(4, x), (x, 4))
+        self.assertEqual(inplacepower(4, x), (x, 4))
+        # XXX: Three-arg power doesn't use __rpow__.
+        self.assertRaises(TypeError, power, 4, x, 5)
+        self.assertRaises(TypeError, inplacepower, 4, x, 5)
+
+        class X:
+            def __ipow__(*args):
+                return args
+
+        x = X()
+        self.assertEqual(inplacepower(x, 11), (x, 11))
+        # XXX: In-place power doesn't pass the third arg to __ipow__.
+        self.assertEqual(inplacepower(x, 11, 5), (x, 11))
 
     @cpython_only
     def test_rshift_print(self):