Add interpreter checking in the test case.

Author: ZeroIntensity

Lib/test/test_interpreters/test_api.py

@@ -2362,18 +2362,21 @@ def test_set___main___attrs(self):
 
 
 class TestSharedObjectProxy(TestBase):
-    def unshareable(self):
+    def unshareable(self, file=os.devnull):
         class Unshareable:
             def __init__(self):
                 # This prevents the object from being pickleable
-                self.file = open(os.devnull)
+                self.file = open(file, "w+")
 
             def __del__(self):
                 self.file.close()
 
             def foo(self):
                 return 42
 
+            def interp(self):
+                return interpreters.get_current()
+
         obj = Unshareable()
         self.assertFalse(_interpreters.is_shareable(obj))
         self.assertFalse(is_pickleable(obj))
@@ -2384,12 +2387,17 @@ def test_simple_proxy(self):
         try:
             def get_unshareable(obj):
                 assert obj.foo() == 42
+                return 24
+
+            def get_interp(obj):
+                return obj.interp().id
 
             with interpreters.share(self.unshareable()) as proxy:
                 self.assertTrue(_interpreters.is_shareable(proxy))
                 self.assertTrue(sys._is_immortal(proxy))
                 self.assertFalse(is_pickleable(proxy))
-                interp.call(get_unshareable, proxy)
+                self.assertEqual(interp.call(get_unshareable, proxy), 24)
+                self.assertEqual(interp.call(get_interp, proxy), interpreters.get_current().id)
         finally:
             interp.close()