improve isolation of test_pending_call_creates_thread_subinterpreter

Author: kumaraditya303

Lib/test/test_capi/test_misc.py

@@ -1995,7 +1995,7 @@ def test_pending_call_creates_thread_subinterpreter(self):
 
         def output():
             time.sleep(1)
-            print("x")
+            print("x", end="")
 
         def callback():
             threading.Thread(target=output).start()
@@ -2016,7 +2016,7 @@ def create_pending_call():
         """
         rc, out, err = assert_python_ok('-c', source)
         self.assertEqual(rc, 0)
-        self.assertEqual(out, b"x\n")
+        self.assertEqual(out, b"x")
         self.assertEqual(err, b"")