Only run extensive subprocess tests if -usubprocess to regrtest is specified. Fixes #1124637
diff --git a/Lib/test/test_subprocess.py b/Lib/test/test_subprocess.py
index e8415cd..efee5b5 100644
--- a/Lib/test/test_subprocess.py
+++ b/Lib/test/test_subprocess.py
@@ -382,9 +382,10 @@
 
     def test_no_leaking(self):
         # Make sure we leak no resources
-        max_handles = 1026 # too much for most UNIX systems
-        if mswindows:
-            max_handles = 65 # a full test is too slow on Windows
+        if test_support.is_resource_enabled("subprocess") and not mswindows:
+            max_handles = 1026 # too much for most UNIX systems
+        else:
+            max_handles = 65 
         for i in range(max_handles):
             p = subprocess.Popen([sys.executable, "-c",
                     "import sys;sys.stdout.write(sys.stdin.read())"],