2 files changed, 67 insertions, 0 deletions
diff --git a/Lib/test/support.py b/Lib/test/support.py
index 842cda6..3353053 100644
--- a/Lib/test/support.py
+++ b/Lib/test/support.py
@@ -10,6 +10,7 @@ import gc
 import socket
 import sys
 import os
+import re
 import platform
 import shutil
 import warnings
@@ -1056,3 +1057,13 @@ def reap_children():
                     break
             except:
                 break
+
+def strip_python_stderr(stderr):
+    """Strip the stderr of a Python process from potential debug output
+    emitted by the interpreter.
+
+    This will typically be run on the result of the communicate() method
+    of a subprocess.Popen object.
+    """
+    stderr = re.sub(br"\[\d+ refs\]\r?\n?$", b"", stderr).strip()
+    return stderr
diff --git a/Lib/test/test_subprocess.py b/Lib/test/test_subprocess.py
index a633af5..ce3e0c2 100644
--- a/Lib/test/test_subprocess.py
+++ b/Lib/test/test_subprocess.py
@@ -804,6 +804,62 @@ class ProcessTestCase(BaseTestCase):
                              " non-zero with this error:\n%s" %
                              stderr.decode('utf8'))
 
+        def check_close_std_fds(self, fds):
+            # Issue #9905: test that subprocess pipes still work properly with
+            # some standard fds closed
+            stdin = 0
+            newfds = []
+            for a in fds:
+                b = os.dup(a)
+                newfds.append(b)
+                if a == 0:
+                    stdin = b
+            try:
+                for fd in fds:
+                    os.close(fd)
+                out, err = subprocess.Popen([sys.executable, "-c",
+                                  'import sys;'
+                                  'sys.stdout.write("apple");'
+                                  'sys.stdout.flush();'
+                                  'sys.stderr.write("orange")'],
+                           stdin=stdin,
+                           stdout=subprocess.PIPE,
+                           stderr=subprocess.PIPE).communicate()
+                err = support.strip_python_stderr(err)
+                self.assertEqual((out, err), (b'apple', b'orange'))
+            finally:
+                for b, a in zip(newfds, fds):
+                    os.dup2(b, a)
+                for b in newfds:
+                    os.close(b)
+
+        def test_close_fd_0(self):
+            self.check_close_std_fds([0])
+
+        def test_close_fd_1(self):
+            self.check_close_std_fds([1])
+
+        def test_close_fd_2(self):
+            self.check_close_std_fds([2])
+
+        def test_close_fds_0_1(self):
+            self.check_close_std_fds([0, 1])
+
+        def test_close_fds_0_2(self):
+            self.check_close_std_fds([0, 2])
+
+        def test_close_fds_1_2(self):
+            self.check_close_std_fds([1, 2])
+
+        def test_close_fds_0_1_2(self):
+            # Issue #10806: test that subprocess pipes still work properly with
+            # all standard fds closed.
+            self.check_close_std_fds([0, 1, 2])
+
+        def test_surrogates_error_message(self):
+            def prepare():
+                raise ValueError("surrogate:\uDCff")
+
 
     #
     # Windows tests