Issue #29392: Prevent crash when passing invalid arguments into msvcrt module.

1 files changed, 7 insertions, 0 deletions

diff --git a/Lib/test/test_pipes.py b/Lib/test/test_pipes.py
index 6a7b45fb46..ad01d08481 100644
--- a/Lib/test/test_pipes.py
+++ b/Lib/test/test_pipes.py
@@ -2,6 +2,7 @@ import pipes
 import os
 import string
 import unittest
+import shutil
 from test.support import TESTFN, run_unittest, unlink, reap_children
 
 if os.name != 'posix':
@@ -18,6 +19,8 @@ class SimplePipeTests(unittest.TestCase):
             unlink(f)
 
     def testSimplePipe1(self):
+        if shutil.which('tr') is None:
+            self.skipTest('tr is not available')
         t = pipes.Template()
         t.append(s_command, pipes.STDIN_STDOUT)
         f = t.open(TESTFN, 'w')
@@ -27,6 +30,8 @@ class SimplePipeTests(unittest.TestCase):
             self.assertEqual(f.read(), 'HELLO WORLD #1')
 
     def testSimplePipe2(self):
+        if shutil.which('tr') is None:
+            self.skipTest('tr is not available')
         with open(TESTFN, 'w') as f:
             f.write('hello world #2')
         t = pipes.Template()
@@ -36,6 +41,8 @@ class SimplePipeTests(unittest.TestCase):
             self.assertEqual(f.read(), 'HELLO WORLD #2')
 
     def testSimplePipe3(self):
+        if shutil.which('tr') is None:
+            self.skipTest('tr is not available')
         with open(TESTFN, 'w') as f:
             f.write('hello world #2')
         t = pipes.Template()