diff -r 811ccdee6f87 Lib/test/test_pipes.py
--- a/Lib/test/test_pipes.py	Wed May 04 09:44:44 2016 +0300
+++ b/Lib/test/test_pipes.py	Wed May 04 22:05:38 2016 +0200
@@ -12,11 +12,16 @@
 # tr a-z A-Z is not portable, so make the ranges explicit
 s_command = 'tr %s %s' % (string.ascii_lowercase, string.ascii_uppercase)
 
+def _tr_exists():
+    return any(os.path.isfile(p) for p in
+        (os.path.join(os.fsencode(dir), b'tr') for dir in os.get_exec_path()))
+
 class SimplePipeTests(unittest.TestCase):
     def tearDown(self):
         for f in (TESTFN, TESTFN2):
             unlink(f)
 
+    @unittest.skipUnless(_tr_exists(), 'tr is not available')
     def testSimplePipe1(self):
         t = pipes.Template()
         t.append(s_command, pipes.STDIN_STDOUT)
@@ -26,6 +31,7 @@
         with open(TESTFN) as f:
             self.assertEqual(f.read(), 'HELLO WORLD #1')
 
+    @unittest.skipUnless(_tr_exists(), 'tr is not available')
     def testSimplePipe2(self):
         with open(TESTFN, 'w') as f:
             f.write('hello world #2')
@@ -35,6 +41,7 @@
         with open(TESTFN2) as f:
             self.assertEqual(f.read(), 'HELLO WORLD #2')
 
+    @unittest.skipUnless(_tr_exists(), 'tr is not available')
     def testSimplePipe3(self):
         with open(TESTFN, 'w') as f:
             f.write('hello world #2')