test_pipes fails on an android emulator running an x86 system image at API level 21.


root@generic_x86:/data/local/tmp # python -m test -v test_pipes
== CPython 3.6.0a0 (default:f4c6dab59cd8+, May 3 2016, 10:42:45) [GCC 4.9 20140827 (prerelease)]
==   Linux-3.4.67+-i686-with-libc little-endian
==   hash algorithm: fnv 32bit
==   /data/local/tmp/test_python_1927
Testing with flags: sys.flags(debug=0, inspect=0, interactive=0, optimize=0, dont_write_bytecode=0, 
no_user_site=0, no_site=0, ignore_environment=0, verbose=0, bytes_warning=0, quiet=0, hash_randomiza
tion=1, isolated=0)
Run tests sequentially
0:00:00 [1/1] test_pipes
testBadAppendOptions (test.test_pipes.SimplePipeTests) ... ok
testBadOpenMode (test.test_pipes.SimplePipeTests) ... ok
testBadPrependOptions (test.test_pipes.SimplePipeTests) ... ok
testClone (test.test_pipes.SimplePipeTests) ... ok
testEmptyPipeline1 (test.test_pipes.SimplePipeTests) ... ok
testEmptyPipeline2 (test.test_pipes.SimplePipeTests) ... ok
testEmptyPipeline3 (test.test_pipes.SimplePipeTests) ... ok
testReadOpenSink (test.test_pipes.SimplePipeTests) ... ok
testRepr (test.test_pipes.SimplePipeTests) ... ok
testSetDebug (test.test_pipes.SimplePipeTests) ... ok
testSimplePipe1 (test.test_pipes.SimplePipeTests) ... /system/bin/sh: tr: not found
FAIL
testSimplePipe2 (test.test_pipes.SimplePipeTests) ... sh: tr: not found
FAIL
testSimplePipe3 (test.test_pipes.SimplePipeTests) ... /system/bin/sh: tr: not found
FAIL
testWriteOpenSource (test.test_pipes.SimplePipeTests) ... ok

======================================================================
FAIL: testSimplePipe1 (test.test_pipes.SimplePipeTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/sdcard/org.bitbucket.pyona/lib/python3.6/test/test_pipes.py", line 27, in testSimplePipe1
    self.assertEqual(f.read(), 'HELLO WORLD #1')
AssertionError: '' != 'HELLO WORLD #1'
+ HELLO WORLD #1

======================================================================
FAIL: testSimplePipe2 (test.test_pipes.SimplePipeTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/sdcard/org.bitbucket.pyona/lib/python3.6/test/test_pipes.py", line 36, in testSimplePipe2
    self.assertEqual(f.read(), 'HELLO WORLD #2')
AssertionError: '' != 'HELLO WORLD #2'
+ HELLO WORLD #2

======================================================================
FAIL: testSimplePipe3 (test.test_pipes.SimplePipeTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/sdcard/org.bitbucket.pyona/lib/python3.6/test/test_pipes.py", line 45, in testSimplePipe3
    self.assertEqual(f.read(), 'HELLO WORLD #2')
AssertionError: '' != 'HELLO WORLD #2'
+ HELLO WORLD #2

----------------------------------------------------------------------
Ran 14 tests in 0.039s

FAILED (failures=3)
test test_pipes failed
1 test failed:
    test_pipes
Total duration: 0:00:01