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import pipes
import os
import string
import unittest
import shutil
from test.support import run_unittest, reap_children, unix_shell
from test.support.os_helper import TESTFN, unlink
if os.name != 'posix':
raise unittest.SkipTest('pipes module only works on posix')
if not (unix_shell and os.path.exists(unix_shell)):
raise unittest.SkipTest('pipes module requires a shell')
TESTFN2 = TESTFN + "2"
# tr a-z A-Z is not portable, so make the ranges explicit
s_command = 'tr %s %s' % (string.ascii_lowercase, string.ascii_uppercase)
class SimplePipeTests(unittest.TestCase):
def tearDown(self):
for f in (TESTFN, TESTFN2):
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)
with t.open(TESTFN, 'w') as f:
f.write('hello world #1')
with open(TESTFN) as f:
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()
t.append(s_command + ' < $IN > $OUT', pipes.FILEIN_FILEOUT)
t.copy(TESTFN, TESTFN2)
with open(TESTFN2) as f:
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()
t.append(s_command + ' < $IN', pipes.FILEIN_STDOUT)
f = t.open(TESTFN, 'r')
try:
self.assertEqual(f.read(), 'HELLO WORLD #2')
finally:
f.close()
def testEmptyPipeline1(self):
# copy through empty pipe
d = 'empty pipeline test COPY'
with open(TESTFN, 'w') as f:
f.write(d)
with open(TESTFN2, 'w') as f:
f.write('')
t=pipes.Template()
t.copy(TESTFN, TESTFN2)
with open(TESTFN2) as f:
self.assertEqual(f.read(), d)
def testEmptyPipeline2(self):
# read through empty pipe
d = 'empty pipeline test READ'
with open(TESTFN, 'w') as f:
f.write(d)
t=pipes.Template()
f = t.open(TESTFN, 'r')
try:
self.assertEqual(f.read(), d)
finally:
f.close()
def testEmptyPipeline3(self):
# write through empty pipe
d = 'empty pipeline test WRITE'
t = pipes.Template()
with t.open(TESTFN, 'w') as f:
f.write(d)
with open(TESTFN) as f:
self.assertEqual(f.read(), d)
def testRepr(self):
t = pipes.Template()
self.assertEqual(repr(t), "<Template instance, steps=[]>")
t.append('tr a-z A-Z', pipes.STDIN_STDOUT)
self.assertEqual(repr(t),
"<Template instance, steps=[('tr a-z A-Z', '--')]>")
def testSetDebug(self):
t = pipes.Template()
t.debug(False)
self.assertEqual(t.debugging, False)
t.debug(True)
self.assertEqual(t.debugging, True)
def testReadOpenSink(self):
# check calling open('r') on a pipe ending with
# a sink raises ValueError
t = pipes.Template()
t.append('boguscmd', pipes.SINK)
self.assertRaises(ValueError, t.open, 'bogusfile', 'r')
def testWriteOpenSource(self):
# check calling open('w') on a pipe ending with
# a source raises ValueError
t = pipes.Template()
t.prepend('boguscmd', pipes.SOURCE)
self.assertRaises(ValueError, t.open, 'bogusfile', 'w')
def testBadAppendOptions(self):
t = pipes.Template()
# try a non-string command
self.assertRaises(TypeError, t.append, 7, pipes.STDIN_STDOUT)
# try a type that isn't recognized
self.assertRaises(ValueError, t.append, 'boguscmd', 'xx')
# shouldn't be able to append a source
self.assertRaises(ValueError, t.append, 'boguscmd', pipes.SOURCE)
# check appending two sinks
t = pipes.Template()
t.append('boguscmd', pipes.SINK)
self.assertRaises(ValueError, t.append, 'boguscmd', pipes.SINK)
# command needing file input but with no $IN
t = pipes.Template()
self.assertRaises(ValueError, t.append, 'boguscmd $OUT',
pipes.FILEIN_FILEOUT)
t = pipes.Template()
self.assertRaises(ValueError, t.append, 'boguscmd',
pipes.FILEIN_STDOUT)
# command needing file output but with no $OUT
t = pipes.Template()
self.assertRaises(ValueError, t.append, 'boguscmd $IN',
pipes.FILEIN_FILEOUT)
t = pipes.Template()
self.assertRaises(ValueError, t.append, 'boguscmd',
pipes.STDIN_FILEOUT)
def testBadPrependOptions(self):
t = pipes.Template()
# try a non-string command
self.assertRaises(TypeError, t.prepend, 7, pipes.STDIN_STDOUT)
# try a type that isn't recognized
self.assertRaises(ValueError, t.prepend, 'tr a-z A-Z', 'xx')
# shouldn't be able to prepend a sink
self.assertRaises(ValueError, t.prepend, 'boguscmd', pipes.SINK)
# check prepending two sources
t = pipes.Template()
t.prepend('boguscmd', pipes.SOURCE)
self.assertRaises(ValueError, t.prepend, 'boguscmd', pipes.SOURCE)
# command needing file input but with no $IN
t = pipes.Template()
self.assertRaises(ValueError, t.prepend, 'boguscmd $OUT',
pipes.FILEIN_FILEOUT)
t = pipes.Template()
self.assertRaises(ValueError, t.prepend, 'boguscmd',
pipes.FILEIN_STDOUT)
# command needing file output but with no $OUT
t = pipes.Template()
self.assertRaises(ValueError, t.prepend, 'boguscmd $IN',
pipes.FILEIN_FILEOUT)
t = pipes.Template()
self.assertRaises(ValueError, t.prepend, 'boguscmd',
pipes.STDIN_FILEOUT)
def testBadOpenMode(self):
t = pipes.Template()
self.assertRaises(ValueError, t.open, 'bogusfile', 'x')
def testClone(self):
t = pipes.Template()
t.append('tr a-z A-Z', pipes.STDIN_STDOUT)
u = t.clone()
self.assertNotEqual(id(t), id(u))
self.assertEqual(t.steps, u.steps)
self.assertNotEqual(id(t.steps), id(u.steps))
self.assertEqual(t.debugging, u.debugging)
def test_main():
run_unittest(SimplePipeTests)
reap_children()
if __name__ == "__main__":
test_main()
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