Python pipes 模块，FILEIN_FILEOUT 实例源码

我们从Python开源项目中，提取了以下24个代码示例，用于说明如何使用pipes.FILEIN_FILEOUT。

项目：zippy 作者：securesystemslab | 项目源码 | 文件源码

def testSimplePipe2(self):
        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')

项目：zippy 作者：securesystemslab | 项目源码 | 文件源码

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)

项目：zippy 作者：securesystemslab | 项目源码 | 文件源码

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)

项目：oil 作者：oilshell | 项目源码 | 文件源码

def testSimplePipe2(self):
        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')

项目：oil 作者：oilshell | 项目源码 | 文件源码

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)

项目：oil 作者：oilshell | 项目源码 | 文件源码

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)

项目：python2-tracer 作者：extremecoders-re | 项目源码 | 文件源码

def testSimplePipe2(self):
        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')

项目：python2-tracer 作者：extremecoders-re | 项目源码 | 文件源码

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)

项目：python2-tracer 作者：extremecoders-re | 项目源码 | 文件源码

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)

项目：web_ctp 作者：molebot | 项目源码 | 文件源码

def testSimplePipe2(self):
        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')

项目：web_ctp 作者：molebot | 项目源码 | 文件源码

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)

项目：web_ctp 作者：molebot | 项目源码 | 文件源码

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)

项目：pefile.pypy 作者：cloudtracer | 项目源码 | 文件源码

def testSimplePipe2(self):
        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')

项目：pefile.pypy 作者：cloudtracer | 项目源码 | 文件源码

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)

项目：pefile.pypy 作者：cloudtracer | 项目源码 | 文件源码

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)

项目：ouroboros 作者：pybee | 项目源码 | 文件源码

def testSimplePipe2(self):
        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')

项目：ouroboros 作者：pybee | 项目源码 | 文件源码

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)

项目：ouroboros 作者：pybee | 项目源码 | 文件源码

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)

项目：ndk-python 作者：gittor | 项目源码 | 文件源码

def testSimplePipe2(self):
        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')

项目：ndk-python 作者：gittor | 项目源码 | 文件源码

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)

项目：ndk-python 作者：gittor | 项目源码 | 文件源码

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)

项目：kbe_server 作者：xiaohaoppy | 项目源码 | 文件源码

def testSimplePipe2(self):
        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')

项目：kbe_server 作者：xiaohaoppy | 项目源码 | 文件源码

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)

项目：kbe_server 作者：xiaohaoppy | 项目源码 | 文件源码

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)