Override existing configuration when using nose in Python in a script

Question

I'm trying to setup Python to execute nose, but only on an existing application I'm developing locally. I don't want nose running around all libraries that are currently installed. I do, however, want nose to discover any tests within the current working directory and child directories.

To start with, all I'm trying to do is make sure that the arguments I'm passing are being used (solved by @need-batchelder below). However, at the moment it looks like the arguments I am passing are being ignored, and global discovery of the tests is occurring (i.e. picking up tests from the python folder too.

From the docs:

     -V, --version
     Output nose version and exit

Running nosetests -V from the command line produces the expected version output:

     nosetests -V
     nosetests-script.py version 1.2.1

However, the following test script starts running every test it can find, including those of libraries installed in the python path and not part of the current working directory , even though it is located in the root of the application:

import nose, os

def main():
    print os.getcwd()
    x=raw_input() #This is just so I can see the output of the cwd before it launches into testing everything it can find.
    result = nose.run(argv=['-V']) 

if __name__ == '__main__':
    main()

Here's what I've tried:

Using nose.main() , x=nose.core.run() , x=nose.run().
Passing the arguments directly to nose.run() and using a list.
Using a nose.cfg file.

Thanks

EDIT: Trying @ned-batchelder 's suggestion allows me to run nose with given arguments, but doesn't allow discovery of tests within the application folders. So if I do that, I can pass arguments but I can't test my application.

Note that this is not a duplicate of stackoverflow.com/questions/7070501/… , as the arguments passed are being overridden. — frackham
– frackham, Commented Dec 9, 2012 at 18:38

Ned Batchelder · Accepted Answer · 2012-12-09 18:41:43Z

5

I believe nose expects argv to be the complete argv, meaning the first element should be the name of the program:

nose.run(argv=['me.py', '-V'])

answered Dec 9, 2012 at 18:41

Ned Batchelder

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4 Comments

frackham Over a year ago

Hmm, just tried your suggestion (on another file, 'main.py', and the traceback shown above.

Ned Batchelder Over a year ago

Your traceback is because you are running inside IDLE. If you run it from the command line, it will work right.

frackham Over a year ago

Thanks, you're right in that this does run correctly from command line, and that now it is accepting arguments. However, by passing a single script (or a list of scripts...) to act on, I lose the ability for nose to discover my tests. What I really need is for nose to execute from the current working directory, with the given config. I'll edit the question to clarify this, but thanks for getting me a bit further on with this.

Ned Batchelder Over a year ago

You misunderstand. Argv's typically start with the name of the running program. Nose expects this, so it ignores argv[0].

dbn · Accepted Answer · 2013-08-22 19:49:26Z

1

Probably, what you want is:

arguments = sys.argv[:1] + my_custom_argument_list + sys.argv[1:]
nose.run(argv=arguments)

This will allow you to use your custom arguments as well as those from the command line that invokes your script. It also address the issue that Ned points out about nose requiring that the first argument point to the script.

edited Aug 22, 2013 at 19:49

answered Jan 17, 2013 at 22:39

dbn

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