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    The problem is that parse_args() is implicitly accessing shared
    global state, sys.argv.&nbsp; You need to refactor your code so that you
    can control what argument list it accesses, as Dan described. You'll
    need to refactor you code down to that call, and pass the arguments
    to it explicitly.<br>
    <br>
    --Ned.<br>
    <br>
    <div class="moz-cite-prefix">On 10/31/2012 2:56 AM, Tim Aerdts
      wrote:<br>
    </div>
    <blockquote
cite="mid:CAL7w2Fj+yeHPq5b0+0X=OG2NJOWD=FhS03W1yQzwTU3jUiWT1w@mail.gmail.com"
      type="cite">Hello Dan,
      <div><br>
      </div>
      <div>Thanks for your reply! However I can not use a custom
        argslist. I am testing some methods and functions that call a
        function get_opts() which parses the options. So I do not do any
        parse_args() calls in my tests or anywhere near it.</div>
      <div><br>
      </div>
      <div>I've more or less solved it by adding&nbsp;</div>
      <div><br>
      </div>
      <div>
        <div>&nbsp; &nbsp; parser.add_option('--with-coverage')</div>
        <div>&nbsp; &nbsp; parser.add_option('--with-xunit')</div>
        <div>&nbsp; &nbsp; parser.add_option('--cover-xml')</div>
        <div>&nbsp; &nbsp; parser.add_option('--verbose')</div>
        <div>&nbsp; &nbsp; parser.add_option('--cover-package')</div>
        <div>&nbsp; &nbsp; parser.add_option('--nocapture')</div>
      </div>
      <div><br>
      </div>
      <div>To the parser, but I am sure this is not the way to go.</div>
      <div><br>
      </div>
      <div>Also my setup of optparse might not be that ideal. Everytime
        I need to get something from the arguments I make a call to
        get_opts() which returns the options from parse_args() so if I
        need something called myval I always do get_opts().myval</div>
      <div><br>
      </div>
      <div>Cheers,</div>
      <div><br>
      </div>
      <div>-Tim</div>
      <div><br>
        <div class="gmail_quote">On Tue, Oct 30, 2012 at 8:45 PM, Dan
          Wandschneider <span dir="ltr">&lt;<a moz-do-not-send="true"
              href="mailto:daniel.wandschneider@schrodinger.com"
              target="_blank">daniel.wandschneider@schrodinger.com</a>&gt;</span>
          wrote:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0
            .8ex;border-left:1px #ccc solid;padding-left:1ex">
            <div>Tim-</div>
            <div>optparse.parse_args() parses all arguments given on the
              command line, so it is probably balking on the commands
              that you gave to Nose. &nbsp;In tests, you should create the
              specific argument list that you want to test, and then
              run&nbsp;parser.parse_args(arglist). &nbsp;For example:</div>
            <div>&nbsp; &nbsp; argslist = ['-h']</div>
            <div>&nbsp; &nbsp; with assertRaises(SystemExit):</div>
            <div>&nbsp; &nbsp; &nbsp; &nbsp; myparser.parse_args(argslist)</div>
            <div><br>
            </div>
            <div>If your parser is wrapped in a function or method, use
              this:</div>
            <div>
              &nbsp; &nbsp; def my_parsing_function(args=None):</div>
            <div>&nbsp; &nbsp; &nbsp; &nbsp; myparser.parse_args(args)</div>
            <div><br>
            </div>
            <div>If args == None, OptParse will use sys.argv, so your
              production code is safe. &nbsp;(Also, if you are writing new
              code, I believe that ArgParse is preferred to OptParse)</div>
            <div><br>
            </div>
            -Dan W.
            <div><a moz-do-not-send="true"
                href="http://www.schrodinger.com/" target="_blank">http://www.schrodinger.com/</a><br>
              <br>
              <div class="gmail_quote">On Tue, Oct 30, 2012 at 12:00 PM,
                <span dir="ltr">&lt;<a moz-do-not-send="true"
                    href="mailto:testing-in-python-request@lists.idyll.org"
                    target="_blank">testing-in-python-request@lists.idyll.org</a>&gt;</span>
                wrote:<br>
                <blockquote class="gmail_quote" style="margin:0 0 0
                  .8ex;border-left:1px #ccc solid;padding-left:1ex">Send
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                  Today's Topics:<br>
                  <br>
                  &nbsp; &nbsp;1. Testing optparse with Nosetests (Tim Aerdts)<br>
                  &nbsp; &nbsp;2. Re: Testing optparse with Nosetests (Tim Aerdts)<br>
                  <br>
                  <br>
                  ---------- Forwarded message ----------<br>
                  From:&nbsp;Tim Aerdts &lt;<a moz-do-not-send="true"
                    href="mailto:fragger123@gmail.com" target="_blank">fragger123@gmail.com</a>&gt;<br>
                  To:&nbsp;<a moz-do-not-send="true"
                    href="mailto:testing-in-python@lists.idyll.org"
                    target="_blank">testing-in-python@lists.idyll.org</a><br>
                  Cc:&nbsp;<br>
                  Date:&nbsp;Tue, 30 Oct 2012 09:42:49 +0100<br>
                  Subject:&nbsp;[TIP] Testing optparse with Nosetests<br>
                  Hello,
                  <div><br>
                  </div>
                  <div>Posting this here because it seems more active
                    then the Nosetests users list.</div>
                  <div>Anyway I am in the process of writing an
                    application which makes use of Optparse. I'm running
                    the tests with Nosetests but I fear these two might
                    be&nbsp;interfering?</div>
                  <div><br>
                  </div>
                  <div>When I run parser.parse_args() anywhere in my
                    code Nosetests bugs out.</div>
                  <div><br>
                  </div>
                  <div>
                    <div>Usage: nosetests [options]</div>
                    <div>nosetests: error: no such option:
                      --with-coverage</div>
                    <div><br>
                    </div>
                    <div>Removing the call to parse_args() and
                      everything runs fine.</div>
                    <div><br>
                    </div>
                    <div>Cheers,</div>
                    <div><br>
                    </div>
                    -- <br>
                    Kind regards,<br>
                    Tim Aerdts<br>
                    <a moz-do-not-send="true" href="http://www.tuimz.nl"
                      target="_blank">http://www.tuimz.nl</a><br>
                  </div>
                  <br>
                  <br>
                  ---------- Forwarded message ----------<br>
                  From:&nbsp;Tim Aerdts &lt;<a moz-do-not-send="true"
                    href="mailto:fragger123@gmail.com" target="_blank">fragger123@gmail.com</a>&gt;<br>
                  To:&nbsp;<a moz-do-not-send="true"
                    href="mailto:testing-in-python@lists.idyll.org"
                    target="_blank">testing-in-python@lists.idyll.org</a><br>
                  Cc:&nbsp;<br>
                  Date:&nbsp;Tue, 30 Oct 2012 11:00:53 +0100<br>
                  Subject:&nbsp;Re: [TIP] Testing optparse with Nosetests<br>
                  Just a follow-up.
                  <div><br>
                  </div>
                  <div>If I add the options that I use with nosetests
                    (--with-coverage --verbose
                    --cover-package=mypackage) to my own optparser it
                    works as expected.</div>
                  <div><br>
                  </div>
                  <div>I don't understand this, and preferably I don't
                    need those dependencies in my main application..</div>
                  <div><br>
                    <div class="gmail_quote">On Tue, Oct 30, 2012 at
                      9:42 AM, Tim Aerdts <span dir="ltr">&lt;<a
                          moz-do-not-send="true"
                          href="mailto:fragger123@gmail.com"
                          target="_blank">fragger123@gmail.com</a>&gt;</span>
                      wrote:<br>
                      <blockquote class="gmail_quote" style="margin:0 0
                        0 .8ex;border-left:1px #ccc
                        solid;padding-left:1ex">
                        Hello,
                        <div><br>
                        </div>
                        <div>Posting this here because it seems more
                          active then the Nosetests users list.</div>
                        <div>Anyway I am in the process of writing an
                          application which makes use of Optparse. I'm
                          running the tests with Nosetests but I fear
                          these two might be&nbsp;interfering?</div>
                        <div><br>
                        </div>
                        <div>When I run parser.parse_args() anywhere in
                          my code Nosetests bugs out.</div>
                        <div><br>
                        </div>
                        <div>
                          <div>Usage: nosetests [options]</div>
                          <div>nosetests: error: no such option:
                            --with-coverage</div>
                          <div><br>
                          </div>
                          <div>Removing the call to parse_args() and
                            everything runs fine.</div>
                          <div><br>
                          </div>
                          <div>Cheers,</div>
                          <span class="HOEnZb"><font color="#888888"><span><font
                                  color="#888888">
                                  <div><br>
                                  </div>
                                  -- <br>
                                  Kind regards,<br>
                                  Tim Aerdts<br>
                                  <a moz-do-not-send="true"
                                    href="http://www.tuimz.nl"
                                    target="_blank">http://www.tuimz.nl</a><br>
                                </font></span></font></span></div>
                        <span class="HOEnZb"><font color="#888888">
                          </font></span></blockquote>
                    </div>
                    <span class="HOEnZb"><font color="#888888"><br>
                        <br clear="all">
                        <div><br>
                        </div>
                        -- <br>
                        Kind regards,<br>
                        Tim Aerdts<br>
                        <a moz-do-not-send="true"
                          href="http://www.tuimz.nl" target="_blank">http://www.tuimz.nl</a><br>
                      </font></span></div>
                  <span class="HOEnZb"><font color="#888888">
                      <br>
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        <br clear="all">
        <div><br>
        </div>
        -- <br>
        Kind regards,<br>
        Tim Aerdts<br>
        <a moz-do-not-send="true" href="http://www.tuimz.nl">http://www.tuimz.nl</a><br>
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