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POHow to Mock an HTTP request in a unit testing scenario in Python
 

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  1. POHow to Mock an HTTP request in a unit testing scenario in Python
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    <p>I would like to include a Web server for all my test related to HTTP. It doesn't need to be very sophisticated. I would prefer not to be dependent of being online. So I could test some options of my program. </p> <ol> <li>Start the server </li> <li>Create a few resources (URI) with appropriate mime types, response code, etc.</li> <li>Run the tests (would be good to not have to start the server for each tests too)</li> <li>Shut down the server.</li> </ol> <p>Any hints on this code would be helpful. I tried a few things with BaseHTTPServer but not successful yet. nosetests command seems to wait indefinitely.</p> <pre><code>import unittest from foo import core class HttpRequests(unittest.TestCase): """Tests for HTTP""" def setUp(self): "Starting a Web server" self.port = 8080 # Here we need to start the server # # Then define a couple of URIs and their HTTP headers # so we can test the code. pass def testRequestStyle(self): "Check if we receive a text/css content-type" myreq = core.httpCheck() myuri = 'http://127.0.0.1/style/foo' myua = "Foobar/1.1" self.asserEqual(myreq.mimetype(myuri, myua), "text/css") def testRequestLocation(self): "another test" pass def tearDown(self): "Shutting down the Web server" # here we need to shut down the server pass </code></pre> <p>thanks for any help.</p> <hr> <p><strong>Update - 2012:07:10T02:34:00Z</strong></p> <p>This is a code which for a given Web site will return the list of CSS. I want to test if it returns the right list of CSS.</p> <pre><code>import unittest from foo import core class CssTests(unittest.TestCase): """Tests for CSS requests""" def setUp(self): self.css = core.Css() self.req = core.HttpRequests() def testCssList(self): "For a given Web site, check if we get the right list of linked stylesheets" WebSiteUri = 'http://www.opera.com/' cssUriList = [ 'http://www.opera.com/css/handheld.css', 'http://www.opera.com/css/screen.css', 'http://www.opera.com/css/print.css', 'http://www.opera.com/css/pages/home.css'] content = self.req.getContent(WebSiteUri) cssUriListReq = self.css.getCssUriList(content, WebSiteUri) # we need to compare ordered list. cssUriListReq.sort() cssUriList.sort() self.assertListEqual(cssUriListReq, cssUriList) </code></pre> <p>Then in <code>foo/core.py</code></p> <pre><code>import urlparse import requests from lxml import etree import cssutils class Css: """Grabing All CSS for one given URI""" def getCssUriList(self, htmltext, uri): """Given an htmltext, get the list of linked CSS""" tree = etree.HTML(htmltext) sheets = tree.xpath('//link[@rel="stylesheet"]/@href') for i, sheet in enumerate(sheets): cssurl = urlparse.urljoin(uri, sheet) sheets[i] = cssurl return sheets </code></pre> <p>Right now, the code depends on an online server. It should not. I want to be able to add plenty of different types of combination of stylesheets and to test the protocol and then later on some options on their parsing, combinations, etc.</p>
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    1. COI completely agree with @Rodrigue that starting a web server for unit testing is definitely not a good practice. But if you want to have some functional tests, you may consider using ready solutions such as proxy [WireMock](http://wiremock.org/). It has HTTP API to configure and get requests have been passed through it.
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