def test_pathInfo(self):
        """
        The C{'PATH_INFO'} key of the C{environ} C{dict} passed to the
        application contains the suffix of the request URI path which is not
        included in the value for the C{'SCRIPT_NAME'} key (RFC 3875, section
        4.1.5).
        """
        assertKeyEmpty = self.environKeyEqual('PATH_INFO', '')

        root = self.render('GET', '1.1', [], [''])
        root.addCallback(self.environKeyEqual('PATH_INFO', '/'))

        emptyChild = self.render('GET', '1.1', [''], [''])
        emptyChild.addCallback(assertKeyEmpty)

        leaf = self.render('GET', '1.1', ['foo'], ['foo'])
        leaf.addCallback(assertKeyEmpty)

        container = self.render('GET', '1.1', ['foo', ''], ['foo', ''])
        container.addCallback(assertKeyEmpty)

        internalLeaf = self.render('GET', '1.1', ['foo'], ['foo', 'bar'])
        internalLeaf.addCallback(self.environKeyEqual('PATH_INFO', '/bar'))

        internalContainer = self.render('GET', '1.1', ['foo'], ['foo', ''])
        internalContainer.addCallback(self.environKeyEqual('PATH_INFO', '/'))

        unencoded = self.render('GET', '1.1', [], ['foo', '/', b'bar\xff'])
        unencoded.addCallback(
            self.environKeyEqual('PATH_INFO', '/foo///bar\xff'))

        return gatherResults([
                root, leaf, container, internalLeaf,
                internalContainer, unencoded])

        The C{'PATH_INFO'} key of the C{environ} C{dict} passed to the
        application contains the suffix of the request URI path which is not
        included in the value for the C{'SCRIPT_NAME'} key (RFC 3875, section
        4.1.5).
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/web/test/test_wsgi.py