Test Driven Development (TDD) for Web Scraping

Summary

I have a Python based web scraping pet project that I'm trying to implement some TDD in, but I quickly run into a problem. The unit tests require an internet connection, as well as downloading of html text. While I understand that the actual parsing can be done with a local file, some methods are used to simply redefine the URL and query the website again. This seems to break some of the best practices for TDD (citation: Clean Code by Robert Martin claims that tests should be runnable in any environment). While this is a Python project, I ran into a similar issue using R for Yahoo Finance scraping, and I'm sure this kind of thing is language agnostic. At the very least, this problem seems to violate a major guideline in TDD, which is that the tests should run fast.

tldr; Are there any best practices for handling network connections in TDD?

Reproducible Example

AbstractScraper.py

from urllib.request import urlopen
from bs4 import BeautifulSoup


class AbstractScraper:

    def __init__(self, url):
        self.url = url
        self.dataDictionary = None

    def makeDataDictionary(self):
        html = urlopen(self.url)
        text = html.read().decode("utf-8")
        soup = BeautifulSoup(text, "lxml")
        self.dataDictionary = {"html": html, "text": text, "soup": soup}

    def writeSoup(self, path):
        with open(path, "w") as outfile:
            outfile.write(self.dataDictionary["soup"].prettify())

TestAbstractScraper.py

import unittest
from http.client import HTTPResponse
from bs4 import BeautifulSoup
from CrackedScrapeProject.scrape.AbstractScraper import AbstractScraper
from io import StringIO


class TestAbstractScraperMethods(unittest.TestCase):

    def setUp(self):
        self.scraper = AbstractScraper("http://ift.tt/1f4Af77")
        self.scraper.makeDataDictionary()

    def test_dataDictionaryContents(self):
        self.assertTrue(isinstance(self.scraper.dataDictionary, dict))
        self.assertTrue(isinstance(self.scraper.dataDictionary["html"], HTTPResponse))
        self.assertTrue(isinstance(self.scraper.dataDictionary["text"], str))
        self.assertTrue(isinstance(self.scraper.dataDictionary["soup"], BeautifulSoup))
        self.assertSetEqual(set(self.scraper.dataDictionary.keys()), set(["text", "soup", "html"]))

    def test_writeSoup(self):
        filePath = "C:/users/athompson/desktop/testFile.html"
        self.scraper.writeSoup(filePath)
        self.writtenData = open(filePath, "r").read()
        self.assertEqual(self.writtenData, self.scraper.dataDictionary["soup"].prettify())

if __name__ == '__main__':
    suite = unittest.TestLoader().loadTestsFromTestCase(TestAbstractScraperMethods)
    unittest.TextTestRunner(verbosity=2).run(suite)