Selenium HTMLTestRunner 无法生成测试报告的总结

使用Python ，HTMLTestRunner 生成测试报告时，遇到很奇怪的问题，明明运行的结果，没有任何报错，就是不生成测试报告，纠结好久。google+baidu搜索结果也不满意，最后终于解决，先总结下。

代码示例 

#coding=utf-8
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.support.ui import Select
from selenium.common.exceptions import NoSuchElementException
import unittest, time, re,os
import HTMLTestRunner
class Baidu(unittest.TestCase):
    def setUp(self):
        self.driver = webdriver.Chrome(r'C:UsersuserAppDataLocalGoogleChromeApplicationchromedriver')
        self.driver.implicitly_wait(30)
        self.base_url = "http://www.baidu.com/"
        self.verificationErrors = []
        self.accept_next_alert = True

    def test_baidu_search(self):
        driver = self.driver
        driver.get(self.base_url + "/")
        driver.find_element_by_id("kw").send_keys("selenium webdriver")
        driver.find_element_by_id("su").click()
        time.sleep(2)
        driver.close()

    def tearDown(self):
        self.driver.quit()
        self.assertEqual([], self.verificationErrors)

if __name__ == "__main__":
    testunit = unittest.TestSuite()
    # 将测试用例加入到测试容器中
    testunit.addTest(Baidu("test_baidu_search"))
    # 定义个报告存放路径，支持相对路径
    filename = 'E:\sresult.html'
    fp = open(filename, 'wb')
    # 定义测试报告
    runner=HTMLTestRunner.HTMLTestRunner(
        stream=fp,
        title='baidu',
        description='baidu:'
    )
    # 运行测试用例
    runner.run(testunit)