Changes between Initial Version and Version 1 of webtest/timeout

Timestamp:

11/29/2013 03:13:25 PM (12 years ago)

Author:

chenyang

Comment:

--

webtest/timeout

@@ +1 @@
+== selenium访问资源timeout时应对方案 ==
+
+当我们selenium访问资源时，可能会网络超时，这个网络超时的原因可能是资源中的依赖的某一资源无法访问，或网络异常。
+[[BR]]
+还有可能是瞬间无法访问,或selenim不够稳定引起的。如果是瞬间无法访问或selenim缺乏健壮性引起的,我们是可以避免因为网络超时引起的测试失败。
+[[BR]]
+为了重现网络超时，我们将超时时间设置短一点，设置5秒,如下：
+{{{
+                ......
+                self.driver.set_page_load_timeout(5)    
+                ......
+}}}
+接下来，我们去访问版块页
+{{{
+                ......
+                driver = self.driver
+                driver.get(self.base_url + self.config["test.forum"])
+                #断言主题管理块
+                self.assertTrue(self.is_element_present(By.CSS_SELECTOR, "div.forum_admin"))
+                ......
+
+}}}
+测试失败，并抛出如下异常信息
+{{{
+Traceback (most recent call last):
+  File "admin_menu_forum.py", line 24, in test_admin_menu
+    driver.get(self.base_url + self.config["test.forum"])
+  File "C:\Python27\lib\site-packages\selenium-2.35.0-py2.7.egg\selenium\webdriver\remote\webdriver.py", line 177,
+t
+    self.execute(Command.GET, {'url': url})
+  File "C:\Python27\lib\site-packages\selenium-2.35.0-py2.7.egg\selenium\webdriver\remote\webdriver.py", line 165,
+ecute
+    self.error_handler.check_response(response)
+  File "C:\Python27\lib\site-packages\selenium-2.35.0-py2.7.egg\selenium\webdriver\remote\errorhandler.py", line 1
+ check_response
+    raise exception_class(message, screen, stacktrace)
+TimeoutException: Message: u'Timed out waiting for page load.' ; Stacktrace:
+    at FirefoxDriver.prototype.get/< (file:///c:/users/pc/appdata/local/temp/tmpnfrz_d/extensions/fxdriver@googlec
+m/components/driver_component.js:8767)
+    at WebLoadingListener/e (file:///c:/users/pc/appdata/local/temp/tmpnfrz_d/extensions/fxdriver@googlecode.com/c
+nts/driver_component.js:3330)
+    at WebLoadingListener/< (file:///c:/users/pc/appdata/local/temp/tmpnfrz_d/extensions/fxdriver@googlecode.com/c
+nts/driver_component.js:3337)
+    at fxdriver.Timer.prototype.setTimeout/<.notify (file:///c:/users/pc/appdata/local/temp/tmpnfrz_d/extensions/f
+r@googlecode.com/components/driver_component.js:396)
+}}}
+一般我们将超时时间设为20秒，如果超时，我们可以让selenium去重试，
+{{{
+        .......
+        def retry_when_timeout(driver, url, times = 3):
+                u''' 访问超时,重试,默认重试3次 '''
+                for i in range(0, times):
+                        try:
+                                print "access %s, times %s" % (url, i+1)
+                                driver.get(url)
+                        except TimeoutException, e:
+                                continue
+                        else:
+                                break
+}}}
+使用示例如下:
+{{{
+        ......
+                driver = self.driver
+                functions.retry_when_timeout(driver,self.base_url + self.config["test.forum"])
+                #断言主题管理块
+                self.assertTrue(self.is_element_present(By.CSS_SELECTOR, "div.forum_admin"))
+        ......
+}}}
+
+
+