今天正好虫师问到selenium python binding中 support.expected_conditions 的用法,顺手总结了一下,希望对大家有所帮助。
先翻译一下这些方法的用法
title_is
: 判断当前页面的title是否精确等于预期
title_contains
: 判断当前页面的title是否包含预期字符串
presence_of_element_located
: 判断某个元素是否被加到了dom树里,并不代表该元素一定可见
visibility_of_element_located
: 判断某个元素是否可见. 可见代表元素非隐藏,并且元素的宽和高都不等于0
visibility_of
: 跟上面的方法做一样的事情,只是上面的方法要传入locator,这个方法直接传定位到的element就好了
presence_of_all_elements_located
: 判断是否至少有1个元素存在于dom树中。举个例子,如果页面上有n个元素的class都是'column-md-3',那么只要有1个元素存在,这个方法就返回True
text_to_be_present_in_element
: 判断某个元素中的text是否 包含 了预期的字符串
text_to_be_present_in_element_value
: 判断某个元素中的value属性是否 包含 了预期的字符串
frame_to_be_available_and_switch_to_it
: 判断该frame是否可以switch进去,如果可以的话,返回True并且switch进去,否则返回False
invisibility_of_element_located
: 判断某个元素中是否不存在于dom树或不可见
element_to_be_clickable
: 判断某个元素中是否可见并且是enable的,这样的话才叫clickable
staleness_of
: 等某个元素从dom树中移除,注意,这个方法也是返回True或False
element_to_be_selected
: 判断某个元素是否被选中了,一般用在下拉列表
element_selection_state_to_be
: 判断某个元素的选中状态是否符合预期
element_located_selection_state_to_be
: 跟上面的方法作用一样,只是上面的方法传入定位到的element,而这个方法传入locator
alert_is_present
: 判断页面上是否存在alert
例子的代码在 这里 ,并且是可以运行通过的。
#encoding:utf-8 # example of how to use https://github.com/SeleniumHQ/selenium/blob/master/py/selenium/webdriver/support/expected_conditions.py from selenium import webdriver from selenium.webdriver.support import expected_conditions as EC from selenium.webdriver.common.by import By import unittest dr = webdriver.PhantomJS('phantomjs') # dr = webdriver.Firefox() # dr = webdriver.Chrome() url = 'http://www.baidu.com' search_text_field_id = 'kw' dr.get(url) class ECExample(unittest.TestCase): def test_title_is(self): ''' 判断title是否符合预期 ''' title_is_baidu = EC.title_is(u'百度一下,你就知道'') self.assertTrue(title_is_baidu(dr)) def test_titile_contains(self): ''' 判断title是否包含预期字符 ''' title_should_contains_baidu = EC.title_contains(u'百度'') self.assertTrue(title_should_contains_baidu(dr)) def test_presence_of_element_located(self): ''' 判断element是否出现在dom树 ''' locator = (By.ID, search_text_field_id) search_text_field_should_present = EC.visibility_of_element_located(locator) self.assertTrue(search_text_field_should_present(dr)) def test_visibility_of(self): search_text_field = dr.find_element_by_id(search_text_field_id) search_text_field_should_visible = EC.visibility_of(search_text_field) self.assertTrue(search_text_field_should_visible('yes')) def test_text_to_be_present_in_element(self): text_should_present = EC.text_to_be_present_in_element((By.NAME, 'tj_trhao123'), 'hao123') self.assertTrue(text_should_present(dr)) @classmethod def tearDownClass(kls): print 'after all test' dr.quit() print 'quit dr' if __name__ == '__main__': unittest.main()
以title_is为例
class title_is(object): """An expectation for checking the title of a page. title is the expected title, which must be an exact match returns True if the title matches, false otherwise.""" def __init__(self, title): self.title = title def __call__(self, driver): return self.title == driver.title
可以看到 title_is
实际上是1个class,其 __call__
方法被定义成是返回1个bool值。因此,一般的用法就是
# 实例化 the_instance = title_is('expected') # 直接在实例上调用__call__ the_instance(dr) #return True or False