from selenium.common.exceptions import NoSuchElementException
from selenium.common.exceptions import NoSuchFrameException
from selenium.common.exceptions import StaleElementReferenceException
from selenium.common.exceptions import WebDriverException
from selenium.common.exceptions import NoAlertPresentException
"""
* Canned "Expected Conditions" which are generally useful within webdriver
* tests.
"""
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
class title_contains(object):
""" An expectation for checking that the title contains a case-sensitive
substring. title is the fragment of title expected
returns True when the title matches, False otherwise
"""
def __init__(self, title):
self.title = title
def __call__(self, driver):
return self.title in driver.title
class presence_of_element_located(object):
""" An expectation for checking that an element is present on the DOM
of a page. This does not necessarily mean that the element is visible.
locator - used to find the element
returns the WebElement once it is located
"""
def __init__(self, locator):
self.locator = locator
def __call__(self, driver):
return _find_element(driver, self.locator)
class visibility_of_element_located(object):
""" An expectation for checking that an element is present on the DOM of a
page and visible. Visibility means that the element is not only displayed
but also has a height and width that is greater than 0.
locator - used to find the element
returns the WebElement once it is located and visible
"""
def __init__(self, locator):
self.locator = locator
def __call__(self, driver):
try:
return _element_if_visible(_find_element(driver, self.locator))
except StaleElementReferenceException:
return False
class visibility_of(object):
""" An expectation for checking that an element, known to be present on the
DOM of a page, is visible. Visibility means that the element is not only
displayed but also has a height and width that is greater than 0.
element is the WebElement
returns the (same) WebElement once it is visible
"""
def __init__(self, element):
self.element = element
def __call__(self, ignored):
return _element_if_visible(self.element)
def _element_if_visible(element, visibility=True):
return element if element.is_displayed() == visibility else False
class presence_of_all_elements_located(object):
""" An expectation for checking that there is at least one element present
on a web page.
locator is used to find the element
returns the list of WebElements once they are located
"""
def __init__(self, locator):
self.locator = locator
def __call__(self, driver):
return _find_elements(driver, self.locator)
class text_to_be_present_in_element(object):
""" An expectation for checking if the given text is present in the
specified element.
locator, text
"""
def __init__(self, locator, text_):
self.locator = locator
self.text = text_
def __call__(self, driver):
try :
element_text = _find_element(driver, self.locator).text
return self.text in element_text
except StaleElementReferenceException:
return False
class text_to_be_present_in_element_value(object):
"""
An expectation for checking if the given text is present in the element's
locator, text
"""
def __init__(self, locator, text_):
self.locator = locator
self.text = text_
def __call__(self, driver):
try:
element_text = _find_element(driver,
self.locator).get_attribute("value")
if element_text:
return self.text in element_text
else:
return False
except StaleElementReferenceException:
return False
class frame_to_be_available_and_switch_to_it(object):
""" An expectation for checking whether the given frame is available to
switch to. If the frame is available it switches the given driver to the
specified frame.
"""
def __init__(self, locator):
self.frame_locator = locator
def __call__(self, driver):
try:
if isinstance(self.frame_locator, tuple):
driver.switch_to.frame(_find_element(driver,
self.frame_locator))
else:
driver.switch_to.frame(self.frame_locator)
return True
except NoSuchFrameException:
return False
class invisibility_of_element_located(object):
""" An Expectation for checking that an element is either invisible or not
present on the DOM.
locator used to find the element
"""
def __init__(self, locator):
self.locator = locator
def __call__(self, driver):
try:
return _element_if_visible(_find_element(driver, self.locator), False)
except (NoSuchElementException, StaleElementReferenceException):
# In the case of NoSuchElement, returns true because the element is
# not present in DOM. The try block checks if the element is present
# but is invisible.
# In the case of StaleElementReference, returns true because stale
# element reference implies that element is no longer visible.
return True
class element_to_be_clickable(object):
""" An Expectation for checking an element is visible and enabled such that
you can click it."""
def __init__(self, locator):
self.locator = locator
def __call__(self, driver):
element = visibility_of_element_located(self.locator)(driver)
if element and element.is_enabled():
return element
else:
return False
class staleness_of(object):
""" Wait until an element is no longer attached to the DOM.
element is the element to wait for.
returns False if the element is still attached to the DOM, true otherwise.
"""
def __init__(self, element):
self.element = element
def __call__(self, ignored):
try:
# Calling any method forces a staleness check
self.element.is_enabled()
return False
except StaleElementReferenceException as expected:
return True
class element_to_be_selected(object):
""" An expectation for checking the selection is selected.
element is WebElement object
"""
def __init__(self, element):
self.element = element
def __call__(self, ignored):
return self.element.is_selected()
class element_located_to_be_selected(object):
"""An expectation for the element to be located is selected.
locator is a tuple of (by, path)"""
def __init__(self, locator):
self.locator = locator
def __call__(self, driver):
return _find_element(driver, self.locator).is_selected()
class element_selection_state_to_be(object):
""" An expectation for checking if the given element is selected.
element is WebElement object
is_selected is a Boolean."
"""
def __init__(self, element, is_selected):
self.element = element
self.is_selected = is_selected
def __call__(self, ignored):
return self.element.is_selected() == self.is_selected
class element_located_selection_state_to_be(object):
""" An expectation to locate an element and check if the selection state
specified is in that state.
locator is a tuple of (by, path)
is_selected is a boolean
"""
def __init__(self, locator, is_selected):
self.locator = locator
self.is_selected = is_selected
def __call__(self, driver):
try:
element = _find_element(driver, self.locator)
return element.is_selected() == self.is_selected
except StaleElementReferenceException:
return False
class alert_is_present(object):
""" Expect an alert to be present."""
def __init__(self):
pass
def __call__(self, driver):
try:
alert = driver.switch_to.alert
alert.text
return alert
except NoAlertPresentException:
return False
def _find_element(driver, by):
"""Looks up an element. Logs and re-raises ``WebDriverException``
if thrown."""
try :
return driver.find_element(*by)
except NoSuchElementException as e:
raise e
except WebDriverException as e:
raise e
def _find_elements(driver, by):
try :
return driver.find_elements(*by)
except WebDriverException as e:
raise e
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