Selenium Testing Library
Slenium Testing Library (STL) is a Python library for Selenium inspired by Testing-Library.
Dependencies
- Python 3.6, 3.7, 3.8, 3.9, 3.10
- Selenium > 3.0.0
Installation
pip install selenium-testing-library
Quick Start
from selenium import webdriver
from selenium_testing_library import Screen
driver = webdriver.Chrome()
driver.open('https://google.com/')
screen = Screen(driver)
search_input = screen.find_by_title("Search")
search.send_keys("Dogs")
search_button = screen.find_by_text("Google Search")
search_button.click()
screen.wait_for_stale(search_button)
Finding elements
get_by returns the element matched and throws an exception if zero or more than one elements matched. This is the main function that we should be using to locate elements on a page.
query_by returns the element matched or None if no element matched. It throws and exception if more than 1 elements matched. Mostly used for asserting that an element is not present: assert not screen.query_by_text("not on page").
find_by behaves like get_by, but uses a WebDriverWait to wait until the element is present in the DOM.
get_all_by returns a list of elements matched. It raises an exception if no elements matched.
query_all_by returns a list of elements matched. It returns an empty list when no elements matched.
find_all_by behaves like get_all_by, but uses a WebDriverWait to wait until the elements jare present in the DOM.
Examples:
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium_testing_library import Screen
screen = Screen(webdriver.Chrome())
screen.query_by((By.ID, "my_id")) # you can use regular tuples as if you were using Selenium's find_element()
screen.find_by((By.XPATH, "//div"), timeout=5, poll_frequency=0.5) # locators for searching through text also work
screen.get_by((By.CSS, ".my_class")) # Will throw an exception if the element is not found
For a more detail description check out the Testing-Library's documentation.
Helper functions
get_by_role(role_name) Queries for elements by given role. Does not currently support default roles. get_by_label_text(text) Queries for label elements that match the the text string and returns the corresponding input element. get_by_placeholder_text(text) Queries elements with the matching placeholder attribute. get_by_text(text) Queries elements where the content matches the provided text. get_by_display_value(value) Queries inputs, textareas, or selects with matching display value. get_by_alt_text(text) Queries elements with the matching alt attribute. get_by_title(text) Queries elements with the matching title attribute. get_by_test_id(value) Queries elements matching the data-testid value. get_by_css(css) Queries elements matching the specified css selector. get_by_xpath(xpath) Queries elements matching the specified xpath selector.
Examples:
from selenium import webdriver
from selenium_testing_library import Screen
screen = Screen(webdriver.Chrome())
screen.query_by_role("role_name")
screen.get_by_label_text("label text")
screen.find_all_by_text("my text", timeout=5, poll_frequency=0.5)
screen.get_all_by_alt_text("alt text")
Locators
Locators are utility classes that simplify writing (By.XXX, selector) tuples. They can be used even when using native selenium functions driver.find_element(locators.Id("my_id")).
Available locators:
Css, XPath, Id, Name, TagName, LinkText, PartialLinkText, ClassName, Role, Text, PlaceholderText, LabelText, AltText, Title, TestId, DisplayValu
Examples:
from selenium import webdriver
from selenium_testing_library import Screen, locators
screen.query_by(locators.Id("my_id"))
screen.find_by(locators.XPath("//div"), timeout=5, poll_frequency=0.5)
screen.get_by(locators.Css(".my_class"))
screen.get_all_by(locators.Text("my text"))
screen.get_by(locators.LinkText("my link text"))
screen.query_all_by(locators.ClassName("my-class-name"))
Wait functions
wait_for(condition_function) Waits until condition function returns a truthy value. wait_for_stale(element) Waits until the element is removed from the DOM.
Examples:
from selenium import webdriver
from selenium_testing_library import Screen, locators
screen = Screen(webdriver.Chrome())
# Wait for the element to be clickable:
element = screen.get_by_text("Submit")
screen.wait_for(lambda _: element.is_enabled(), timeout=5, poll_frequency=0.5)
# Wait for the element to be removed from the page:
screen.wait_for_stale(element)
Querying within elements
Within(element) Used to limit the query to the children of the provided element
Example:
from selenium import webdriver
from selenium_testing_library import Screen, Within
screen = Screen(webdriver.Chrome())
parent_element = screen.get_by_css(".container")
Within(parent_element).get_by_title("My title inside the container")
Contributing
Setting up a local development environment
git clone https://github.com/anze3db/selenium-testing-library.git && cd selenium-testing-library
poetry install && poetry shell
# Make sure `chromedriver` is in your PATH, download from https://chromedriver.chromium.org/downloads
# run tests:
pytest --selenium-headless
# run tests and display coverage info:
pytest --selenium-headless --cov=selenium_testing_library --cov-report html
# To test on multiple Python versions make sure that py37, py38, py39 are
# installed on your system and available through python3.7, python3.8,
# python3.9. (Use pyenv and add the pyenv shims to your path
# `export PATH=$(pyenv root)/shims:$PATH`). Then run tox:
tox
Releasing a new version
bumpver update --tag-num # Wait and see if the CI is green
poetry build && poetry publish
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