Tests with a shared driver

tests/test_shared_driver.py

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+""" This module contains an example of a shared, global driver.
+
+😱 Be careful with this!
+Sharing data and state between tests can have them "tripping" over each other
+and affect each other's outcome which is probably not what you want.
+
+😬 Also, don't have test function 3️⃣ be dependent on test function 2️⃣ which is dependent on 1️⃣
+1️⃣ > 2️⃣ > 3️⃣
+
+> This removes their ability to be executed in parallel because you've forced a sequential flow
+
+Instead:
+🚘 Each test should get its own instance of a driver (and any objects dependent on a driver like Page Objects)
+🔀 Tests should be independent of each other
+🤏 Tests should be as modular as possible, but do what makes sense for you!
+💡 Tests should manage their own data and state (but that's for a different course)
+
+Following these guidelines will enable you to run all your tests in parallel!
+"""
+import time
+from typing import List
+from selenium import webdriver
+from selenium.webdriver.chrome.webdriver import WebDriver
+from selenium.webdriver.remote.webelement import WebElement
+from webdriver_manager.chrome import ChromeDriverManager
+
+
+class TodoPage:
+    def __init__(self, driver: WebDriver):
+        self.driver = driver
+
+    def goto(self) -> 'TodoPage':
+        self.driver.get('https://lambdatest.github.io/sample-todo-app/')
+        return self
+
+    def get_all_todos(self) -> List[WebElement]:
+        return self.driver.find_elements_by_css_selector("li[ng-repeat*='todo'] > input")
+
+    def add_todo(self, name: str) -> 'TodoPage':
+        self.driver.find_element_by_id('sampletodotext').send_keys(name)
+        self.driver.find_element_by_id('addbutton').click()
+        return self
+
+
+""" 😅 Shared, global driver. """
+driver = webdriver.Chrome(ChromeDriverManager().install())
+page = TodoPage(driver).goto()
+
+
+def test_add_new_item():
+    page.add_todo(name='Make tests independent')
+    time.sleep(5)  # DEMO: simulate more complicated flow
+    todos = page.get_all_todos()
+    assert len(todos) == 6
+
+
+def test_add_blank_item():
+    time.sleep(3)  # DEMO: simulate more complicated flow
+    page.add_todo(name='')
+    todos = page.get_all_todos()
+    assert len(todos) == 6
+
+
+def test_add_two_items():
+    page.add_todo(name='Watch module 3')
+    page.add_todo(name='Watch module 4')
+    todos = page.get_all_todos()
+    assert len(todos) == 7