Update docker image and add webdriver-manager to browser tests

Author: akksi

.circleci/config.yml

@@ -82,7 +82,7 @@ jobs:
   lint-unit-39: &lint-unit
     working_directory: ~/dash
     docker:
-      - image: cimg/python:3.9-browsers
+      - image: circleci/python:3.9.4-node-browsers
         auth:
           username: dashautomation
           password: $DASH_PAT_DOCKERHUB
@@ -102,6 +102,7 @@ jobs:
           command: |
             python -m venv venv && . venv/bin/activate
             pip install --upgrade pip wheel
+            pip install webdriver-manager
             pip install -e .[ci,dev,testing] --no-cache-dir --progress-bar off
       - run:
           name: 🌸 Python & JS Lint

dash/testing/browser.py

@@ -20,6 +20,10 @@
     MoveTargetOutOfBoundsException,
 )
 
+from webdriver_manager.chrome import ChromeDriverManager
+from webdriver_manager.utils import ChromeType
+from webdriver_manager.firefox import GeckoDriverManager
+
 from dash.testing.wait import text_to_equal, style_to_equal, contains_text, until
 from dash.testing.dash_page import DashPageMixin
 from dash.testing.errors import DashAppLoadingError, BrowserError, TestingTimeoutError
@@ -473,7 +477,11 @@ def _get_chrome(self):
                 desired_capabilities=capabilities,
             )
             if self._remote
-            else webdriver.Chrome(options=options, desired_capabilities=capabilities)
+            else webdriver.Chrome(
+                ChromeDriverManager(chrome_type=ChromeType.GOOGLE).install(),
+                options=options,
+                desired_capabilities=capabilities,
+            )
         )
 
         # https://bugs.chromium.org/p/chromium/issues/detail?id=696481
@@ -516,7 +524,10 @@ def _get_firefox(self):
             )
             if self._remote
             else webdriver.Firefox(
-                firefox_profile=fp, options=options, capabilities=capabilities
+                executable_path=GeckoDriverManager().install(),
+                firefox_profile=fp,
+                options=options,
+                capabilities=capabilities,
             )
         )