Add a simple Shadow DOM / Shadow Root test

Author: mdmintz

examples/shadow_root_test.py

@@ -0,0 +1,14 @@
+from seleniumbase import BaseCase
+
+
+class ShadowRootTest(BaseCase):
+    def test_shadow_root(self):
+        self.open("https://react-shadow.herokuapp.com/Patagonia")
+        self.click("section.weather::shadow div::shadow button")
+        self.assert_element('section.weather::shadow img[alt="Patagonia"]')
+        weather = self.get_text("section.weather::shadow h1")
+        self.post_message(weather)
+        self.click('section.weather::shadow a[href="/Kyoto"]')
+        self.assert_element('section.weather::shadow img[alt="Kyoto"]')
+        weather = self.get_text("section.weather::shadow h1")
+        self.post_message(weather)