Add a double_click test

Author: mdmintz

examples/test_double_click.py

@@ -0,0 +1,11 @@
+from seleniumbase import BaseCase
+
+
+class MyTestClass(BaseCase):
+
+    def test_double_click(self):
+        self.open("https://www.w3schools.com/jsref"
+                  "/tryit.asp?filename=tryjsref_ondblclick")
+        self.switch_to_frame("iframeResult")
+        self.double_click('[ondblclick="myFunction()"]')
+        self.assert_text("Hello World", "#demo")