Update example tests

Author: mdmintz

examples/test_download_files.py

@@ -5,6 +5,9 @@
 
 class DownloadTests(BaseCase):
     def test_download_chromedriver_notes(self):
+        if self._multithreaded:
+            self.open_if_not_url("about:blank")
+            self.skip("Skipping test in multi-threaded mode.")
         self.open("https://chromedriver.chromium.org/downloads")
         notes_file = "notes.txt"
         notes_link = (

examples/test_todomvc.py

@@ -4,13 +4,7 @@
 
 
 class TodoMVC(BaseCase):
-    @parameterized.expand(
-        [
-            ["mithril"],
-            ["react"],
-            ["vue"],
-        ]
-    )
+    @parameterized.expand([["jquery"], ["react"], ["vue"]])
     def test_todomvc(self, framework):
         self.open("https://todomvc.com/")
         self.clear_local_storage()

examples/user_agent_test.py

@@ -4,6 +4,9 @@
 
 class UserAgentTests(BaseCase):
     def test_user_agent(self):
+        if self._multithreaded:
+            self.open_if_not_url("about:blank")
+            self.skip("Skipping test in multi-threaded mode.")
         self.open("https://my-user-agent.com/")
         zoom_in = "#ua_string{zoom: 1.8;-moz-transform: scale(1.8);}"
         self.add_css_style(zoom_in)