created functional_tests.my_lists_page to contain helpers for viewing shared lists; refactored several other FTs to passing

src/functional_tests/my_lists_page.py

@@ -0,0 +1,17 @@
+from selenium.webdriver.common.by import By
+
+
+class MyListsPage:
+    def __init__(self, test):
+        self.test = test
+    
+    def go_to_my_lists_page(self, email):
+        self.test.browser.get(self.test.live_server_url)
+        self.test.browser.find_element(By.LINK_TEXT, "My lists").click()
+        self.test.wait_for(
+            lambda: self.test.assertIn(
+                email,
+                self.test.browser.find_element(By.TAG_NAME, "h2").text,
+            )
+        )
+        return self