Sort replies by relevance, recency, or likes

Fixes #1336

tests/base.py

@@ -71,6 +71,8 @@ class Conversation(object):
     thread = '.reply'
     tweet = '.timeline-item'
     tweet_text = '.tweet-content'
+    reply_sort = '.reply-sort'
+    reply_sort_active = '.reply-sort-option.active'
 
 
 class Poll(object):

tests/test_reply_sort.py

@@ -0,0 +1,37 @@
+from parameterized import parameterized
+
+from base import BaseTestCase, Conversation
+
+sort_modes = [
+    ['jack/status/20', 'Relevant'],
+    ['jack/status/20?sort=relevance', 'Relevant'],
+    ['jack/status/20?sort=recency', 'Recent'],
+    ['jack/status/20?sort=likes', 'Liked'],
+    ['jack/status/20?sort=garbage', 'Relevant'],
+    ['jack/status/20?sort=%3Cscript%3E', 'Relevant'],
+]
+
+
+class ReplySortTest(BaseTestCase):
+    @parameterized.expand(sort_modes)
+    def test_active_mode(self, page, expected_active):
+        self.open_nitter(page)
+        self.assert_element_visible(Conversation.reply_sort)
+        active = self.get_text(Conversation.reply_sort_active)
+        self.assert_equal(active.strip(), expected_active)
+
+    def test_all_three_options_present(self):
+        self.open_nitter('jack/status/20')
+        options = self.find_elements('.reply-sort-option')
+        labels = [o.text.strip() for o in options]
+        self.assert_equal(labels, ['Relevant', 'Recent', 'Liked'])
+
+    def test_option_links_carry_sort_param(self):
+        self.open_nitter('jack/status/20')
+        for slug in ['Relevance', 'Recency', 'Likes']:
+            self.assert_element(f'.reply-sort-option[href="?sort={slug}#r"]')
+
+    def test_load_more_preserves_sort(self):
+        self.open_nitter('jack/status/20?sort=Likes')
+        href = self.get_attribute('.replies .show-more a', 'href')
+        self.assert_true('sort=Likes' in href, f'sort missing from: {href}')