[mastodon] Omit empty limit param in search API call, for Pleroma

for snarfed/bridgy#977 , https://git.pleroma.social/pleroma/pleroma/-/issues/2198

README.md

@@ -320,6 +320,7 @@ Changelog
   * Bug fix: URL-encode list names in API calls.
 * Mastodon:
   * Bug fix for alt text with image attachments ([bridgy#975](https://github.com/snarfed/bridgy/issues/975)).
+  * Omit empty `limit` param [for compatibility with Pleroma](https://git.pleroma.social/pleroma/pleroma/-/issues/2198) ([bridgy#977](https://github.com/snarfed/bridgy/issues/977)).
 
 ### 3.0 - 2020-04-08
 

granary/mastodon.py

@@ -198,7 +198,7 @@ def get_activities_response(self, user_id=None, group_id=None, app_id=None,
         'q': search_query,
         'resolve': True,
         'offset': start_index,
-        'limit': count if count else '',
+        **params,
       }).get('statuses', [])
     else:  # eg group_id SELF
       statuses = self._get(API_ACCOUNT_STATUSES % user_id, params=params)

granary/tests/test_mastodon.py

@@ -420,17 +420,27 @@ def test_get_activities_self_default_user(self):
     self.mox.ReplayAll()
     self.assert_equals([ACTIVITY], self.mastodon.get_activities(group_id=source.SELF))
 
-  def test_get_activities_search(self):
+  def test_get_activities_search_without_count(self):
     self.expect_get(API_SEARCH, params={
       'q': 'indieweb',
       'resolve': True,
       'offset': 0,
-      'limit': '',
     }, response={'statuses': [STATUS, MEDIA_STATUS]})
     self.mox.ReplayAll()
     self.assert_equals([ACTIVITY, MEDIA_ACTIVITY], self.mastodon.get_activities(
         group_id=source.SEARCH, search_query='indieweb'))
 
+  def test_get_activities_search_with_count(self):
+    self.expect_get(API_SEARCH, params={
+      'q': 'indieweb',
+      'resolve': True,
+      'offset': 0,
+      'limit': 123,
+    }, response={'statuses': [STATUS, MEDIA_STATUS]})
+    self.mox.ReplayAll()
+    self.assert_equals([ACTIVITY, MEDIA_ACTIVITY], self.mastodon.get_activities(
+        group_id=source.SEARCH, search_query='indieweb', count=123))
+
   def test_get_activities_search_no_query(self):
     with self.assertRaises(ValueError):
       self.mastodon.get_activities(group_id=source.SEARCH, search_query=None)