Mastodon: rewrite tests

app/logical/mastodon_api_client.rb

@@ -15,7 +15,7 @@ class MastodonApiClient
   def json
     return {} if id.blank? || access_token.blank?
     JSON.parse(access_token.get("/api/v1/statuses/#{id}").body)
-  rescue
+  rescue JSON::ParserError
     {}
   end
 

app/logical/source/extractor/mastodon.rb

@@ -52,7 +52,7 @@ class Source::Extractor
     end
 
     def artist_name
-      api_response.account_name
+      api_response.account_name || artist_name_from_url
     end
 
     def artist_name_from_url
@@ -60,7 +60,7 @@ class Source::Extractor
     end
 
     def other_names
-      [api_response.display_name]
+      [api_response.display_name].compact
     end
 
     def account_id