Don't send an empty limit query parameter for Channel#get_reactions

lib/discordrb/api/channel.rb

@@ -201,7 +201,7 @@ def delete_user_reaction(token, channel_id, message_id, emoji, user_id)
   # https://discord.com/developers/docs/resources/channel#get-reactions
   def get_reactions(token, channel_id, message_id, emoji, before_id, after_id, limit = 100)
     emoji = URI.encode_www_form_component(emoji) unless emoji.ascii_only?
-    query_string = "limit=#{limit}#{"&before=#{before_id}" if before_id}#{"&after=#{after_id}" if after_id}"
+    query_string = "limit=#{limit || 100}#{"&before=#{before_id}" if before_id}#{"&after=#{after_id}" if after_id}"
     Discordrb::API.request(
       :channels_cid_messages_mid_reactions_emoji,
       channel_id,

spec/data/message_spec.rb

@@ -109,6 +109,35 @@
     end
   end
 
+  describe '#reacted_with' do
+    let(:message) { described_class.new(message_data, bot) }
+    let(:emoji) { double('emoji') }
+
+    it 'calls the API method' do
+      expect(Discordrb::API::Channel).to receive(:get_reactions)
+        .with(token, channel_id, any_args, 27)
+        .and_return('[]')
+      message.reacted_with('👍', limit: 27)
+    end
+
+    it 'defaults to a limit of 100' do
+      expect(Discordrb::API::Channel).to receive(:get_reactions)
+        .with(token, channel_id, any_args, 100)
+        .and_return('[]')
+      message.reacted_with('👍')
+    end
+
+    it 'converts Emoji to strings' do
+      allow(emoji).to receive(:to_reaction).and_return('123')
+
+      expect(Discordrb::API::Channel).to receive(:get_reactions)
+        .with(token, channel_id, anything, '123', any_args)
+        .and_return('[]')
+
+      message.reacted_with(emoji)
+    end
+  end
+
   describe '#reply!' do
     let(:message) { described_class.new(message_data, bot) }
     let(:content) { instance_double('String', 'content') }