Add unsend event and spec

Author: dlackty

lib/line/bot/event.rb

@@ -21,6 +21,7 @@
 require 'line/bot/event/message'
 require 'line/bot/event/postback'
 require 'line/bot/event/unfollow'
+require 'line/bot/event/unsend'
 require 'line/bot/event/member_joined'
 require 'line/bot/event/member_left'
 require 'line/bot/event/things'

lib/line/bot/event/unsend.rb

@@ -0,0 +1,27 @@
+# Copyright 2016 LINE
+#
+# LINE Corporation licenses this file to you under the Apache License,
+# version 2.0 (the "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at:
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+module Line
+  module Bot
+    module Event
+      # Event object for when the user unsends a message in a group or room.
+      #
+      # No replyToken is generated for this event.
+      #
+      # https://developers.line.biz/en/reference/messaging-api/#unsend-event
+      class Unsend < Base
+      end
+    end
+  end
+end

spec/line/bot/client_parse_spec.rb

@@ -272,6 +272,19 @@
         "deviceId": "deviceid4",
         "type": "unsupport"
       }
+    },
+    {
+      "type": "unsend",
+      "mode": "active",
+      "timestamp": 1462629479859,
+      "source": {
+        "type": "group",
+        "groupId": "Ca56f94637c...",
+        "userId": "U4af4980629..."
+      },
+      "unsend": {
+        "messageId": "325708"
+      }
     }
   ]
 }
@@ -402,6 +415,8 @@ def generate_client
     expect(events[18]).to be_a(Line::Bot::Event::Things)
     expect(events[18].type).to eq(Line::Bot::Event::ThingsType::Unsupport)
     expect(events[18].device_id).to eq('deviceid4')
+
+    expect(events[19]).to be_a(Line::Bot::Event::Unsend)
   end
 
   it 'parses unknown event' do