refactor(realtime): extract user event "version" to SocketClient

1. extract user event "version" to SocketClient
2. add test case for that

Signed-off-by: BoHong Li <a60814billy@gmail.com>

lib/realtime.js

@@ -771,6 +771,8 @@ class SocketClient {
     this.socket.on('cursor activity', this.cursorActivityEventHandler.bind(this))
     // received cursor blur
     this.socket.on('cursor blur', this.cursorBlurEventHandlder.bind(this))
+    // check version
+    this.socket.on('version', this.checkVersionEventHandler.bind(this))
   }
 
   isNoteAndUserExists () {
@@ -812,6 +814,13 @@ class SocketClient {
     })
   }
 
+  checkVersionEventHandler () {
+    this.socket.emit('version', {
+      version: config.fullversion,
+      minimumCompatibleVersion: config.minimumCompatibleVersion
+    })
+  }
+
   refreshEventHandler () {
     exports.emitRefresh(this.socket)
   }
@@ -998,14 +1007,6 @@ function connection (socket) {
     }
     socket.emit('online users', out)
   })
-
-  // check version
-  socket.on('version', function () {
-    socket.emit('version', {
-      version: config.fullversion,
-      minimumCompatibleVersion: config.minimumCompatibleVersion
-    })
-  })
 }
 
 exports = module.exports = realtime

test/realtime.test.js

@@ -15,6 +15,7 @@ function makeMockSocket (headers, query) {
       query: Object.assign({}, query)
     },
     on: sinon.fake(),
+    emit: sinon.fake(),
     broadCastChannelCache: {},
     broadcast: {
       to: (channel) => {
@@ -459,7 +460,10 @@ describe('realtime', function () {
           parseNoteTitle: (data) => (data)
         }
       })
-      mock('../lib/config', {})
+      mock('../lib/config', {
+        fullversion: '1.5.0',
+        minimumCompatibleVersion: '1.0.0'
+      })
       realtime = require('../lib/realtime')
 
       // get all socket event handler
@@ -609,5 +613,18 @@ describe('realtime', function () {
       })
     })
 
+    describe('version', function () {
+      it('should emit server version ', () => {
+        const versionFunc = eventFuncMap.get('version')
+        versionFunc()
+        assert(clientSocket.emit.called)
+        assert(clientSocket.emit.lastCall.args[0], 'version')
+        assert.deepStrictEqual(clientSocket.emit.lastCall.args[1], {
+          version: '1.5.0',
+          minimumCompatibleVersion: '1.0.0'
+        })
+      })
+    })
+
   })
 })