Fix tests

spec/history-manager-spec.js

@@ -43,7 +43,7 @@ describe("HistoryManager", () => {
     it("registers the 'clear-project-history' command function", () => {
       expect(commandRegistry.add).toHaveBeenCalled()
       const cmdCall = commandRegistry.add.calls[0]
-      expect(cmdCall.args.length).toBe(2)
+      expect(cmdCall.args.length).toBe(3)
       expect(cmdCall.args[0]).toBe('atom-workspace')
       expect(typeof cmdCall.args[1]['application:clear-project-history']).toBe('function')
     })

src/workspace.js

@@ -106,6 +106,7 @@ module.exports = class Workspace extends Model {
     this.openers = []
     this.destroyedItemURIs = []
     this.consumeServices(this.packageManager)
+    this.initialize()
   }
 
   subscribeToEvents () {