Avoid the user of WorkspaceView in tests

package.json

@@ -4,7 +4,7 @@
   "version": "0.1.0",
   "private": true,
   "contributors": [
-    "Seongjae Lee <seongjaelee@gmail.com>"
+    "Seongjae Lee <seongjae@gmail.com>"
   ],
   "description": "Notational Velocity for Atom",
   "activationCommands": {

spec/notational-velocity-spec.coffee

@@ -1,4 +1,3 @@
-{WorkspaceView} = require 'atom'
 NotationalVelocity = require '../lib/notational-velocity'
 
 # Use the command `window:run-package-specs` (cmd-alt-ctrl-p) to run specs.
@@ -9,9 +8,10 @@ NotationalVelocity = require '../lib/notational-velocity'
 describe "NotationalVelocity", ->
   defaultDirectory = atom.config.get('notational-velocity.directory')
   activationPromise = null
+  workspaceElement = null
 
   beforeEach ->
-    atom.workspaceView = new WorkspaceView
+    workspaceElement = atom.views.getView(atom.workspace)
     activationPromise = atom.packages.activatePackage('notational-velocity')
     atom.config.set('notational-velocity.directory', 'testdata')
 
@@ -20,15 +20,15 @@ describe "NotationalVelocity", ->
 
   describe "when the notational-velocity:toggle event is triggered", ->
     it "attaches and then detaches the view", ->
-      expect(atom.workspaceView.find('.notational-velocity')).not.toExist()
+      expect(workspaceElement.querySelector('.notational-velocity')).not.toExist()
 
       # This is an activation event, triggering it will cause the package to be
       # activated.
-      atom.commands.dispatch atom.workspaceView.element, 'notational-velocity:toggle'
+      atom.commands.dispatch workspaceElement, 'notational-velocity:toggle'
 
       waitsForPromise ->
         activationPromise
 
       runs ->
-        expect(atom.workspaceView.find('.notational-velocity')).toExist()
-        atom.commands.dispatch atom.workspaceView.element, 'notational-velocity:toggle'
+        expect(workspaceElement.querySelector('.notational-velocity')).toExist()
+        atom.commands.dispatch workspaceElement, 'notational-velocity:toggle'