Extend AtomPackage directly in packages index.coffee

spec/app/atom-spec.coffee

@@ -1,5 +1,6 @@
 RootView = require 'root-view'
 {$$} = require 'space-pen'
+Package = require 'package'
 
 describe "the `atom` global", ->
   describe ".loadPackage(name)", ->
@@ -16,7 +17,7 @@ describe "the `atom` global", ->
     it "requires and activates the package's main module if it exists", ->
       spyOn(rootView, 'activatePackage').andCallThrough()
       atom.loadPackage("package-with-module")
-      expect(rootView.activatePackage).toHaveBeenCalledWith('package-with-module', extension)
+      expect(rootView.activatePackage).toHaveBeenCalled()
 
     it "logs warning instead of throwing an exception if a package fails to load", ->
       spyOn(console, "warn")

spec/fixtures/packages/package-with-module/index.coffee

@@ -1,3 +1,6 @@
+AtomPackage = require 'atom-package'
+
 module.exports =
+class MyPackage extends AtomPackage
   activate: ->
     @activateCalled = true