Move testing of deferred deserializers to atom-spec

spec/app/atom-package-spec.coffee

@@ -1,20 +0,0 @@
-RootView = require 'root-view'
-AtomPackage = require 'atom-package'
-fs = require 'fs-utils'
-
-describe "AtomPackage", ->
-  [packageMainModule, pack] = []
-
-  beforeEach ->
-    pack = new AtomPackage(fs.resolve(config.packageDirPaths..., 'package-with-activation-events'))
-    pack.load()
-
-  describe ".load()", ->
-    describe "if the package's metadata has a `deferredDeserializers` array", ->
-      it "requires the package's main module attempting to use deserializers named in the array", ->
-        expect(pack.mainModule).toBeNull()
-        object = deserialize(deserializer: 'Foo', data: "Hello")
-        expect(object.constructor.name).toBe 'Foo'
-        expect(object.data).toBe 'Hello'
-        expect(pack.mainModule).toBeDefined()
-        expect(pack.mainModule.activateCallCount).toBe 0

spec/app/atom-spec.coffee

@@ -8,6 +8,16 @@ describe "the `atom` global", ->
     window.rootView = new RootView
 
   describe "package lifecycle methods", ->
+    describe ".loadPackage(id)", ->
+      describe "when the package has deferred deserializers", ->
+        it "requires the package's main module if one of its deferred deserializers is referenced", ->
+          pack = atom.loadPackage('package-with-activation-events')
+          expect(pack.mainModule).toBeNull()
+          object = deserialize({deserializer: 'Foo', data: 5})
+          expect(pack.mainModule).toBeDefined()
+          expect(object.constructor.name).toBe 'Foo'
+          expect(object.data).toBe 5
+
     describe ".activatePackage(id)", ->
       describe "atom packages", ->
         describe "when the package has a main module", ->