Move another integration test

spec/integration/startup-spec.coffee

@@ -56,18 +56,6 @@ describe "Starting Atom", ->
           .waitForWindowCount(1, 5000)
 
   describe "launching with no path", ->
-    it "opens a new window with a single untitled buffer", ->
-      runAtom [], {ATOM_HOME: atomHome}, (client) ->
-        client
-          .waitForPaneItemCount(1, 5000)
-
-          # Opening with no file paths always creates a new window, even if
-          # existing windows have no project paths.
-          .waitForNewWindow(->
-            @startAnotherAtom([], ATOM_HOME: atomHome)
-          , 5000)
-          .waitForPaneItemCount(1, 5000)
-
     it "doesn't open a new window if openEmptyEditorOnStart is disabled", ->
       configPath = path.join(atomHome, 'config.cson')
       config = CSON.readFileSync(configPath)

spec/main-process/atom-application.test.js

@@ -224,6 +224,17 @@ describe('AtomApplication', function () {
       })
       assert.deepEqual(treeViewPaths, [dirAPath, dirBPath])
     })
+
+    it('reuses windows with no project paths to open directories', async function () {
+      const tempDirPath = makeTempDir()
+      const atomApplication = buildAtomApplication()
+      const window1 = atomApplication.openWithOptions(parseCommandLine([]))
+      await window1.loadedPromise
+
+      const reusedWindow = atomApplication.openWithOptions(parseCommandLine([tempDirPath]))
+      assert.equal(reusedWindow, window1)
+      assert.deepEqual(await getTreeViewRootDirectories(window1), [tempDirPath])
+    })
   })
 
   function buildAtomApplication () {