fix 'moves to next segment if network error'

@@ -366,13 +366,10 @@ asyncTest('selects a playlist after segment downloads', function() {
   player.trigger('timeupdate');
 });
 
-test('moves to the next segment if there is a network error', function() {
+asyncTest('moves to the next segment if there is a network error', function() {
   var mediaIndex;
-  player.hls('manifest/master.m3u8');
-  videojs.mediaSources[player.currentSrc()].trigger({
-    type: 'sourceopen'
-  });
 
+  player.on('loadedmanifest', function() {
     // fail the next segment request
     window.XMLHttpRequest = function() {
       this.open = function() {};
@@ -380,12 +377,20 @@ test('moves to the next segment if there is a network error', function() {
         this.readyState = 4;
         this.status = 400;
         this.onreadystatechange();
+
+        strictEqual(mediaIndex + 1, player.hls.mediaIndex, 'media index is incremented');
+        start();
       };
     };
+
     mediaIndex = player.hls.mediaIndex;
     player.trigger('timeupdate');
+  });
 
-  strictEqual(mediaIndex + 1, player.hls.mediaIndex, 'media index is incremented');
+  player.hls('manifest/master.m3u8');
+  videojs.mediaSources[player.currentSrc()].trigger({
+    type: 'sourceopen'
+  });
 });
 
 test('updates the duration after switching playlists', function() {