fix tests that rely on timeout between setup and test

Author: nightwing

src/ext/command_bar_test.js

@@ -585,7 +585,8 @@ module.exports = {
         tooltipVisibilityCheck(true);
         commandBarTooltip.detach();
     },
-    "test: does not display if the tooltip does not fit into the screen": function() {
+    "test: does not display if the tooltip does not fit into the screen": async function() {
+        await lang.sleep(0);
         createTooltip();
 
         var testString = "a".repeat(100) +

src/scrollbar_test.js

@@ -50,6 +50,8 @@ module.exports = {
         editor.setOptions({
             customScrollbar: true
         });
+        // TODO remove this when onresize doesn't recreate custom scrollbar
+        renderer.$loop._flush();
     },
     tearDown: function () {
         editor && editor.destroy();

src/virtual_renderer_test.js

@@ -481,6 +481,8 @@ module.exports = {
         done();
     },
     "test: scroll cursor into view": function() {
+        editor.renderer.$loop._flush();
+        
         function X(n) {
             return "X".repeat(n);
         }