steps toward test driver working

packages/test-in-browser/package.js

@@ -13,7 +13,7 @@ Package.on_use(function (api) {
 
   api.use('session');
 
-  api.use(['spark', 'livedata', 'templating', 'deps'], 'client');
+  api.use(['ui', 'livedata', 'deps'], 'client');
 
   api.add_files([
     'driver.css',

packages/ui/component.js

@@ -565,6 +565,10 @@ _.extend(Component.prototype, {
       result = If;
     } else if (id === 'each') {
       result = Each;
+    } else if (id === 'unless') {
+      result = Unless;
+    } else if (id === 'with') {
+      result = Component;
     } else if (id in global) {
       result = global[id];
       thisToBind = self.getData();

packages/ui/library.js

@@ -1,14 +1,24 @@
 // @export If
 If = Component.extend({
-  init: function () {
-    if (! this.getArg('content'))
-      throw new Error("If requires content");
-  },
   render: function (buf) {
-    if (this.getArg('data'))
-      buf.component(this.getArg('content').create());
-    else if (this.getArg('elseContent'))
-      buf.component(this.getArg('elseContent'));
+    if (this.getArg('data')) {
+      if (this.getArg('content'))
+        buf.component(this.getArg('content').create());
+    } else if (this.getArg('elseContent')) {
+      buf.component(this.getArg('elseContent').create());
+    }
+  }
+});
+
+// @export Unless
+Unless = Component.extend({
+  render: function (buf) {
+    if (! this.getArg('data')) {
+      if (this.getArg('content'))
+        buf.component(this.getArg('content').create());
+    } else if (this.getArg('elseContent')) {
+      buf.component(this.getArg('elseContent').create());
+    }
   }
 });