migrated casper/agent tests to new testing format

@@ -12,15 +12,12 @@ function fetchUA(request) {
     }).pop().value, /plop/);
 }
 
-testUA(casper.options.pageSettings.userAgent, /CasperJS/);
-
-casper.start();
-
-casper.userAgent('plop').on('resource.requested', fetchUA);
-
-casper.thenOpen('tests/site/index.html');
-
-casper.run(function() {
-    this.removeListener('resource.requested', fetchUA);
-    this.test.done(3);
+casper.test.begin('userAgent() tests', 3, function(test) {
+    testUA(casper.options.pageSettings.userAgent, /CasperJS/);
+    casper.start();
+    casper.userAgent('plop').on('resource.requested', fetchUA);
+    casper.thenOpen('tests/site/index.html').run(function() {
+        this.removeListener('resource.requested', fetchUA);
+        test.done();
+    });
 });