test: add merge script

Author: yeikos

dist/merge.browser.test.html

@@ -13,7 +13,8 @@
     <script class="mocha-init">
       mocha.setup('bdd');
       mocha.checkLeaks();
-    </script>
+	</script>
+	<script src="./merge.browser.min.js"></script>
     <script src="./merge.browser.test.js"></script>
     <script class="mocha-exec">
       mocha.run();