only register echo pipe when running tests

index.js

@@ -20,7 +20,8 @@ function loadScript(path) {
   var midletClassName = urlParams.midletClassName ? urlParams.midletClassName.replace(/\//g, '.') : "RunTests";
   var loadingPromises = [];
   if (midletClassName == "RunTests") {
-    loadingPromises.push(loadScript("tests/contacts.js"));
+    loadingPromises.push(loadScript("tests/contacts.js"),
+                         loadScript("tests/index.js"));
   }
 
   Promise.all(loadingPromises).then(function() {
@@ -151,10 +152,6 @@ document.getElementById("mozbrowser").addEventListener("mozbrowsershowmodalpromp
                                                        DumbPipe.handleEvent.bind(DumbPipe),
                                                        true);
 
-DumbPipe.registerOpener("echo", function(message, sender) {
-  sender(message);
-});
-
 DumbPipe.registerOpener("mobileInfo", function(message, sender) {
   // Initialize the object with the URL params and fallback placeholders
   // for testing/debugging on a desktop.

tests/index.js

@@ -0,0 +1,3 @@
+DumbPipe.registerOpener("echo", function(message, sender) {
+  sender(message);
+});