[test] Support custom callback for URI probing

libview/src/application.ts

@@ -159,6 +159,19 @@ export function sameResources(first: Resource, second: Resource): boolean {
  * @param resource The resource
  */
 export function probeResource(resource: Resource): Promise<Resource> {
+  return probeResourceWith(resource, probeResourceUri);
+}
+
+/**
+ * Probes the different URIs for a resource and remove the dead ones
+ * Returns a promise for clean version of the resource
+ * @param resource The resource
+ * @param probe The probe function to use
+ */
+export function probeResourceWith(
+  resource: Resource,
+  probe: (uri: string) => Promise<string>
+): Promise<Resource> {
   return new Promise<Resource>(
     (resolve: (result: Resource) => void, reject: (reason: any) => void) => {
       let remaining: String[] = [];
@@ -187,9 +200,9 @@ export function probeResource(resource: Resource): Promise<Resource> {
  * Probes an URI for a resource to check whether it is valid
  * @param uri An URI
  */
-function probeResourceUri(uri: string): Promise<String> {
-  return new Promise<String>(
-    (resolve: (result: String) => void, reject: (reason: any) => void) => {
+function probeResourceUri(uri: string): Promise<string> {
+  return new Promise<string>(
+    (resolve: (result: string) => void, reject: (reason: any) => void) => {
       let xmlHttp = new XMLHttpRequest();
       xmlHttp.onreadystatechange = function() {
         if (xmlHttp.readyState === 4) {