fix(angular): Handle routes with empty path

Update function getParameterizedRouteFromSnapshot to handle routes with empty paths.

Fixes GH-7681

Author: de-don

packages/angular/src/tracing.ts

@@ -282,14 +282,24 @@ export function TraceMethodDecorator(): MethodDecorator {
  * child route with its parent to produce the complete parameterized URL of the activated route.
  * This happens recursively until the last child (i.e. the end of the URL) is reached.
  *
- * @param route the ActivatedRouteSnapshot of which its path and its child's path is concantenated
+ * @param route the ActivatedRouteSnapshot of which its path and its child's path is concatenated
  *
- * @returns the concatenated parameterzited route string
+ * @returns the concatenated parameterized route string
  */
 export function getParameterizedRouteFromSnapshot(route?: ActivatedRouteSnapshot | null): string {
-  const path = route && route.firstChild && route.firstChild.routeConfig && route.firstChild.routeConfig.path;
-  if (!path) {
-    return '/';
+  const parts: string[] = [];
+
+  let currentRoute = route && route.firstChild;
+  while (currentRoute) {
+    const path = currentRoute && currentRoute.routeConfig && currentRoute.routeConfig.path;
+    if (path === null || path === undefined) {
+      break;
+    }
+
+    parts.push(path);
+    currentRoute = currentRoute.firstChild;
   }
-  return `/${path}${getParameterizedRouteFromSnapshot(route && route.firstChild)}`;
+
+  const fullPath = parts.filter(part => part).join('/');
+  return fullPath ? `/${fullPath}/` : '/';
 }

packages/angular/test/tracing.test.ts

@@ -56,6 +56,13 @@ describe('Angular Tracing', () => {
   describe('getParameterizedRouteFromSnapshot', () => {
     it.each([
       ['returns `/` empty object if the route no children', {}, '/'],
+      [
+        'returns `/` if the route with empty child',
+        {
+          firstChild: { routeConfig: { path: '' } },
+        },
+        '/',
+      ],
       [
         'returns the route of a snapshot without children',
         {
@@ -76,6 +83,21 @@ describe('Angular Tracing', () => {
         },
         '/orgs/:orgId/projects/:projId/overview/',
       ],
+      [
+        'returns the route of a snapshot without children but with empty paths',
+        {
+          firstChild: {
+            routeConfig: { path: 'users' },
+            firstChild: {
+              routeConfig: { path: '' },
+              firstChild: {
+                routeConfig: { path: ':id' },
+              },
+            },
+          },
+        },
+        '/users/:id/',
+      ],
     ])('%s', (_, routeSnapshot, expectedParams) => {
       expect(getParameterizedRouteFromSnapshot(routeSnapshot as unknown as ActivatedRouteSnapshot)).toEqual(
         expectedParams,
@@ -345,6 +367,7 @@ describe('Angular Tracing', () => {
       public ngOnInit() {
         origNgOnInitMock();
       }
+
       public ngAfterViewInit() {
         origNgAfterViewInitMock();
       }
@@ -398,6 +421,7 @@ describe('Angular Tracing', () => {
       public ngOnInit() {
         origNgOnInitMock();
       }
+
       @TraceMethodDecorator()
       public ngAfterViewInit() {
         origNgAfterViewInitMock();