test: catch unhandled in a network test (#10242)

test/src/navigation.spec.ts

@@ -371,17 +371,26 @@ describe('navigation', function () {
           // Ignore Error that arise from test server during hooks
         });
 
-      // Navigate to a page which loads immediately and then does a bunch of
-      // requests via javascript's fetch method.
-      const navigationPromise = page.goto(server.PREFIX + '/networkidle.html', {
-        waitUntil: 'networkidle0',
-      });
       // Track when the navigation gets completed.
       let navigationFinished = false;
-      navigationPromise.then(() => {
+      let navigationError: Error | undefined;
-        return (navigationFinished = true);
+      // Navigate to a page which loads immediately and then does a bunch of
+      // requests via javascript's fetch method.
+      const navigationPromise = page
+        .goto(server.PREFIX + '/networkidle.html', {
+          waitUntil: 'networkidle0',
+        })
+        .then(response => {
+          navigationFinished = true;
+          return response;
+        })
+        .catch(error => {
+          navigationError = error;
+          return null;
         });
 
+      let afterNavigationError: Error | undefined;
+      const afterNavigationPromise = (async () => {
         // Wait for the page's 'load' event.
         await waitEvent(page, 'load');
         expect(navigationFinished).toBe(false);
@@ -411,10 +420,21 @@ describe('navigation', function () {
           response.statusCode = 404;
           response.end(`File not found`);
         }
+      })().catch(error => {
+        afterNavigationError = error;
+      });
 
-      const response = (await navigationPromise)!;
+      await Promise.race([navigationPromise, afterNavigationPromise]);
+      if (navigationError) {
+        throw navigationError;
+      }
+      await Promise.all([navigationPromise, afterNavigationPromise]);
+      if (afterNavigationError) {
+        throw afterNavigationError;
+      }
       // Expect navigation to succeed.
-      expect(response.ok()).toBe(true);
+      expect(navigationFinished).toBeTruthy();
+      expect((await navigationPromise)?.ok()).toBe(true);
     });
     it('should not leak listeners during navigation', async function () {
       this.timeout(25_000);