Flutter Image.network test fails because of exception

Question

I use Image.network to display images of items:

Image.network(
  pictureUri,
  errorBuilder: (context, error, stackTrace) => Image.asset(
    noPictureAssetUri,
  ),
);

when given item has an image, then the server returns that image, if the item has no image, then the server returns error 404.

It works fine in release mode - if there is image, it is displayed, and if server sends 404, then it uses the asset.

However when I'm running integration tests (flutter test integration_test), they show:

══╡ EXCEPTION CAUGHT BY IMAGE RESOURCE SERVICE ╞════════════════════════════════════════════════════ The following NetworkImageLoadException was thrown resolving an image codec: HTTP request failed, statusCode: 404,

and then it fails:

══╡ EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK ╞════════════════════════════════════════════════════ The following message was thrown: Multiple exceptions (5) were detected during the running of the current test, and at least one was unexpected.

The tests fails despite everything working as intended.

How can I make my tests pass? I need either:

• a way to catch these internal exceptions
• make flutter test ignore these exceptions.

I want to add that this is an end to end test, running on real (development) server, so I can't just mock http Client as it was suggested. I need a way to handle 404 error, when the real server returns it in debug mode.

My flutter doctor, in case you need it:

Doctor summary (to see all details, run flutter doctor -v):

[√] Flutter (Channel stable, 3.3.10, on Microsoft Windows [Version 10.0.22621.963], locale en-150)

[√] Android toolchain - develop for Android devices (Android SDK version 33.0.0)

[√] Chrome - develop for the web

[√] Android Studio (version 2021.2)

[√] VS Code (version 1.74.2)

[√] Connected device (4 available)

[√] HTTP Host Availability