How to test Image widgets source path in Flutter

Question

I have the following setup:

return Container(
      child: widget.searchResult.companyLogoUrl.isEmpty
          ? Image.asset('assets/images/missing-company-logo.png')
          : Image.network(widget.searchResult.companyLogoUrl),
    )

And now I want to test that the missing logo image is loaded when no url is provided. How can I get the source url or local file after obtain the Image widget in a test?

testWidgets('given', (tester) async {
      await tester.pumpWidget(createSearchResultCard(mockResponse));
      await tester.pumpAndSettle();
      final Image image = find.byType(Image).evaluate().single.widget as Image;
      final String source = image. // How do I get the file source?
      expect(...)
    });

Is there a way to tell which picture has been loaded?

Solution

Check what the image provider is with the image property of the Image widget class. From there you can extract individual properties:

String source;
if(image.image is AssetImage) {
  source = image.image.assetName;
} else if(image.image is NetworkImage) {
  source = image.image.url;
}

You could expand his to include more possible image providers as needed.

Comments

[Joel Broström]

It works. I had to typecast image.image once more in the if case, but after that it was smooth sailing.