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Add debugNetworkImageHttpClientProvider - #32857

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tvolkert merged 4 commits into
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tvolkert:testing
May 20, 2019
Merged

Add debugNetworkImageHttpClientProvider#32857
tvolkert merged 4 commits into
flutter:masterfrom
tvolkert:testing

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@tvolkert

@tvolkert tvolkert commented May 17, 2019

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Description

Currently, the fact that NetworkImage uses a static HttpClient
makes it impossible to properly test, as a mock in one test will
be reused in another test. This change fixes that.

Related Issues

#32374

Tests

This change is about preparing for tests that will land in a follow-on
PR - existing tests were restructured in this PR, but no new tests were added
(yet).

Checklist

  • I read the [Contributor Guide] and followed the process outlined there for submitting PRs.
  • I signed the [CLA].
  • I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement].
  • I updated/added relevant documentation (doc comments with ///).
  • All existing and new tests are passing.
  • The analyzer (flutter analyze --flutter-repo) does not report any problems on my PR.
  • I am willing to follow-up on review comments in a timely manner.

Breaking Change

  • Yes, this is a breaking change (Please read [Handling breaking changes]). Replace this with a link to the e-mail where you asked for input on this proposed change.
  • No, this is not a breaking change.

@tvolkert
Add debugNetworkImageUseFreshHttpClient
8f1c3b8 
Currently, the fact that NetworkImage uses a static HttpClient
makes it impossible to properly test, as a mock in one test will
be reused in another test. This change fixes that.

#32374
@tvolkert
tvolkert requested a review from goderbauer May 17, 2019 00:32
@tvolkert

tvolkert commented May 17, 2019

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This change depends on #32853, since otherwise we'd receive compressed bytes after consolidation.

@tp

tp commented May 17, 2019

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@tvolkert Is there a chance to extend this provide a specific HttpClient just for the NetworkImage?

In our testing we have a "record" mode (with --update-goldens) where we'd like to have most API calls go through and have images mocked with a placeholder.

With the approach introduces here, we'd still have to write a rather smart HTTP client mock that in recording mode returns fallback images for some requests (from NetworkImage) and allows others to pass through, and then in non-update mode forbids all outgoing requests but returns the fallback data again for the images.

@tvolkert

tvolkert commented May 17, 2019

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@tp yep that makes sense. I'll update this PR shortly.

@jonahwilliams

jonahwilliams commented May 17, 2019

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You can provide a specific HttpClient using HttpOverrides

@tvolkert

tvolkert commented May 17, 2019

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@jonahwilliams yes, but allowing debug builds direct access to the creation of the client does simplify things a lot (including the tests).

@tvolkert tvolkert changed the title Add debugNetworkImageUseFreshHttpClient Add debugNetworkImageHttpClientProvider May 17, 2019
@Piinks Piinks added a: images Loading, displaying, rendering images framework flutter/packages/flutter repository. See also f: labels. labels May 17, 2019
@tvolkert tvolkert mentioned this pull request May 18, 2019
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goderbauer
goderbauer reviewed May 20, 2019
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Comment thread packages/flutter/lib/src/painting/debug.dart Outdated
Comment thread packages/flutter/lib/src/painting/image_provider.dart Outdated
Comment thread packages/flutter/lib/src/painting/image_provider.dart Outdated
Comment thread packages/flutter/lib/src/painting/debug.dart Outdated
@goderbauer

goderbauer commented May 20, 2019

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no new tests were added (yet).

You could add a test to verify that NetworkImage actually uses the HttpClient from debugNetworkImageHttpClientProvider if it is set.

goderbauer
goderbauer approved these changes May 20, 2019
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LGTM

@tvolkert
tvolkert merged commit 2b15b24 into flutter:master May 20, 2019
@tvolkert
tvolkert deleted the testing branch May 20, 2019 23:33
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