Generate separate report for including snapshots

[geoff-powell]

https://github.com/cashapp/paparazzi/issues/1446

This borrows a bunch of classes from Gradle reporting to generate a junit html report with diff images included. It will add snapshots to the existing junit report. This was mainly in inspiration of the Google team's compose preview snapshot gradle plugin. Kudos!

Sample html report: sample-html-report.zip

[eygraber]

I'n not seeing the TestReport reporter being used with 1.3.5-SNAPSHOT. There are delta images being generated under build/paparazzi/failures/ but the HTML under build/reports/tests/test<variant>UnitTest doesn't reference them in any way.

I used reflection to read the reporter field and it is null.

[geoff-powell]

It will only be used if verifyPaparazzi[Debug] task is run. Otherwise it uses the default TestReporter

[eygraber]

I ran the verify task.

[geoff-powell]

hmm, interesting let me take a look

[eygraber]

If it helps the following is printed when running verifyPaparazziDevDebug (I have a dev/prod build flavor):

See the Paparazzi report at: file:///home/eli/workspace/my_project/build/reports/paparazzi/devDebug/index.html

There is a build/reports/paparazzi/devDebug directory, but it is empty. There is typical test result content under build/reports/tests/testDevDebugUnitTest.

[jrodbx]

Thanks for flagging @eygraber. Reminder to please file a new issue for tracking, vs commenting on closed PRs and issues.

Tracking in https://github.com/cashapp/paparazzi/issues/1651 and assigning to myself, as this is (hopefully) the last release blocker for 1.3.5.

[geoff-powell]

@eygraber Can you provide a sample project for this? I created a test project using build flavors and it seems like its working as expected. https://github.com/cashapp/paparazzi/compare/gpowell/flavor-snapshot-report?expand=1

[eygraber]

I don't have a sample project, but I'll try making one.