Dart 2.12 compatibility

[trygvis]

Running dart migrate tool, accepting all changes.

With this change I can get dart-junitreport to work with Dart 2.12.

Note that this also bumps the major version to 2.0.0 which seems to be the norm for null-save libraries.

[trygvis]

See also TOPdesk/dart-junitreport#31

[renatoathaydes]

@rspilker looks like a nice pull request, making this project null-safe... could you have a look into it? Would be nice to get a null-safe release.

[renatoathaydes]

@trygvis do you know if this project, after your updates, supports all of the features of the Dart tester? As in, will it correctly and fully parse every possible test report output?

[trygvis]

@renatoathaydes That is hard to know without having every possible test report :)

I've just gotten it to work for me, it worked nicely on the few test reports I have in my Gitlab setup. The code is quite easy to work with though, so if you have found an issue it shouldn't be too hard to fix.

[renatoathaydes]

That is hard to know without having every possible test report

So I suppose the JSON format is undocumented?

[trygvis]

No, it's quite well documented: https://github.com/dart-lang/test/blob/master/pkgs/test/doc/json_reporter.md

[renatoathaydes]

Ah, so maintaining full compatibility looks pretty easy.

[renatoathaydes]

That doc turned out to be really useful... I published a package on pub.dev that generates the model and a JSON parser automatically just from that markdown doc:

https://github.com/renatoathaydes/test_report_parser.dart

So hopefully, when they update the docs, all I need to do is re-run the generator and publish it again on pub.dev.

@trygvis Feel free to use that instead of this package as it's kind of un-maintained from the looks of it.