Catch and display errors during bootstrapping when using testdox printer

[rpkamp]

Fixes #3107

It changes quite some stuff around, not sure if you're fine with breaking BC for this. If not, we'd need to find a different solution.

Example output:

[sebastianbergmann]

Thank you for working on this!

Can you elaborate on the BC break?

The tests fail on PHP 7.3.

[sebastianbergmann]

@mhujer PHPStan complains about a function that does not exist. That is, of course, correct but not what we want here.

[mhujer]

@sebastianbergmann It should be enough to add it to ignoreErrors section in phpstan-tests.neon:

        # intentionally non existent function in tests/Regression/GitHub/3107/Issue3107Test.php
        - '#Function does_not_exist not found#'

(should be copy&paste-able)

[rpkamp]

Checking again I don't think there is a serious BC break after all, since the class that changed the most (now PHPUnit\Util\TestDox\RunningTestResult, used to be PHPUnit\Util\TestDox\TestResult - which is now an interface) was final anyway. so no-one could have extended that. They might have been using it, but that seems like a stretch.

[codecov-io]

Codecov Report

Merging #3108 into master will increase coverage by 0.11%.
The diff coverage is 95.69%.

@@             Coverage Diff              @@
##             master    #3108      +/-   ##
============================================
+ Coverage     80.91%   81.03%   +0.11%     
- Complexity     2903     2912       +9     
============================================
  Files           108      109       +1     
  Lines          7598     7628      +30     
============================================
+ Hits           6148     6181      +33     
+ Misses         1450     1447       -3

Impacted Files	Coverage Δ	Complexity Δ
src/Util/TestDox/CliTestDoxPrinter.php	88.09% <100%> (+4.14%)	28 <0> (+1)	⬆️
src/Util/TestDox/RunningTestResult.php	94.64% <94.64%> (ø)	24 <24> (?)
src/Util/TestDox/BootstrappingTestResult.php	96.29% <96.29%> (ø)	8 <8> (?)
src/Framework/TestResult.php	72.09% <0%> (+0.25%)	158% <0%> (ø)	⬇️

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[rpkamp]

• Fixed PHPStan error by adding it to ignoreErrors - thanks @mhujer
• Fixed tests in PHP 7.3 by looking for %Sdoes_not_exist() in EXPECTF test
• Fixed CS errors

Commit amended and force pushed, all tests are green now

ping @sebastianbergmann

[sebastianbergmann]

Merged manually, thanks.