Prevent tearDownAfterClass exceptions from killing PHPUnit

[epdenouden]

Found out yesterday that tearDown[AfterClass] exceptions were not handled by TestSuite the way it does for setUp[BeforeClass]. PHP simply exits to the command line:

This fix will report exceptions in tearDownAfterClass() by adding a dummy test at the end of a TestSuite called tearDownAfterClass with the original message and stack trace. A corrected code location hint is added to the top pointing to the offending line.

On the command line:

./phpunit tests/_files/ExceptionInTearDownAfterClassTest.php                                                         ✔ 

[header]
..                                                                  2 / 2 (100%)F

Time: 251 ms, Memory: 4.00MB

There was 1 failure:

1) Failure::tearDownAfterClass
throw Exception in tearDownAfterClass()

/Users/ewout/proj/phpunit/tests/_files/ExceptionInTearDownAfterClassTest.php:28
/Users/ewout/proj/phpunit/src/Framework/TestSuite.php:755
[etc]

FAILURES!
Tests: 3, Assertions: 2, Failures: 1.

In IntelliJ it looks like this:

[codecov]

Codecov Report

Merging #3490 into 7.5 will increase coverage by 0.06%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##                7.5    #3490      +/-   ##
============================================
+ Coverage     83.36%   83.43%   +0.06%     
- Complexity     3622     3623       +1     
============================================
  Files           143      143              
  Lines          9639     9648       +9     
============================================
+ Hits           8036     8050      +14     
+ Misses         1603     1598       -5

Impacted Files	Coverage Δ	Complexity Δ
src/Framework/TestSuite.php	85.16% <100%> (+0.37%)	149 <0> (+1)	⬆️
src/Framework/SyntheticError.php	45.45% <0%> (+45.45%)	4% <0%> (ø)	⬇️

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