PHPStanTestCase: Added a helper method to assert no errors happend

[staabm]

in case the assertNoErrors assertion fails, the helper prints out the emitted errors to ease debugging.

before this PR a unit test which does not expect errors failed with:

$ vendor/bin/phpunit tests/PHPStan/Analyser/AnalyserIntegrationTest.php --bootstrap tests/bootstrap-static-reflection.php
PHPUnit 9.5.11 by Sebastian Bergmann and contributors.

Warning:       No code coverage driver available

..............F.....................................              52 / 52 (100%)

Time: 00:02.842, Memory: 94.00 MB

There was 1 failure:

1) PHPStan\Analyser\AnalyserIntegrationTest::testExtendsPdoStatementCrash
Failed asserting that actual size 6 matches expected size 0.

DX wise this is not really helpful, as the next step is to add debugging statements, so we can actually see the errors.

with this PR we add a new assertNoErrors helper method which prints out the errors, so we can directly see the problem

$ vendor/bin/phpunit tests/PHPStan/Analyser/AnalyserIntegrationTest.php --bootstrap tests/bootstrap-static-reflection.php
PHPUnit 9.5.11 by Sebastian Bergmann and contributors.

Warning:       No code coverage driver available

..............F.....................................              52 / 52 (100%)

Time: 00:02.842, Memory: 94.00 MB

There was 1 failure:

1) PHPStan\Analyser\AnalyserIntegrationTest::testExtendsPdoStatementCrash
Failed asserting that actual size 2 matches expected size 0.

Emitted errors:
- PHPDoc tag @return with type bool is incompatible with native type void
  in C:\dvl\Workspace\phpstan-src-staabm\tests\PHPStan\Analyser\data\extends-pdo-statement.php on line 88

- Method ExtendsPdoStatementCrash\CrashSix::setFetchMode() with return type void returns true but should not return anything
  in C:\dvl\Workspace\phpstan-src-staabm\tests\PHPStan\Analyser\data\extends-pdo-statement.php on line 90

[ondrejmirtes]

Thank you!

1. Emitted-Errors - space instead of - and lower caps e in Errors please.
2. Please include the error line in the error message as well.

[staabm]

adjusted per feedback. I went a step further and formatted the errors a bit more.

example:

$ vendor/bin/phpunit tests/PHPStan/Analyser/AnalyserIntegrationTest.php --bootstrap tests/bootstrap-static-reflection.php
PHPUnit 9.5.11 by Sebastian Bergmann and contributors.

Warning:       No code coverage driver available

..............F.....................................              52 / 52 (100%)

Time: 00:03.076, Memory: 94.00 MB

There was 1 failure:

1) PHPStan\Analyser\AnalyserIntegrationTest::testExtendsPdoStatementCrash
Failed asserting that actual size 2 matches expected size 0.

Emitted errors:
- PHPDoc tag @return with type bool is incompatible with native type void
  in C:\dvl\Workspace\phpstan-src-staabm\tests\PHPStan\Analyser\data\extends-pdo-statement.php on line 88

- Method ExtendsPdoStatementCrash\CrashSix::setFetchMode() with return type void returns true but should not return anything
  in C:\dvl\Workspace\phpstan-src-staabm\tests\PHPStan\Analyser\data\extends-pdo-statement.php on line 90

[staabm]

remaining errors seem unrelated

[ondrejmirtes]

Thank you!