Add regression test for anonymous class in trait

[herndlm]

Regression test for phpstan/phpstan#6472 which was also fixed by #946.

Feel free to just close this if not needed.

[ondrejmirtes]

What’s the error if you revert the fix please?

[herndlm]

1) PHPStan\Analyser\AnalyserIntegrationTest::testBug6472
Failed asserting that actual size 1 matches expected size 0.

Emitted errors:
- Method Bug6472\B::b() has parameter $array with no value type specified in iterable type array
  in <....>/phpstan-src/tests/PHPStan/Analyser/data/bug-6472.php (in context of class Bug6472\B) on line 20

[ondrejmirtes]

Please move the test to the rule that reports this error.

Usually regresion tests belong either to NodeScopeResolverTest, or to a unit test of a specific rule.

AnalyserIntegrationTest should be reserved only for bugs that crash PHPStan/infinite recursion etc.

[herndlm]

Moved. If the fix is reverted I now get

1) PHPStan\Rules\Methods\MissingMethodParameterTypehintRuleTest::testBug6472
Failed asserting that two strings are identical.
--- Expected
+++ Actual
@@ @@
-'
+'20: Method Bug6472\B::b() has parameter $array with no value type specified in iterable type array.
+    💡 See: https://phpstan.org/blog/solving-phpstan-no-value-type-specified-in-iterable-type
 '

[ondrejmirtes]

Perfect, thank you.