[TASK] Allow assertInstanceOf calls in tests

We find those checks useful.

Author: oliverklee

config/phpstan.neon

@@ -12,3 +12,8 @@ parameters:
     - %currentWorkingDirectory%/bin/
     - %currentWorkingDirectory%/src/
     - %currentWorkingDirectory%/tests/
+
+  ignoreErrors:
+    -
+      message: '#^Call to static method PHPUnit\\Framework\\Assert\:\:assertInstanceOf\(\) .* will always evaluate to#'
+      path: '../tests/'