* replace removed forkMode
* remove junit runner where it's not needed
* update samples without skipping test files, but skip files named "FILES"
* revert overwriting custom tests, add custom java tests to list
* add one sample to CircleCI, fix various Java tests
It's reported by phpstan as `Dynamic call to static method PHPUnit\Framework\Assert::markTestIncomplete().`.
The method is static, therefore it should not be called from instance context.
