Disclosing source texts supports “community reviews”. However, helpful are only the experts within the “community”. Even open-source software does not eliminate the necessity for good test coverage: tests and reviews complement each other. Often, both source code and tests are provided for open-source software. Nevertheless, without code coverage, it is only possible to guess and hope that these tests cover all relevant areas. Yet, hope is not a strategy which should be employed for the success of a software development project. Thus, it is impossible to neglect tests to control test coverage when using the valuable resource “open-source software”.