473f448b22
The `OnSystem.os_condition_met?` method only handles Linux and macOS values for the current OS, so this fails when testing with a generic OS. This shortcoming is only being surfaced now because there weren't any tests for `OnSystem` before. This addresses the issue by accounting for macOS values (`:macos` or a symbol from `MacOSVersion::SYMBOLS`) and returning `false` for any other values (`:linux`, `:generic`, etc.).