Implement final review comments from @rymai.
- `raise "string"` raises a `RuntimeError` - no need to be explicit - Remove top-level comment in the `RevList` class - Use `%w()` instead of `%w` - Extract an `environment_variables` method to cache `env.slice(*ALLOWED_VARIABLES)` - Use `start_with?` for env variable validation instead of regex match - Validation specs for each allowed environment variable were identical. Build them dynamically. - Minor change to `popen3` expectation.
Showing with 30 additions and 51 deletions