sjhajharia opened a new pull request, #20303:
URL: https://github.com/apache/kafka/pull/20303
### Summary
Adds comprehensive test coverage for the StorageTool format command feature
validation, including tests for valid feature overrides, invalid feature
detection, and multiple feature specifications. Also adds debug output to help
with troubleshooting format operations.
### Changes Made
#### Test Coverage Improvements
- **`testFormatWithReleaseVersionAndFeatureOverride()`**: Tests that feature
overrides work correctly when specified with `--feature` flag
- **`testFormatWithInvalidFeatureThrowsError()`**: Tests error handling for
unsupported features
- **`testFormatWithMultipleFeatures()`**: Tests multiple feature
specifications in a single format command
#### Debug Output Enhancement
- **Formatter.java**: Added debug output to print bootstrap metadata during
format operations
- Helps with troubleshooting format issues by showing the complete
bootstrap metadata being written
- Improves visibility into what features and configurations are being
applied
#### Test Updates
- **FormatterTest.java**: Updated existing tests to account for the new
debug output\
### Related
- KIP-1022: [Formatting and Updating Features
](https://cwiki.apache.org/confluence/display/KAFKA/KIP-1022%3A+Formatting+and+Updating+Features)
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