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FORM's internal interface can write a data product, add a simple field to that data product, read it back, and print the same fields from both. Really tests ROOT's schema evolution facilities for now. This will become more relevant for RNTuple and other formats, and it may even cover future advanced schema evolution features in FORM.
FORM uses ROOT's schema evolution.
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Codecov Report✅ All modified and coverable lines are covered by tests. @@ Coverage Diff @@
## main #388 +/- ##
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- Coverage 86.45% 86.39% -0.07%
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Files 119 119
Lines 2399 2403 +4
Branches 387 387
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+ Hits 2074 2076 +2
Misses 207 207
- Partials 118 120 +2
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FORM should currently support ROOT's schema evolution facilities for adapting to relatively simple changes to data products. Verifying this is useful for FORM development because RNTuple exposes an interface that bypasses schema evolution. This test builds on the
Track_Startdata product used in existing FORM tests to verify that FORM's TTree container successfully supports ROOT's schema evolution. Future FORM container technologies will be accompanied by an extension of this test.