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Branch Coverage Improvement Plan

Chosen brainstorm: branch-coverage-improvement.brainstorm.md

Goal And Scope

Raise branch coverage above the 83.28% baseline with meaningful boundary tests for the current Tiktoken graph extraction, Markdown parsing, converter, and search behavior. Keep coverage collection on Microsoft.Testing.Extensions.CodeCoverage; Cobertura remains only the report output format.

Baseline

  • Full test suite baseline: 73 passed, 0 failed.
  • Coverage baseline: line 95.39%, branch 83.28%.
  • Coverage collector: Microsoft.Testing.Extensions.CodeCoverage.
  • Coverlet packages are not referenced by the solution.

Already Failing Tests

  • None known.

Ordered Steps

  • Add Tiktoken entity-hint boundary tests for scalar, numeric, value, same_as, blank, null, and empty-map shapes.
  • Add parser boundary tests for empty front matter, null metadata values, BOM-only source, and blank YAML keys.
  • Add converter boundary tests for default content conversion, media type override trimming, missing directories, no-extension files, and unsupported files when skipping is disabled.
  • Add search-service merge test for repeated optional SPARQL rows.
  • Run build, test, coverage, format, and diff checks.
  • Update README with verified test and coverage numbers.

Testing Methodology

The added tests exercise public flows:

flowchart LR
    Markdown["Boundary Markdown/front matter"] --> Parser["Markdown parser"]
    Parser --> Pipeline["Tiktoken graph pipeline"]
    Pipeline --> Graph["In-memory RDF graph"]
    Graph --> Query["SPARQL/search assertions"]
    Converter["Source converter"] --> Pipeline
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Result

  • Final tests: 77 passed, 0 failed.
  • Final line coverage: 96.30%.
  • Final branch coverage: 85.23%.
  • Branch coverage increase: 83.28% to 85.23%.