test(code-graph): add Kotlin data-class component-function fixture

Chaitanya Manikrequested to merge
ChaitanyaManik17/knowledge-graph:test/761-kotlin-data-class-fixture into main

What

Add fixtures/kotlin/data_classes.yaml with test coverage for Kotlin data classes, including definition extraction, constructor calls, property fields, and cross-file destructuring.

Why

Kotlin data classes generate component1(), component2(), copy(), etc. implicitly. Destructuring syntax (val (a, b) = pair) compiles to component calls. There was no test coverage for data classes.

This fixture pins down the current indexer behavior so regressions are caught.

What is tested

  • data class Pair and User extracted as Class definitions
  • Constructor properties extracted as Field definitions
  • Constructor calls resolved from calling functions
  • Cross-file data class usage and destructuring
  • yaml_test! registration in suites.rs

How to test

cargo nextest run -p integration-tests-codegraph -E 'test(kotlin_data_classes)'

Closes #761 (closed)

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