Kotlin Idioms

Project-specific Kotlin choices. The model already knows data class, ?., when — this skill is the calls this project makes when Kotlin offers two reasonable options, plus the JVM/Spring gotchas worth pinning.

Formatter is ktfmt Google style via Spotless (./gradlew spotlessApply).

Imports — no wildcards

Always explicit, one symbol per line. Even past 5 members.

// CORRECT
import org.junit.jupiter.api.Assertions.assertEquals
import org.junit.jupiter.api.Assertions.assertNotNull

// WRONG
import org.junit.jupiter.api.Assertions.*