sample.kt

inline fun <reified T : Any> setPropertyWithReflection(target: T, propertyName: String, propertyValue: Any) {
    val namespaceMemberProperty = T::class.memberProperties
        .filter { it.visibility == KVisibility.PUBLIC }
        .filterIsInstance<KMutableProperty<*>>()
        .firstOrNull { it.name == propertyName }

    if (namespaceMemberProperty == null) {
        throw NullPointerException("Failed to find '$propertyName' at '$target'.")
    }

    namespaceMemberProperty.setter.call(target, propertyValue)
}

inline fun <reified T : Any> getFunctionWithName(functionName: String): KFunction<*>? {
    return Substitution::class.declaredFunctions
        .filter { it.visibility == KVisibility.PUBLIC }
        .firstOrNull { it.name == functionName }
        .apply { this?.isAccessible = true }
}