Test Scheduler using Kotlin and SpringFramework - tested for Target JVM 1.8

TestScheduler.kt

package com.example.org.schedules

import com.example.org.services.ConstructorInjection
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty
import org.springframework.scheduling.annotation.EnableScheduling
import org.springframework.scheduling.annotation.Scheduled
import org.springframework.stereotype.Component

/**
 * TestScheduler to schedule a method to run with fixedDelay
 * The class should be open for EnableScheduling to work
 */
@Component
@ConditionalOnProperty("schedules.test-scheduler.enabled") // optional
@EnableScheduling
open class TestScheduler(private val constructorInjection: ConstructorInjection) {

    /**
     * The function should be open for the Scheduling to work correctly
     * NOTE: This won't throw an error/exception otherwise
     * It's just the constructorInjection would be null if used inside this function
     * and one would waste lot of time finding why
     */
    @Scheduled(fixedDelay = DELAY_IN_MS)
    open fun runWithDelay() {
        constructorInjection.someMethod()
    }

    companion object {
        // fixedDelay of 30 secs - Provide delay as a constant in companion object can directly hardcode too
        const val DELAY_IN_MS = 30000L 
    }
}