How to use dependency injection in Spek tests

I am implementing simple microservice using Kotlin, Spring and Spek. I want to test my repository but I wonder how can I inject repo into spek test case. Every example or tutorial base on creating new reference like this:

object SampleTest : Spek({
    describe("a calculator") {
        val calculator = SampleCalculator()

        it("should return the result of adding the first number to the second number") {
            val sum = calculator.sum(2, 4)
            assertEquals(6, sum)
        }

        it("should return the result of subtracting the second number from the first number") {
            val subtract = calculator.subtract(4, 2)
            assertEquals(2, subtract)
        }
    }
})

To summup I dont want to do sth like this:

val calculator = SampleCalculator()

I want to achieve this

@Autowired
val calculator: SampleCalculator

but I cant to that becasue I cant autowire service into local variable.. Any solutions ? I am new in kotlin and spek.