Room FloatList converter

RoomFloatListTypeConverter.kt

import android.arch.persistence.room.TypeConverter

class FloatConverter {
    @TypeConverter
    fun stringToListOfFloat(value: String): List<Float> {
        return value.split(",").map { it.toFloat() }
    }

    @TypeConverter
    fun listOfFloatToString(list: List<Float>): String {
        return list.joinToString(",")
    }
}

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==============TEST================
==================================

import org.hamcrest.Matchers.`is`
import org.junit.Assert.assertEquals
import org.junit.Assert.assertThat
import org.junit.Test

class FloatConverterTest {
    @Test
    fun stringToListOfFloat() {
        val numbers = "1, 2, 2.2, 20"
        val expected = listOf(1F, 2F, 2.2F, 20F)
        assertThat(FloatConverter().stringToListOfFloat(numbers), `is`(expected))
    }

    @Test
    fun listOfFloatToString() {
        val floatList = listOf(1F, 2F, 2.2F, 20F)
        val expected = "1.0,2.0,2.2,20.0"
        assertEquals(expected, FloatConverter().listOfFloatToString(floatList))
    }
}