Creating direct FloatBuffer from List<Float>

DirectFloatBuffer.kt

import java.nio.ByteBuffer
import java.nio.ByteOrder
import java.nio.FloatBuffer

private const val FLOAT_BYTES = 4

fun List<Float>.toDirectFloatBuffer(): FloatBuffer =
    ByteBuffer.allocateDirect(size * FLOAT_BYTES)
        .apply { order(ByteOrder.nativeOrder()) }
        .asFloatBuffer()
        .put(toFloatArray())
        .apply { rewind() }

DirectFloatBufferTest.kt

import org.junit.jupiter.api.Assertions.assertEquals
import org.junit.jupiter.api.Assertions.assertTrue
import org.junit.jupiter.api.DisplayName
import org.junit.jupiter.api.Test
import org.junit.jupiter.api.assertAll

@DisplayName(value = "Creating direct FloatBuffer")
class FloatBufferTest {

    @Test
    @DisplayName(value = "GIVEN list of floats, WHEN toDirectFloatBuffer, THEN return direct buffer of floats")
    fun toDirectFloatBuffer() {
        val list = listOf(1f, 2f, 3f)

        val result = list.toDirectFloatBuffer()

        assertAll(
            "buffer",
            { assertTrue(result.isDirect) },
            { assertEquals(3, result.capacity()) },
            { assertEquals(1f, result[0]) },
            { assertEquals(2f, result[1]) },
            { assertEquals(3f, result[2]) }
        )
    }
}