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dmcg/KotlinArrayCastTest.kt

Last active November 7, 2015 18:27
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KotlinArrayCastTest.kt
package speed
import org.junit.Test
import kotlin.test.assertEquals
class KotlinArrayCastTest {
val strings = arrayOfNulls<String>(10000)
@Test(expected = NullPointerException::class)
fun dont_fill() {
val actuallyNotStrings : Array<String> = strings as Array<String> // IntelliJ warns "This cast can never succeed"
// but it does
}
@Test
fun fill() {
strings.fill("hello")
val definitelyStrings : Array<String> = strings as Array<String>
assertEquals("hello", definitelyStrings[0])
}
}
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