package scala.lang.primitives import org.junit.Assert._ import org.junit.Test import org.junit.runner.RunWith import org.junit.runners.JUnit4 import scala.tools.testing.RunTesting object BoxUnboxTest { class VCI(val x: Int) extends AnyVal { override def toString = "" + x } } @RunWith(classOf[JUnit4]) class BoxUnboxTest extends RunTesting { import runner._ @Test def boxUnboxInt(): Unit = { import scala.tools.testing.AssertUtil._ import org.junit.Assert._ def genericNull[T] = null.asInstanceOf[T] // allowed, see SI-4437, point 2 val b = new Integer(1) val u = 1 assertEquals(1.toInt, u) assertEquals(Predef.int2Integer(1), b) assertEquals(1: Integer, b) assertEquals(Int.box(1), b) assertEquals(1.asInstanceOf[Object], b) assertThrows[ClassCastException]("".asInstanceOf[Integer]) assertEquals(Predef.Integer2int(b), u) assertEquals(b: Int, u) assertEquals(Int.unbox(b), u) assertEquals(b.asInstanceOf[Int], u) assertEquals(b.intValue, u) assertEquals(b.toInt, u) intWrapper(b).toInt assertThrows[ClassCastException](Int.unbox("")) assertThrows[ClassCastException]("".asInstanceOf[Int]) // null unboxing in various positions val n1 = Int.unbox(null) assertEquals(n1, 0) val n2 = Predef.Integer2int(null) assertEquals(n2, 0) val n3 = (null: Integer): Int assertEquals(n3, 0) val n4 = null.asInstanceOf[Int] assertEquals(n4, 0) val n5 = null.asInstanceOf[Int] == 0 assertTrue(n5) val n6 = null.asInstanceOf[Int] == null assertFalse(n6) val n7 = null.asInstanceOf[Int] != 0 assertFalse(n7) val n8 = null.asInstanceOf[Int] != null assertTrue(n8) val mp = new java.util.HashMap[Int, Int] val n9 = mp.get(0) assertEquals(n9, 0) val n10 = mp.get(0) == null // SI-602 assertThrows[AssertionError](assertFalse(n10)) // should not throw def f(a: Any) = "" + a val n11 = f(null.asInstanceOf[Int]) assertEquals(n11, "0") def n12 = genericNull[Int] assertEquals(n12, 0) } @Test def numericConversions(): Unit = { import scala.tools.testing.AssertUtil._ import org.junit.Assert._ val i1 = 1L.asInstanceOf[Int] assertEquals(i1, 1) assertThrows[ClassCastException] { val i2 = (1L: Any).asInstanceOf[Int] // SI-1448, should not throw. see also SI-4437 point 1. assertEquals(i2, 1) } } @Test def boxUnboxBoolean(): Unit = { val n1 = Option(null.asInstanceOf[Boolean]) assertEquals(n1, Some(false)) } @Test def boxUnboxUnit(): Unit = { // should not use assertEquals in this test: it takes two Object parameters. normally, Unit does // not conform to Object, but for Java-defined methods scalac makes an exception and treats them // as Any. passing a Unit as Any makes the compiler go through another layer of boxing, so it // can hide some bugs (where we actually have a null, but the compiler makes it a ()). import scala.tools.testing.AssertUtil._ import org.junit.Assert._ var v = 0 def eff() = { v = 1 } def chk() = { assert(v == 1); v = 0 } val b = runtime.BoxedUnit.UNIT assert(eff() == b); chk() assert(Unit.box(eff()) == b); chk() assert(().asInstanceOf[Object] == b) Unit.unbox({eff(); b}); chk() Unit.unbox({eff(); null}); chk() assertThrows[ClassCastException](Unit.unbox({eff(); ""})); chk() val n1 = null.asInstanceOf[Unit] assert(n1 == b) val n2 = null.asInstanceOf[Unit] == b assert(n2) def f(a: Any) = "" + a val n3 = f(null.asInstanceOf[Unit]) assertEquals(n3, "()") } @Test def t9671(): Unit = { import scala.lang.primitives.BoxUnboxTest.VCI def f1(a: Any) = "" + a def f2(a: AnyVal) = "" + a def f3[T](a: T) = "" + a def f4(a: Int) = "" + a def f5(a: VCI) = "" + a def f6(u: Unit) = "" + u def n1: AnyRef = null def n2: Null = null def n3: Any = null def n4[T]: T = null.asInstanceOf[T] def npe(s: => String) = try { s; throw new Error() } catch { case _: NullPointerException => "npe" } val result = f1(null.asInstanceOf[Int]) + f1( n1.asInstanceOf[Int]) + f1( n2.asInstanceOf[Int]) + f1( n3.asInstanceOf[Int]) + f1( n4[Int]) + // "null" "-" + f1(null.asInstanceOf[VCI]) + npe(f1( n1.asInstanceOf[VCI])) + // SI-8097 f1( n2.asInstanceOf[VCI]) + npe(f1( n3.asInstanceOf[VCI])) + // SI-8097 f1( n4[VCI]) + // "null" "-" + f1(null.asInstanceOf[Unit]) + f1( n1.asInstanceOf[Unit]) + f1( n2.asInstanceOf[Unit]) + f1( n3.asInstanceOf[Unit]) + f1( n4[Unit]) + // "null" "-" + f2(null.asInstanceOf[Int]) + f2( n1.asInstanceOf[Int]) + f2( n2.asInstanceOf[Int]) + f2( n3.asInstanceOf[Int]) + f2( n4[Int]) + // "null" "-" + f2(null.asInstanceOf[VCI]) + npe(f2( n1.asInstanceOf[VCI])) + // SI-8097 f2( n2.asInstanceOf[VCI]) + npe(f2( n3.asInstanceOf[VCI])) + // SI-8097 f2( n4[VCI]) + // "null" "-" + f2(null.asInstanceOf[Unit]) + f2( n1.asInstanceOf[Unit]) + f2( n2.asInstanceOf[Unit]) + f2( n3.asInstanceOf[Unit]) + f2( n4[Unit]) + // "null" "-" + f3(null.asInstanceOf[Int]) + f3( n1.asInstanceOf[Int]) + f3( n2.asInstanceOf[Int]) + f3( n3.asInstanceOf[Int]) + f3( n4[Int]) + // "null" "-" + f3(null.asInstanceOf[VCI]) + npe(f3( n1.asInstanceOf[VCI])) + // SI-8097 f3( n2.asInstanceOf[VCI]) + npe(f3( n3.asInstanceOf[VCI])) + // SI-8097 f3( n4[VCI]) + // "null" "-" + f3(null.asInstanceOf[Unit]) + f3( n1.asInstanceOf[Unit]) + f3( n2.asInstanceOf[Unit]) + f3( n3.asInstanceOf[Unit]) + f3( n4[Unit]) + // "null" "-" + f4(null.asInstanceOf[Int]) + f4( n1.asInstanceOf[Int]) + f4( n2.asInstanceOf[Int]) + f4( n3.asInstanceOf[Int]) + f4( n4[Int]) + "-" + f5(null.asInstanceOf[VCI]) + npe(f5( n1.asInstanceOf[VCI])) + // SI-8097 f5( n2.asInstanceOf[VCI]) + npe(f5( n3.asInstanceOf[VCI])) + // SI-8097 npe(f5( n4[VCI])) + // SI-8097 "-" + f6(null.asInstanceOf[Unit]) + f6( n1.asInstanceOf[Unit]) + f6( n2.asInstanceOf[Unit]) + f6( n3.asInstanceOf[Unit]) + f6( n4[Unit]) // "null" assertEquals(result, "0000null-0npe0npenull-()()()()null-0000null-0npe0npenull-()()()()null-0000null-0npe0npenull-()()()()null-00000-0npe0npenpe-()()()()null") } }