lists.scala

来自「JAVA 语言的函数式编程扩展」· SCALA 代码 · 共 108 行

//############################################################################
// Lists
//############################################################################
// $Id: lists.scala 14110 2008-02-22 15:23:15Z michelou $

//############################################################################

import testing.SUnit._

/** Test the Scala implementation of class <code>scala.List</code>.
 *
 *  @author Stephane Micheloud
 */
object Test extends TestConsoleMain {
  def suite = new TestSuite(
    Test1, //count, exists, filter, ..
    Test2  //#468
  )
}

object Test1 extends TestCase("ctor") with Assert {
  override def enableStackTrace = false
  override def runTest {
    val xs1 = List(1, 2, 3)
    val xs2 = List('a', 'b')
    val xs3 = List(List(1, 2), List(4, 5))
    val xs4 = List(2, 4, 6, 8)
    val xs5 = List(List(3, 4), List(3), List(4, 5))

  {
    val n1 = xs1 count { e => e % 2 != 0 }
    val n2 = xs4 count { e => e < 5 }
    assertEquals("check_count", 4, n1 + n2)
  }
  /* deprecated
  {
    val ys1 = xs1 diff xs4
    val ys2 = xs3 diff xs5
    assertEquals("check_diff", 3, ys1.length + ys2.length)
  }*/
  {
    val b1 = xs1 exists { e => e % 2 == 0 }
    val b2 = xs4 exists { e => e == 5 }
    assertEquals("check_exists", false , b1 & b2)
  }
  {
    val ys1 = xs1 filter { e => e % 2 == 0 }
    val ys2 = xs4 filter { e => e < 5 }
    assertEquals("check_filter", 3, ys1.length + ys2.length)
  }
  {
    val n1 = xs1.foldLeft(0)((e1, e2) => e1 + e2)
    val ys1 = xs4.foldLeft(List[Int]())((e1, e2) => e2 :: e1)
    assertEquals("check_foldLeft", 10, n1 + ys1.length)
  }
  {
    val b1 = xs1 forall { e => e < 10}
    val b2 = xs4 forall { e => e % 2 == 0 }
    assertEquals("check_forall", true, b1 & b2)
  }
  {
    val ys1 = xs1 intersect xs4
    val ys2 = xs3 intersect xs5
    assertEquals("check_intersect", 2, ys1.length + ys2.length)
  }
  {
    val ys1 = xs1 remove { e => e % 2 != 0 }
    val ys2 = xs4 remove { e => e < 5 }
    assertEquals("check_remove", 3, ys1.length + ys2.length)
  }
  {
    val ys1 = xs1 union xs4
    val ys2 = xs3 union xs5
    assertEquals("check_union", 10, ys1.length + ys2.length)
  }
  {
    val ys1 = xs1 zip xs2
    val ys2 = xs1 zip xs3
    assertEquals("check_zip", 4, ys1.length + ys2.length)
  }
  {
    val ys1 = xs1.zipAll(xs2, 0, '_')
    val ys2 = xs2.zipAll(xs1, '_', 0)
    val ys3 = xs1.zipAll(xs3, 0, List(-1))
    assertEquals("check_zipAll", 9, ys1.length + ys2.length + ys3.length)
  }
  }
}

object Test2 extends TestCase("t0468") with Assert {
  override def enableStackTrace = false
  override def runTest {
    val xs1 = List(1, 2, 3)
    val xs2 = List(0)
 
    val ys1 = xs1 + 4
    assertEquals("check_+", List(1, 2, 3, 4), ys1)

    val ys2 = ys1 - 4
    assertEquals("check_-", xs1, ys2)

    val n2 = (xs1 ++ ys1).length
    val n3 = (xs1 ++ Nil).length
    val n4 = (xs1 ++ ((new collection.mutable.ArrayBuffer[Int]) + 0)).length
    assertEquals("check_++", 14, n2 + n3 + n4)
  }
}