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package scala.collection
import org.junit.runner.RunWith
import org.junit.runners.JUnit4
import org.junit.Assert._
import org.junit.Test
import scala.collection.Searching._
@RunWith(classOf[JUnit4])
class SearchingTest {
@Test
def doesLinearSearchOnLinearSeqs() {
class TestSeq[A](list: List[A]) extends SeqLike[A, TestSeq[A]] {
var elementsAccessed = Set.empty[Int]
protected[this] def newBuilder = ??? // not needed for this test
def seq = list
def iterator = list.iterator
def length = list.length
def apply(idx: Int) = { elementsAccessed += idx; list(idx) }
}
val coll = new TestSeq((0 to 6).toList)
assertEquals(Found(5), coll.search(5))
assertEquals(Set.empty, coll.elementsAccessed) // linear search should not access elements via apply()
}
@Test
def doesBinarySearchOnIndexedSeqs() {
class TestIndexedSeq[A](vec: Vector[A]) extends IndexedSeqLike[A, TestIndexedSeq[A]] {
var elementsAccessed = Set.empty[Int]
protected[this] def newBuilder = ??? // not needed for this test
def seq = vec
def length = vec.length
def apply(idx: Int) = { elementsAccessed += idx; vec(idx) }
}
val coll = new TestIndexedSeq((0 to 6).toVector)
assertEquals(Found(5), coll.search(5))
assertEquals(Set(3, 5), coll.elementsAccessed)
}
}
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