Merge pull request #3226 from ziggystar/patch-1

add method dequeueOption to immutable.Queue

1 files changed, 28 insertions, 0 deletions

diff --git a/test/junit/scala/collection/QueueTest.scala b/test/junit/scala/collection/QueueTest.scala
new file mode 100644
index 0000000000..9a40d8fc90
--- /dev/null
+++ b/test/junit/scala/collection/QueueTest.scala
@@ -0,0 +1,28 @@
+package scala.collection.immutable
+
+import org.junit.runner.RunWith
+import org.junit.runners.JUnit4
+import org.junit.Test
+
+@RunWith(classOf[JUnit4])
+/* Tests for collection.immutable.Queue  */
+class QueueTest {
+  val emptyQueue = Queue.empty[Int]
+  val oneAdded = emptyQueue.enqueue(1)
+  val threeAdded = emptyQueue.enqueue(1 to 3)
+
+  @Test
+  def dequeueOptionOnEmpty() {
+    assert( emptyQueue.dequeueOption == None )
+  }
+
+  @Test
+  def dequeueOptionOneAdded() {
+    assert( oneAdded.dequeueOption == Some((1,emptyQueue)) )
+  }
+
+  @Test
+  def dequeueOptionThreeAdded() {
+    assert( threeAdded.dequeueOption == Some((1,Queue(2 to 3:_*))) )
+  }
+}