Merge pull request #3795 from som-snytt/issue/8475

SI-8475 GroupedIterator is also lazy when padded

1 files changed, 8 insertions, 0 deletions

diff --git a/test/junit/scala/collection/IteratorTest.scala b/test/junit/scala/collection/IteratorTest.scala
index cb7cbb40bc..b7a9805c9f 100644
--- a/test/junit/scala/collection/IteratorTest.scala
+++ b/test/junit/scala/collection/IteratorTest.scala
@@ -17,4 +17,12 @@ class IteratorTest {
     slidingIt.next
     assertEquals("Counter should be one, that means we didn't look further than needed", 1, counter)
   }
+
+  @Test def groupedIteratorIsLazyWhenPadded(): Unit = {
+    var counter = 0
+    def it = new Iterator[Int] { var i = 0 ; def hasNext = { counter = i; true } ; def next = { i += 1; i } }
+    val slidingIt = it sliding 2 withPadding -1
+    slidingIt.next
+    assertEquals("Counter should be one, that means we didn't look further than needed", 1, counter)
+  }
 }