SI-9072 Vector ++ concatenation of parallel collection cause inconsistent results

1 files changed, 20 insertions, 0 deletions

diff --git a/test/junit/scala/collection/immutable/VectorTest.scala b/test/junit/scala/collection/immutable/VectorTest.scala
new file mode 100644
index 0000000000..e7edba3e43
--- /dev/null
+++ b/test/junit/scala/collection/immutable/VectorTest.scala
@@ -0,0 +1,20 @@
+package scala.collection.immutable
+
+import org.junit.{Assert, Test}
+import org.junit.runner.RunWith
+import org.junit.runners.JUnit4
+
+@RunWith(classOf[JUnit4])
+class VectorTest {
+  /**
+   * Test Vector ++ with a small parallel collection concatenation (SI-9072).
+   *
+   */
+  @Test
+  def testPlusPlus(): Unit = {
+    val smallVec = (0 to 1)
+    val smallParVec = smallVec.par
+    val testElementsSize = (0 to 1000).map( _ => Vector.empty ++ smallParVec )
+    Assert.assertTrue(testElementsSize.forall( v => v.size == 2 ))
+  }
+}