Reject negative shift amounts; add tests (#730)

Closes #729

1 files changed, 4 insertions, 0 deletions

diff --git a/src/test/scala/chiselTests/SIntOps.scala b/src/test/scala/chiselTests/SIntOps.scala
index 900eb074..a9b75446 100644
--- a/src/test/scala/chiselTests/SIntOps.scala
+++ b/src/test/scala/chiselTests/SIntOps.scala
@@ -89,5 +89,9 @@ class SIntOpsSpec extends ChiselPropSpec {
     elaborate { new SIntOps }
   }
 
+  property("Negative shift amounts are invalid") {
+    a [ChiselException] should be thrownBy { elaborate(new NegativeShift(SInt())) }
+  }
+
   ignore("SIntOpsTester should return the correct result") { }
 }