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diff --git a/src/test/scala/chiselTests/ChiselSpec.scala b/src/test/scala/chiselTests/ChiselSpec.scala
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+/*
+ Copyright (c) 2011-2015 The Regents of the University of
+ California (Regents). All Rights Reserved.  Redistribution and use in
+ source and binary forms, with or without modification, are permitted
+ provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above
+      copyright notice, this list of conditions and the following
+      two paragraphs of disclaimer.
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      two paragraphs of disclaimer in the documentation and/or other materials
+      provided with the distribution.
+    * Neither the name of the Regents nor the names of its contributors
+      may be used to endorse or promote products derived from this
+      software without specific prior written permission.
+
+ IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
+ SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS,
+ ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
+ REGENTS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+ REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF
+ ANY, PROVIDED HEREUNDER IS PROVIDED "AS IS". REGENTS HAS NO OBLIGATION
+ TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR
+ MODIFICATIONS.
+*/
+
+package chiselTests
+
+import org.scalatest._
+import org.scalatest.prop._
+import org.scalacheck._
+
+class ChiselSpec extends FlatSpec with PropertyChecks {
+
+  val safeUIntWidth = Gen.choose(1, 31) 
+  val safeUInts = Gen.choose(0, (1 << 30))
+
+}
+