1 files changed, 41 insertions, 0 deletions
diff --git a/src/test/scala/chiselTests/Counter.scala b/src/test/scala/chiselTests/Counter.scala
new file mode 100644
index 00000000..90e3afa3
--- /dev/null
+++ b/src/test/scala/chiselTests/Counter.scala
@@ -0,0 +1,41 @@
+package chiselTests
+import Chisel._
+import org.scalatest._
+import org.scalatest.prop._
+import Chisel.testers.BasicTester
+
+class CounterSpec extends ChiselPropSpec {
+
+  class CountTester(max: Int) extends BasicTester {
+    val cnt = Counter(max)
+    when(cnt.value === UInt(max)) { io.done := Bool(true) }
+  }
+
+  property("Counter should count up") {
+    forAll(smallPosInts) { (max: Int) => assert(execute{ new CountTester(max) }) }
+  }
+
+  class EnableTester(seed: Int) extends BasicTester {
+    val ens = Reg(init = UInt(seed))
+    ens := ens >> 1
+    val (cntEn, cntWrap) = Counter(ens(0), 32)
+    val cnt = Counter(32)
+    when(cnt.value === UInt(31)) {
+      io.done := Bool(true) 
+      io.error := cnt.value != UInt(popCount(seed))
+    }
+  }
+
+  property("Counter can be en/disabled") {
+    forAll(safeUInts) { (seed: Int) => assert(execute{ new EnableTester(seed) }) }
+  }
+
+  class WrapTester(max: Int) extends BasicTester {
+    val (cnt, wrap) = Counter(Bool(true), max)
+    when(wrap) { io.done := Bool(true); io.error := cnt != UInt(max) }
+  }
+
+  property("Counter should wrap") {
+    forAll(smallPosInts) { (max: Int) => assert(execute{ new WrapTester(max) }) }
+  }
+}