1 files changed, 7 insertions, 0 deletions
diff --git a/test/acm_random.h b/test/acm_random.h
index 514894eda..84c6c7529 100644
--- a/test/acm_random.h
+++ b/test/acm_random.h
@@ -35,6 +35,13 @@ class ACMRandom {
     return (rand() >> 8) & 0xff;
   }
 
+  uint8_t Rand8Extremes(void) {
+    // Returns a random value near 0 or near 255, to better exercise
+    // saturation behavior.
+    const uint8_t r = Rand8();
+    return r < 128 ? r << 4 : r >> 4;
+  }
+
   int PseudoUniform(int range) {
     return (rand() >> 8) % range;
   }