encoder_test.go | 5 +++++

diff --git a/encoder_test.go b/encoder_test.go
index 439179141b7528861a4ec293e3a35698dce1557c..ba13ea2ba9dacd2c4a3d15b15eeb160e9cdb3e66 100644
--- a/encoder_test.go
+++ b/encoder_test.go
@@ -134,10 +134,15 @@ 		err := enc.SetComplexity(complexity)
 		if err == nil {
 			t.Errorf("Expected Error invalid complexity value: %d", complexity)
 		}
+		if err.Error() != "opus: invalid argument" {
+			t.Error("Unexpected Error message")
+		}
+
 		cpx, err := enc.Complexity()
 		if err != nil {
 			t.Error("Error getting complexity value", err)
 		}
+
 		// default complexity value is 9
 		if cpx != 9 {
 			t.Errorf("Unexpected complexity value. Got %d, but expected %d",