diff --git a/test/runtime.mjs b/test/runtime.mjs
index 19b716274..75105fbe1 100644
--- a/test/runtime.mjs
+++ b/test/runtime.mjs
@@ -77,6 +77,9 @@ const toneHelpersMocked = {
 strudel.Pattern.prototype.osc = function () {
   return this;
 };
+strudel.Pattern.prototype.uniform = function () {
+  return this;
+};
 strudel.Pattern.prototype.csound = function () {
   return this;
 };