diff --git a/packages/utils/src/assert.spec.ts b/packages/utils/src/assert.spec.ts
index 2631596b..4defd936 100644
--- a/packages/utils/src/assert.spec.ts
+++ b/packages/utils/src/assert.spec.ts
@@ -10,6 +10,11 @@ describe("assert", () => {
     it('assert should throw an error with default message when condition is falsy', () => {
       expect(() => assert(false)).toThrowError("condition is not truthy");
     });
+
+    it('assert should throw an error with custom message when condition is falsy', () => {
+      const errorMessage = "Custom error message";
+      expect(() => assert(false, errorMessage)).toThrowError(errorMessage);
+    });
   });
 
   describe("assertDefined", () => {