diff --git a/src/file/drawing/floating/vertical-position.spec.ts b/src/file/drawing/floating/vertical-position.spec.ts
index 20f4cbe62a..29c69b5bdc 100644
--- a/src/file/drawing/floating/vertical-position.spec.ts
+++ b/src/file/drawing/floating/vertical-position.spec.ts
@@ -49,5 +49,9 @@ describe("VerticalPosition", () => {
                 ],
             });
         });
+
+        it("should require one of align or offset", () => {
+            expect(() => new VerticalPosition({})).to.throw();
+        });
     });
 });