diff --git a/ui/src/__tests__/rectangle.spec.ts b/ui/src/__tests__/rectangle.spec.ts
index 14c8b17..46eb5e6 100644
--- a/ui/src/__tests__/rectangle.spec.ts
+++ b/ui/src/__tests__/rectangle.spec.ts
@@ -29,14 +29,17 @@ describe("Rectangle Tests", () => {
   }
 
   it("should create a default rectangle", () => {
+    expect.hasAssertions();
     check_rectangle(new Rectangle(), 0, 0, 0, 0);
   });
 
   it("should create a rectangle", () => {
+    expect.hasAssertions();
     check_rectangle(r1, 1, 2, 3, 4);
   });
 
   it("should create the same rectangle backwards", () => {
+    expect.hasAssertions();
     check_rectangle(r2, 1, 2, 3, 4);
   });
 
@@ -67,6 +70,7 @@ describe("Rectangle Tests", () => {
   });
 
   it("should update a rectangle", () => {
+    expect.hasAssertions();
     const v = new Vector2D(1, 1);
 
     check_rectangle(r1.update(v1.plus(v), undefined), 2, 3, 2, 3);
@@ -83,6 +87,7 @@ describe("Rectangle Tests", () => {
   });
 
   it("should move a rectangle", () => {
+    expect.hasAssertions();
     const v = new Vector2D(1, 1);
 
     check_rectangle(r1.move(v), 2, 3, 3, 4);