diff --git a/src/internal/modalManager.spec.js b/src/internal/modalManager.spec.js
index <HASH>..<HASH> 100644
--- a/src/internal/modalManager.spec.js
+++ b/src/internal/modalManager.spec.js
@@ -71,5 +71,10 @@ describe('internal/modalManager', () => {
       const idx = modalManager.remove(modal1);
       assert.strictEqual(idx, 0, 'should be the "first" modal');
     });
+
+    it('should not do anything', () => {
+      const idx = modalManager.remove({ nonExisting: true });
+      assert.strictEqual(idx, -1, 'should not find the non existing modal');
+    });
   });
 });
Add test coverage for removal of non-exiting modal in ModalManager (#<I>)