diff --git a/tests/datamodule.test.js b/tests/datamodule.test.js
index 8472d4b0..c9552127 100644
--- a/tests/datamodule.test.js
+++ b/tests/datamodule.test.js
@@ -12,6 +12,7 @@ describe('#addProperties', function(){
     document.dispatchEvent(new KeyboardEvent('keydown', {keyCode: 32}));
     document.dispatchEvent(new KeyboardEvent('keyup', {keyCode: 32}));
     // check if data contains testprop
+    expect(jsPsych.data.getData().select('rt').count()).toBe(1);
     expect(jsPsych.data.getData().select('testprop').count()).toBe(1);
   });
 })