diff --git a/squarenotsquare/__mock__/mockKeyStore.js b/squarenotsquare/__mock__/mockKeyStore.js
index c6521a5..c8fbb08 100644
--- a/squarenotsquare/__mock__/mockKeyStore.js
+++ b/squarenotsquare/__mock__/mockKeyStore.js
@@ -7,5 +7,11 @@ export async function setKey(key, value) {
 }
 
 export async function getKey(key) {
-  return '1234567890';
+  if (key === 'isNull'){
+    return null;
+  } else if (key === 'negTest') {
+    return '-1';
+  } else {
+    return '1234567890';
+  }
 }