diff --git a/tests/helpers/run.js b/tests/helpers/run.js
index <HASH>..<HASH> 100644
--- a/tests/helpers/run.js
+++ b/tests/helpers/run.js
@@ -30,7 +30,7 @@ const bootstrap = () =>
 module.exports = (...args) =>
   bootstrap().then((rootDir) => {
     process.chdir(rootDir);
-    process.nextTick(() => run(null, ...args));
+    process.nextTick(() => run(...args));
 
     const { events } = require(join(rootDir, 'core'));
     const api = {
test: use new yargs API