From 55f597b1b8f45feed38e06da2f6f313611613248 Mon Sep 17 00:00:00 2001
From: Pshenkin Andrey <a.pshenkin@rambler-co.ru>
Date: Fri, 1 Dec 2017 11:58:01 +0300
Subject: [PATCH] fix displaying undefined args in output

---
 lib/step.js             | 2 ++
 test/unit/steps_test.js | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/lib/step.js b/lib/step.js
index 03623b199..4b11db0de 100644
--- a/lib/step.js
+++ b/lib/step.js
@@ -57,6 +57,8 @@ class Step {
         return arg.toString();
       } else if (typeof arg === "object") {
         return JSON.stringify(arg);
+      } else if (typeof arg === "undefined") {
+        return `${arg}`;
       } else if (arg.toString) {
         return arg.toString();
       }
diff --git a/test/unit/steps_test.js b/test/unit/steps_test.js
index 7d5df4160..1645c772b 100644
--- a/test/unit/steps_test.js
+++ b/test/unit/steps_test.js
@@ -29,6 +29,10 @@ describe('Step', () => {
 
     step.args = [{css: '.class'}];
     step.humanizeArgs().should.eql('{"css":".class"}');
+
+    let testUndefined;
+    step.args = [testUndefined, 'undefined'];
+    step.humanizeArgs().should.eql('undefined, "undefined');
   });
 
   it('should provide nice output', () => {