From b12e336c8c07799656c636b96d937f6873fdcea4 Mon Sep 17 00:00:00 2001
From: Aleksandr Terentev <alvteren@gmail.com>
Date: Mon, 18 Mar 2019 19:30:58 +0300
Subject: [PATCH] fix error in hasClass when className is reqexp

---
 packages/enzyme/src/ShallowWrapper.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/enzyme/src/ShallowWrapper.js b/packages/enzyme/src/ShallowWrapper.js
index 7885e5d12..68fe38ffb 100644
--- a/packages/enzyme/src/ShallowWrapper.js
+++ b/packages/enzyme/src/ShallowWrapper.js
@@ -1253,7 +1253,7 @@ class ShallowWrapper {
    * @returns {Boolean}
    */
   hasClass(className) {
-    if (className && className.indexOf('.') !== -1) {
+    if (typeof className === 'string' && className.indexOf('.') !== -1) {
       // eslint-disable-next-line no-console
       console.warn('It looks like you\'re calling `ShallowWrapper::hasClass()` with a CSS selector. hasClass() expects a class name, not a CSS selector.');
     }