From 9c2cb8c621b5db35f23bdb40f0a8d202d1642339 Mon Sep 17 00:00:00 2001
From: Tobias Bieniek <tobias.bieniek@gmail.com>
Date: Thu, 19 Apr 2018 15:48:50 +0200
Subject: [PATCH] isDisabled: Throw errors for unexpected element types

---
 lib/assertions/is-disabled.js | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/lib/assertions/is-disabled.js b/lib/assertions/is-disabled.js
index a9ff2c45c..b850470ea 100644
--- a/lib/assertions/is-disabled.js
+++ b/lib/assertions/is-disabled.js
@@ -2,15 +2,24 @@ export default function isDisabled(message) {
   let element = this.findTargetElement();
   if (!element) return;
 
+  if (!(
+      element instanceof HTMLInputElement ||
+      element instanceof HTMLTextAreaElement ||
+      element instanceof HTMLSelectElement ||
+      element instanceof HTMLButtonElement ||
+      element instanceof HTMLOptGroupElement ||
+      element instanceof HTMLOptionElement ||
+      element instanceof HTMLFieldSetElement
+    )) {
+    throw new TypeError(`Unexpected Element Type: ${element.toString()}`);
+  }
+
   let expected = `Element ${this.targetDescription} is disabled`;
   let actual = `Element ${this.targetDescription} is disabled`;
   let result = element.disabled;
 
   if (result === false) {
     actual = `Element ${this.targetDescription} is not disabled`;
-  } else if(result === undefined) {
-    actual = `Element ${this.targetDescription} does not support disabled`;
-    result = false;
   }
 
   if (!message) {