From ee07e8c427f6671efafc6f355149a4c810eeccbd Mon Sep 17 00:00:00 2001
From: Serhii Kulykov <iamkulykov@gmail.com>
Date: Thu, 19 Mar 2020 16:54:49 +0200
Subject: [PATCH] fix: set aria-checked properly when checked is null (#165)

Co-authored-by: Phan Hong Duc <phduc.phanhongduc@gmail.com>
---
 src/vaadin-checkbox.html | 2 +-
 test/accessibility.html  | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/vaadin-checkbox.html b/src/vaadin-checkbox.html
index 0644d9e..357c2ec 100644
--- a/src/vaadin-checkbox.html
+++ b/src/vaadin-checkbox.html
@@ -221,7 +221,7 @@
           if (this.indeterminate) {
             this.setAttribute('aria-checked', 'mixed');
           } else {
-            this.setAttribute('aria-checked', checked);
+            this.setAttribute('aria-checked', Boolean(checked));
           }
         }
 
diff --git a/test/accessibility.html b/test/accessibility.html
index fac8140..1535976 100644
--- a/test/accessibility.html
+++ b/test/accessibility.html
@@ -70,6 +70,10 @@
           expect(vaadinCheckbox.getAttribute('aria-checked')).to.be.eql('mixed');
         });
 
+        it('should set aria-checked to "false" when checked is set to null', () => {
+          vaadinCheckbox.checked = null;
+          expect(vaadinCheckbox.getAttribute('aria-checked')).to.eql('false');
+        });
       });
 
     });