Fix bug where backdrop calls method on null if it is already removed from the body (#34014)

Co-authored-by: Rohit Sharma <rohit2sharma95@gmail.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/js/tests/unit/util/backdrop.spec.js b/js/tests/unit/util/backdrop.spec.js
index ae342b0929..02dea5a25b 100644
--- a/js/tests/unit/util/backdrop.spec.js
+++ b/js/tests/unit/util/backdrop.spec.js
@@ -129,6 +129,25 @@ describe('Backdrop', () => {
     })
   })
 
+  it('should not error if the backdrop no longer has a parent', done => {
+    const instance = new Backdrop({
+      isVisible: true,
+      isAnimated: true
+    })
+    const getElements = () => document.querySelectorAll(CLASS_BACKDROP)
+
+    instance.show(() => {
+      instance.hide(() => {
+        expect(getElements().length).toEqual(0)
+
+        // replace the fixture, which was just wiped out
+        fixtureEl = getFixture()
+        done()
+      })
+      document.body.innerHTML = 'changed'
+    })
+  })
+
   describe('click callback', () => {
     it('it should execute callback on click', done => {
       const spy = jasmine.createSpy('spy')