From a847d895378ff4ca4081432f4e3f221b7b8201bf Mon Sep 17 00:00:00 2001
From: NullVoxPopuli <199018+NullVoxPopuli@users.noreply.github.com>
Date: Wed, 13 Nov 2024 18:57:59 -0500
Subject: [PATCH] Create repro for
 https://github.com/emberjs/ember.js/issues/20786

---
 .../tests/plugins/assert-array-test.js         | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/packages/ember-template-compiler/tests/plugins/assert-array-test.js b/packages/ember-template-compiler/tests/plugins/assert-array-test.js
index 0e6b13a5cd1..16ad9f56045 100644
--- a/packages/ember-template-compiler/tests/plugins/assert-array-test.js
+++ b/packages/ember-template-compiler/tests/plugins/assert-array-test.js
@@ -38,5 +38,23 @@ moduleFor(
       this.assertHTML('<ul><li>2</li><li>4</li><li>6</li></ul>');
       this.assertStableRerender();
     }
+
+    ['@test survives undefined item with key'](assert) {
+      // Intentionally double all of the values to verify that this
+      // version of the `array` function is used.
+      function array(...values) {
+        return values.map((value) => value * 2);
+      }
+
+      let Root = defineComponent(
+        { array },
+        `<ul>{{#each (array undefined) key="anything" as |item|}}<li>{{item}}</li>{{/each}}</ul>`
+      );
+      this.registerComponent('root', { ComponentClass: Root });
+
+      this.render('<Root />');
+      this.assertHTML('<ul><li></li></ul>');
+      this.assertStableRerender();
+    }
   }
 );