Additional coverage for each iteration with undefined item and specif…

…ied key

packages/@glimmer-workspace/integration-tests/test/keywords/each-test.ts

@@ -0,0 +1,29 @@
+import { defineComponent, jitSuite, RenderTest, test, tracked } from '../..';
+
+class Each extends RenderTest {
+  static suiteName = '{{#each}} keyword';
+
+  @test
+  'each with undefined item https://github.com/emberjs/ember.js/issues/20786'() {
+    class State {
+      @tracked data = [undefined];
+    }
+
+    let state = new State();
+
+    const Bar = defineComponent(
+      { state },
+      `{{#each state.data key='anything' as |datum|}}
+        {{datum}}
+       {{/each}}`
+        .replaceAll(/^\s|\s+$|\s+(?=\s)/gu, '')
+        .replaceAll(/\n/gu, '')
+    );
+
+    this.renderComponent(Bar);
+
+    this.assertHTML('  ');
+  }
+}
+
+jitSuite(Each);