Add keyed each tests

test/runtime/samples/error-handling-keyed-each-block-reactive/_config.js

@@ -0,0 +1,10 @@
+export default {
+    async test({ assert, component, target, window }) {
+        const button = target.querySelector('button');
+        const event = new window.MouseEvent('click');
+
+        await button.dispatchEvent(event);
+
+        assert.equal(component.error, true);
+    }
+};

test/runtime/samples/error-handling-keyed-each-block-reactive/main.svelte

@@ -0,0 +1,25 @@
+<script>
+    import { onError } from "svelte";
+
+    var a = [{
+        a: {
+            b: 10
+        }
+    }];
+
+    export var error = false;
+    
+    onError(e => {
+        error = true;
+    });
+
+    function clickEvent() {
+        a = [{}];
+    }
+</script>
+
+<button on:click={clickEvent}></button>
+
+{#each a as item (item.a.b)}
+    {item}
+{/each}

test/runtime/samples/error-handling-keyed-each-block/_config.js

@@ -0,0 +1,5 @@
+export default {
+    test({ assert, component }) {
+        assert.equal(component.error, true);
+    }
+};

test/runtime/samples/error-handling-keyed-each-block/main.svelte

@@ -0,0 +1,14 @@
+<script>
+    import { onError } from "svelte";
+
+    var a = [{}]
+    export var error = false;
+    
+    onError(e => {
+        error = true;
+    });
+</script>
+
+{#each a as item (item.a.b)}
+    {item}
+{/each}