add failing test for each block updates

test/runtime/samples/each-block-destructured-array/_config.js

@@ -9,5 +9,12 @@ export default {
 	html: `
 		<p>raccoon: hands</p>
 		<p>eagle: wings</p>
-	`
+	`,
+
+	test ( assert, component, target ) {
+		component.set({ animalPawsEntries: [['foo', 'bar']] });
+		assert.htmlEqual( target.innerHTML, `
+			<p>foo: bar</p>
+		`);
+	},
 };