failing test for #1413

test/runtime/samples/spread-component-dynamic-undefined/_config.js

@@ -0,0 +1,19 @@
+export default {
+	data: {
+		props: {
+			a: 1,
+		},
+	},
+
+	html: ``,
+
+	test(assert, component, target) {
+		component.set({
+			props: {
+				a: 2,
+			},
+		});
+
+		assert.htmlEqual(target.innerHTML, ``);
+	},
+};

test/runtime/samples/spread-component-dynamic-undefined/main.html

@@ -0,0 +1 @@
+<svelte:component this={undefined} {...props} />