diff --git a/test/runtime/samples/dev-warning-missing-data-binding/main.svelte b/test/runtime/samples/dev-warning-missing-data-binding/main.svelte
index 3714351783f8..cfc7830c9048 100644
--- a/test/runtime/samples/dev-warning-missing-data-binding/main.svelte
+++ b/test/runtime/samples/dev-warning-missing-data-binding/main.svelte
@@ -1,5 +1,6 @@
 <script>
 	export let value;
+	export let value_with_default = undefined;
 </script>
 
 <input bind:value>
\ No newline at end of file
diff --git a/test/runtime/samples/dev-warning-missing-data-component/Foo.svelte b/test/runtime/samples/dev-warning-missing-data-component/Foo.svelte
index 95422444ccbe..99e26245ae3d 100644
--- a/test/runtime/samples/dev-warning-missing-data-component/Foo.svelte
+++ b/test/runtime/samples/dev-warning-missing-data-component/Foo.svelte
@@ -1,6 +1,7 @@
 <script>
 	export let x;
 	export let y;
+	export let z = undefined;
 </script>
 
 <div>{x} {y}</div>
\ No newline at end of file