Added test

test/runtime/samples/binding-this-function/Foo.svelte

@@ -0,0 +1,9 @@
+<script>
+    let clicked = "False";
+    export function click() {
+        clicked = "True";
+    }
+</script>
+
+
+<p>{clicked}</p>

test/runtime/samples/binding-this-function/_config.js

@@ -0,0 +1,10 @@
+export default {
+	async test({ assert, target, window }) {
+		const button = target.querySelector('button');
+		const p = target.querySelector('p');
+		const eventClick = new window.MouseEvent('click');
+		
+		await button.dispatchEvent(eventClick);
+		assert.htmlEqual(p.innerHTML, 'True');
+	}
+};

test/runtime/samples/binding-this-function/main.svelte

@@ -0,0 +1,7 @@
+<script>
+	import Foo from './Foo.svelte';
+	export let foo;
+</script>
+
+<button on:click={foo.click} />
+<Foo bind:this={foo} />