From 291ae2878dd8b1886f725bba5a9928e0cec24bdb Mon Sep 17 00:00:00 2001
From: David A Kondrad <david.a.kondrad@jci.com>
Date: Thu, 12 Dec 2019 16:50:30 -0500
Subject: [PATCH] tests: runtime: add test to trap invalid dynamic event values

---
 .../event-handler-dynamic-invalid/_config.js  | 28 +++++++++++++++++++
 .../event-handler-dynamic-invalid/main.svelte | 13 +++++++++
 2 files changed, 41 insertions(+)
 create mode 100644 test/runtime/samples/event-handler-dynamic-invalid/_config.js
 create mode 100644 test/runtime/samples/event-handler-dynamic-invalid/main.svelte

diff --git a/test/runtime/samples/event-handler-dynamic-invalid/_config.js b/test/runtime/samples/event-handler-dynamic-invalid/_config.js
new file mode 100644
index 0000000000..ba1777f945
--- /dev/null
+++ b/test/runtime/samples/event-handler-dynamic-invalid/_config.js
@@ -0,0 +1,28 @@
+export default {
+	html: `<button>undef</button>
+	<button>null</button>
+	<button>invalid</button>`,
+
+	async test({ assert, component, target, window }) {
+		const [buttonUndef, buttonNull, buttonInvalid] = target.querySelectorAll(
+			'button'
+		);
+
+		const event = new window.MouseEvent('click');
+		let err = "";
+		window.addEventListener('error', (e) => {
+			e.preventDefault();
+			err = e.message;
+		});
+
+		// All three should not throw if proper checking is done in runtime code
+		await buttonUndef.dispatchEvent(event);
+		assert.equal(err, "", err);
+
+		await buttonNull.dispatchEvent(event);
+		assert.equal(err, "", err);
+
+		await buttonInvalid.dispatchEvent(event);
+		assert.equal(err, "", err);
+	},
+};
diff --git a/test/runtime/samples/event-handler-dynamic-invalid/main.svelte b/test/runtime/samples/event-handler-dynamic-invalid/main.svelte
new file mode 100644
index 0000000000..f4e8c5fdb7
--- /dev/null
+++ b/test/runtime/samples/event-handler-dynamic-invalid/main.svelte
@@ -0,0 +1,13 @@
+<script>
+	let handlerUndef;
+	let handlerNull;
+	let handlerInvalid;
+
+	handlerUndef = undefined;
+	handlerNull = null;
+	handlerInvalid = 42;
+</script>
+
+<button on:click={handlerUndef}>undef</button>
+<button on:click={handlerNull}>null</button>
+<button on:click={handlerInvalid}>invalid</button>