From b4bb38666780e4751c155b4349976663f522587f Mon Sep 17 00:00:00 2001
From: Conduitry <git@chor.date>
Date: Sun, 9 Feb 2020 09:14:46 -0500
Subject: [PATCH] add test

---
 .../_config.js                                | 31 +++++++++++++++++++
 .../main.svelte                               | 14 +++++++++
 2 files changed, 45 insertions(+)
 create mode 100644 test/runtime/samples/instrumentation-update-expression/_config.js
 create mode 100644 test/runtime/samples/instrumentation-update-expression/main.svelte

diff --git a/test/runtime/samples/instrumentation-update-expression/_config.js b/test/runtime/samples/instrumentation-update-expression/_config.js
new file mode 100644
index 0000000000..cc33422f6f
--- /dev/null
+++ b/test/runtime/samples/instrumentation-update-expression/_config.js
@@ -0,0 +1,31 @@
+export default {
+	html: `
+		<p>0</p>
+		<button>foo++</button>
+		<button>++foo</button>
+		<p>0</p>
+		<button>bar.bar++</button>
+		<button>++bar.bar</button>
+	`,
+	async test({ assert, target, window }) {
+		const [foo, bar] = target.querySelectorAll('p');
+		const [button1, button2, button3, button4] = target.querySelectorAll('button');
+		const event = new window.MouseEvent('click');
+
+		await button1.dispatchEvent(event);
+		assert.equal(foo.innerHTML, '1');
+		assert.equal(bar.innerHTML, '0');
+
+		await button2.dispatchEvent(event);
+		assert.equal(foo.innerHTML, '2');
+		assert.equal(bar.innerHTML, '0');
+
+		await button3.dispatchEvent(event);
+		assert.equal(foo.innerHTML, '2');
+		assert.equal(bar.innerHTML, '1');
+
+		await button4.dispatchEvent(event);
+		assert.equal(foo.innerHTML, '2');
+		assert.equal(bar.innerHTML, '2');
+	}
+};
diff --git a/test/runtime/samples/instrumentation-update-expression/main.svelte b/test/runtime/samples/instrumentation-update-expression/main.svelte
new file mode 100644
index 0000000000..0672f6330d
--- /dev/null
+++ b/test/runtime/samples/instrumentation-update-expression/main.svelte
@@ -0,0 +1,14 @@
+<script>
+	let foo = 0;
+	let bar = { bar: 0 };
+</script>
+
+<p>{foo}</p>
+
+<button on:click={() => foo++}>foo++</button>
+<button on:click={() => ++foo}>++foo</button>
+
+<p>{bar.bar}</p>
+
+<button on:click={() => bar.bar++}>bar.bar++</button>
+<button on:click={() => ++bar.bar}>++bar.bar</button>