From 6ef64ea4a070e83430e1a9ae7d76b8208bf55890 Mon Sep 17 00:00:00 2001
From: Sebastian Silbermann <silbermann.sebastian@gmail.com>
Date: Wed, 15 Jul 2020 14:12:27 +0200
Subject: [PATCH] fix(unmount): Flush useEffect cleanup functions syncronously

---
 src/__tests__/render.js | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/__tests__/render.js b/src/__tests__/render.js
index 54916ba4..4e78afa6 100644
--- a/src/__tests__/render.js
+++ b/src/__tests__/render.js
@@ -87,3 +87,17 @@ test('renders options.wrapper around node', () => {
 </div>
 `)
 })
+
+test('flushes useEffect cleanup functions sync on unmount()', () => {
+  const spy = jest.fn()
+  function Component() {
+    React.useEffect(() => spy, [])
+    return null
+  }
+  const {unmount} = render(<Component />)
+  expect(spy).toHaveBeenCalledTimes(0)
+
+  unmount()
+
+  expect(spy).toHaveBeenCalledTimes(1)
+})