From 0d3fc9de1019fcc69d3be0add555ea47f364059c Mon Sep 17 00:00:00 2001
From: Dan Abramov <dan.abramov@gmail.com>
Date: Fri, 31 Aug 2018 16:09:29 +0100
Subject: [PATCH] Add regression test for #6119

---
 .../src/__tests__/DOMPropertyOperations-test.js          | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/packages/react-dom/src/__tests__/DOMPropertyOperations-test.js b/packages/react-dom/src/__tests__/DOMPropertyOperations-test.js
index b42e4a7b1a..c4438a3bdd 100644
--- a/packages/react-dom/src/__tests__/DOMPropertyOperations-test.js
+++ b/packages/react-dom/src/__tests__/DOMPropertyOperations-test.js
@@ -139,6 +139,15 @@ describe('DOMPropertyOperations', () => {
       ReactDOM.render(<progress value="30" />, container);
       expect(container.firstChild.setAttribute).toHaveBeenCalledTimes(2);
     });
+
+    it('should return the progress to intermediate state on null value', () => {
+      const container = document.createElement('div');
+      ReactDOM.render(<progress value={30} />, container);
+      ReactDOM.render(<progress value={null} />, container);
+      // Ensure we move progress back to an indeterminate state.
+      // Regression test for https://github.com/facebook/react/issues/6119
+      expect(container.firstChild.hasAttribute('value')).toBe(false);
+    });
   });
 
   describe('deleteValueForProperty', () => {