Add test for unmount/remount in a single batch (#8470)

Fails in Fiber.
facebook · Dec 1, 2016 · 361ce5c · 361ce5c · zzz6519003 · Dec 2, 2016
1 parent df9dc89
commit 361ce5c
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diff --git a/scripts/fiber/tests-failing.txt b/scripts/fiber/tests-failing.txt
@@ -115,6 +115,7 @@ src/renderers/shared/shared/__tests__/ReactUpdates-test.js
 * throws in setState if the update callback is not a function
 * throws in replaceState if the update callback is not a function
 * throws in forceUpdate if the update callback is not a function
+* unmounts and remounts a root in the same batch
 
 src/renderers/shared/shared/__tests__/refs-test.js
 * Should increase refs with an increase in divs

diff --git a/src/renderers/shared/shared/__tests__/ReactUpdates-test.js b/src/renderers/shared/shared/__tests__/ReactUpdates-test.js
@@ -1081,4 +1081,14 @@ describe('ReactUpdates', () => {
     });
     expect(result).toEqual(42);
   });
+
+  it('unmounts and remounts a root in the same batch', () => {
+    var container = document.createElement('div');
+    ReactDOM.render(<span>a</span>, container);
+    ReactDOM.unstable_batchedUpdates(function() {
+      ReactDOM.unmountComponentAtNode(container);
+      ReactDOM.render(<span>b</span>, container);
+    });
+    expect(container.textContent).toBe('b');
+  });
 });