Fix ReactTestInstance::toJSON() with empty top-level components (#7523)

(cherry picked from commit 9f5b009)
facebook · Aug 19, 2016 · f120c1b · f120c1b
1 parent 421bb8c
commit f120c1b
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diff --git a/src/renderers/testing/ReactTestMount.js b/src/renderers/testing/ReactTestMount.js
@@ -127,6 +127,9 @@ ReactTestInstance.prototype.unmount = function(nextElement) {
 };
 ReactTestInstance.prototype.toJSON = function() {
   var inst = getHostComponentFromComposite(this._component);
+  if (inst === null) {
+    return null;
+  }
   return inst.toJSON();
 };
 

diff --git a/src/renderers/testing/__tests__/ReactTestRenderer-test.js b/src/renderers/testing/__tests__/ReactTestRenderer-test.js
@@ -28,6 +28,14 @@ describe('ReactTestRenderer', function() {
     });
   });
 
+  it('renders a top-level empty component', function() {
+    function Empty() {
+      return null;
+    }
+    var renderer = ReactTestRenderer.create(<Empty />);
+    expect(renderer.toJSON()).toEqual(null);
+  });
+
   it('exposes a type flag', function() {
     function Link() {
       return <a role="link" />;