Use isMounted instead of instance map to check if mounted

scripts/fiber/tests-failing.txt

@@ -1,9 +1,6 @@
 src/isomorphic/classic/__tests__/ReactContextValidator-test.js
 * should pass previous context to lifecycles
 
-src/renderers/__tests__/ReactComponentLifeCycle-test.js
-* should carry through each of the phases of setup
-
 src/renderers/__tests__/ReactComponentTreeHook-test.js
 * can be retrieved by ID
 

scripts/fiber/tests-passing.txt

@@ -551,6 +551,7 @@ src/renderers/__tests__/ReactComponentLifeCycle-test.js
 * should correctly determine if a null component is mounted
 * isMounted should return false when unmounted
 * warns if findDOMNode is used inside render
+* should carry through each of the phases of setup
 * should not throw when updating an auxiliary component
 * should allow state updates in componentDidMount
 * should call nested lifecycle methods in the right order

src/renderers/__tests__/ReactComponentLifeCycle-test.js

@@ -13,7 +13,6 @@
 
 var React;
 var ReactDOM;
-var ReactInstanceMap;
 var ReactTestUtils;
 
 var clone = function(o) {
@@ -78,12 +77,9 @@ type ComponentLifeCycle =
   'UNMOUNTED';
 
 function getLifeCycleState(instance): ComponentLifeCycle {
-  var internalInstance = ReactInstanceMap.get(instance);
-  // Once a component gets mounted, it has an internal instance, once it
-  // gets unmounted, it loses that internal instance.
-  return internalInstance ?
-         'MOUNTED' :
-         'UNMOUNTED';
+  return instance.updater.isMounted(instance) ?
+    'MOUNTED' :
+    'UNMOUNTED';
 }
 
 /**
@@ -99,7 +95,6 @@ describe('ReactComponentLifeCycle', () => {
     React = require('React');
     ReactDOM = require('ReactDOM');
     ReactTestUtils = require('ReactTestUtils');
-    ReactInstanceMap = require('ReactInstanceMap');
   });
 
   it('should not reuse an instance when it has been unmounted', () => {
@@ -336,6 +331,9 @@ describe('ReactComponentLifeCycle', () => {
   });
 
   it('should carry through each of the phases of setup', () => {
+    spyOn(console, 'error');
+
+
     class LifeCycleComponent extends React.Component {
       constructor(props, context) {
         super(props, context);
@@ -410,7 +408,7 @@ describe('ReactComponentLifeCycle', () => {
       instance._testJournal.returnedFromGetInitialState
     );
     expect(instance._testJournal.lifeCycleAtStartOfWillMount)
-      .toBe('MOUNTED');
+      .toBe('UNMOUNTED');
 
     // componentDidMount
     expect(instance._testJournal.stateAtStartOfDidMount)
@@ -419,11 +417,11 @@ describe('ReactComponentLifeCycle', () => {
       'MOUNTED'
     );
 
-    // render
+    // initial render
     expect(instance._testJournal.stateInInitialRender)
       .toEqual(INIT_RENDER_STATE);
     expect(instance._testJournal.lifeCycleInInitialRender).toBe(
-      'MOUNTED'
+      'UNMOUNTED'
     );
 
     expect(getLifeCycleState(instance)).toBe('MOUNTED');
@@ -452,6 +450,11 @@ describe('ReactComponentLifeCycle', () => {
     // But the current lifecycle of the component is unmounted.
     expect(getLifeCycleState(instance)).toBe('UNMOUNTED');
     expect(instance.state).toEqual(POST_WILL_UNMOUNT_STATE);
+
+    expectDev(console.error.calls.count()).toBe(1);
+    expectDev(console.error.calls.argsFor(0)[0]).toContain(
+      'LifeCycleComponent is accessing isMounted inside its render() function'
+    );
   });
 
   it('should not throw when updating an auxiliary component', () => {