Update warn message and move it to the error-catching block

src/renderers/shared/reconciler/ReactCompositeComponent.js

@@ -194,6 +194,13 @@ var ReactCompositeComponentMixin = {
         'expected to return a value.',
         (this.getName() || 'A component')
       );
+      warning(
+        typeof inst.componentDidUnmount !== 'function',
+        '%s has a method called ' +
+        'componentDidUnmount(). But there is no such lifecycle method. ' +
+        'Did you mean componentWillUnmount()?',
+        this.getName() || 'A component'
+      );
       warning(
         typeof inst.componentWillRecieveProps !== 'function',
         '%s has a method called ' +
@@ -257,14 +264,6 @@ var ReactCompositeComponentMixin = {
     if (inst.componentWillUnmount) {
       inst.componentWillUnmount();
     }
-    if (__DEV__) {
-      warning(
-        typeof inst.componentDidUnmount !== 'function',
-        'componentDidUnmount was defined on %s. But there is no such ' +
-        'lifecycle method. Use componentWillUnmount instead.',
-        this.getName() || 'ReactCompositeComponent'
-      );
-    }
 
     ReactReconciler.unmountComponent(this._renderedComponent);
     this._renderedComponent = null;

src/renderers/shared/reconciler/__tests__/ReactCompositeComponent-test.js

@@ -552,10 +552,7 @@ describe('ReactCompositeComponent', function() {
     );
   });
 
-  it('should warn when defined method componentDidUnmount', function() {
-    var container = document.createElement('div');
-    document.body.appendChild(container);
-
+  it('should warn when componentDidUnmount method is defined', function() {
     var Component = React.createClass({
       componentDidUnmount: function() {
       },
@@ -565,17 +562,13 @@ describe('ReactCompositeComponent', function() {
       },
     });
 
-    var instance = <Component />;
-
-    instance = React.render(instance, container);
-    expect(console.error.calls.length).toBe(0);
-
-    React.unmountComponentAtNode(container);
+    ReactTestUtils.renderIntoDocument(<Component />);
 
     expect(console.error.calls.length).toBe(1);
     expect(console.error.argsForCall[0][0]).toBe(
-      'Warning: componentDidUnmount was defined on Component. But there is no such ' +
-      'lifecycle method. Use componentWillUnmount instead.'
+      'Warning: Component has a method called ' +
+      'componentDidUnmount(). But there is no such lifecycle method. ' +
+      'Did you mean componentWillUnmount()?'
     );
   });