Fix build for useCreateElement: false, run Travis

It's important that we keep these code paths working because they're the only comprehensive test of adopting server-rendered HTML that we have right now. This is terrible and hacky but I am hopeful that it will at least catch stuff.

.travis.yml

@@ -73,6 +73,11 @@ script:
       else
         ./node_modules/.bin/grunt jest:normal
       fi
+      echo 'Testing in server-render (HTML generation) mode...'
+      printf '\nmodule.exports.useCreateElement = false;\n' \
+        >> src/renderers/dom/shared/ReactDOMFeatureFlags.js
+      ./node_modules/.bin/grunt jest:normal
+      git checkout -- src/renderers/dom/shared/ReactDOMFeatureFlags.js
     else
       ./node_modules/.bin/grunt $TEST_TYPE
     fi

src/renderers/dom/client/wrappers/__tests__/ReactDOMInput-test.js

@@ -18,6 +18,7 @@ describe('ReactDOMInput', function() {
   var EventConstants;
   var React;
   var ReactDOM;
+  var ReactDOMFeatureFlags;
   var ReactLink;
   var ReactTestUtils;
 
@@ -26,6 +27,7 @@ describe('ReactDOMInput', function() {
     EventConstants = require('EventConstants');
     React = require('React');
     ReactDOM = require('ReactDOM');
+    ReactDOMFeatureFlags = require('ReactDOMFeatureFlags');
     ReactLink = require('ReactLink');
     ReactTestUtils = require('ReactTestUtils');
     spyOn(console, 'error');
@@ -578,6 +580,9 @@ describe('ReactDOMInput', function() {
   });
 
   it('sets type before value always', function() {
+    if (!ReactDOMFeatureFlags.useCreateElement) {
+      return;
+    }
     var log = [];
     var originalCreateElement = document.createElement;
     spyOn(document, 'createElement').andCallFake(function(type) {

src/renderers/dom/shared/__tests__/ReactDOMComponent-test.js

@@ -17,12 +17,14 @@ describe('ReactDOMComponent', function() {
   var React;
 
   var ReactDOM;
+  var ReactDOMFeatureFlags;
   var ReactDOMServer;
 
   beforeEach(function() {
     jest.resetModuleRegistry();
     React = require('React');
     ReactDOM = require('ReactDOM');
+    ReactDOMFeatureFlags = require('ReactDOMFeatureFlags');
     ReactDOMServer = require('ReactDOMServer');
   });
 
@@ -294,7 +296,11 @@ describe('ReactDOMComponent', function() {
       var container = document.createElement('div');
       ReactDOM.render(<svg theWord="theBird" />, container);
 
-      expect(container.firstChild.hasAttribute('theWord')).toBe(true);
+      if (ReactDOMFeatureFlags.useCreateElement) {
+        // jsdom's svg parsing makes attributes lowercase, so only assert this
+        // in createElement mode...
+        expect(container.firstChild.hasAttribute('theWord')).toBe(true);
+      }
       ReactDOM.render(<svg />, container);
       expect(container.firstChild.hasAttribute('theWord')).toBe(false);
     });