[Extensions Bindings] Add a messaging test

chrome/test/data/extensions/api_test/native_bindings/background.js

Index: chrome/test/data/extensions/api_test/native_bindings/background.js
diff --git a/chrome/test/data/extensions/api_test/native_bindings/background.js b/chrome/test/data/extensions/api_test/native_bindings/background.js
index d0ccb14de99674d58b031783a06c12d5831f9ced..bf18b8d4eda2823e45f2d3ed2670eff704bedd02 100644
--- a/chrome/test/data/extensions/api_test/native_bindings/background.js
+++ b/chrome/test/data/extensions/api_test/native_bindings/background.js
@@ -5,6 +5,8 @@
 if (!chrome || !chrome.test)
   throw new Error('chrome.test is undefined');
 
+var portNumber;
+
 // This is a good end-to-end test for two reasons. The first is obvious - it
 // tests a simple API and makes sure it behaves as expected, as well as testing
 // that other APIs are unavailable.
@@ -14,7 +16,7 @@ if (!chrome || !chrome.test)
 // enters JS) and custom JS bindings (in order to have our runTests, assert*
 // methods, etc). If any of these stages failed, the test itself would also
 // fail.
-chrome.test.runTests([
+var tests = [
   function idleApi() {
     chrome.test.assertTrue(!!chrome.idle);
     chrome.test.assertTrue(!!chrome.idle.IdleState);
@@ -56,4 +58,39 @@ chrome.test.runTests([
       chrome.test.succeed();
     });
   },
-]);
+  function testMessaging() {
+    var tabId;
+    var createPort = function() {
+      chrome.test.assertTrue(!!tabId);
+      var port = chrome.tabs.connect(tabId);
+      chrome.test.assertTrue(!!port, 'Port does not exist');
+      port.onMessage.addListener(message => {
+        chrome.test.assertEq('content script', message);
+        port.disconnect();
+        chrome.test.succeed();
+      });
+      port.postMessage('background page');
+    };
+
+    chrome.runtime.onMessage.addListener((message, sender, sendResponse) => {
+      chrome.test.assertEq('startFlow', message);
+      createPort();
+      sendResponse('started');
+    });
+    var url = 'http://localhost:' + portNumber +
+              '/native_bindings/messaging_test.html';
+    chrome.tabs.create({url: url}, function(tab) {
+      chrome.test.assertNoLastError();
+      chrome.test.assertTrue(!!tab);
+      chrome.test.assertTrue(!!tab.id && tab.id >= 0);
+      tabId = tab.id;
+    });
+  },
+];
+
+chrome.test.getConfig(config => {
+  chrome.test.assertTrue(!!config, 'config does not exist');
+  chrome.test.assertTrue(!!config.testServer, 'testServer does not exist');
+  portNumber = config.testServer.port;
+  chrome.test.runTests(tests);
+});