fix(runner): running with chromeOnly should try to find chromedriver with .exe extension

Closes #283

Author: juliemr

example/chromeOnlyConf.js

@@ -0,0 +1,21 @@
+// An example configuration file.
+exports.config = {
+  // Do not start a Selenium Standalone sever - only run this using chrome.
+  chromeOnly: true,
+  chromeDriver: './selenium/chromedriver',
+
+  // Capabilities to be passed to the webdriver instance.
+  capabilities: {
+    'browserName': 'chrome'
+  },
+
+  // Spec patterns are relative to the current working directly when
+  // protractor is called.
+  specs: ['example_spec.js'],
+
+  // Options to be passed to Jasmine-node.
+  jasmineNodeOpts: {
+    showColors: true,
+    defaultTimeoutInterval: 30000
+  }
+};

lib/runner.js

@@ -201,6 +201,13 @@ var runJasmineTests = function() {
   var runDeferred = webdriver.promise.defer();
 
   if (config.chromeOnly) {
+    if (!fs.existsSync(config.chromeDriver)) {
+      if (fs.existsSync(config.chromeDriver + '.exe')) {
+        config.chromeDriver += '.exe';
+      } else {
+        throw 'Could not find chromedriver at ' + config.chromeDriver;
+      }
+    }
     var service = new chrome.ServiceBuilder(config.chromeDriver).build();
     driver = chrome.createDriver(
         new webdriver.Capabilities(config.capabilities), service);