Detect port

README.md

@@ -67,6 +67,21 @@ Type: `Object`
 
 Default: `{}`
 
+### port
+This service will automatically launch the standalone server on the port specified in your WebDriverIO configuration file. 
+
+For example:
+```js
+port: 4441,
+seleniumArgs: {
+  javaArgs: [
+    "-Xmx1024m"
+  ]
+}
+```
+This is useful for specifying custom ports on the command line when running tests, allowing multiple instances of the standalone server to run concurrently.
+
+
 ----
 
 For more information on WebdriverIO see the [homepage](http://webdriver.io).

lib/launcher.js

@@ -13,10 +13,7 @@ class SeleniumStandaloneLauncher {
     }
 
     onPrepare (config) {
-        this.seleniumArgs = config.seleniumArgs || {}
-        this.seleniumInstallArgs = config.seleniumInstallArgs || {}
-        this.seleniumLogs = config.seleniumLogs
-        this.logToStdout = config.logToStdout
+        this._getConfig(config)
 
         return this._installSeleniumDependencies(this.seleniumInstallArgs).then(() => new Promise((resolve, reject) => Selenium.start(this.seleniumArgs, (err, process) => {
             if (err) {
@@ -38,6 +35,22 @@ class SeleniumStandaloneLauncher {
         }
     }
 
+    _getConfig (config) {
+        this.seleniumArgs = config.seleniumArgs || {}
+        this.seleniumInstallArgs = config.seleniumInstallArgs || {}
+        this.seleniumLogs = config.seleniumLogs
+        this.logToStdout = config.logToStdout
+
+        if (config.port) {
+            if (this.seleniumArgs.seleniumArgs === undefined) {
+                this.seleniumArgs.seleniumArgs = []
+            }
+            if (this.seleniumArgs.seleniumArgs.indexOf('-port') < 0) {
+                this.seleniumArgs.seleniumArgs.push('-port', config.port)
+            }
+        }
+    }
+
     _installSeleniumDependencies (seleniumInstallArgs) {
         return new Promise((resolve, reject) => Selenium.install(seleniumInstallArgs, (err) => {
             if (err) {

test/unit/launcher/launcher.spec.js

@@ -0,0 +1,35 @@
+import launcher from '../../../lib/launcher'
+import path from 'path'
+import assert from 'assert'
+
+describe('getFilePath', function () {
+	it('should add custom port to seleniumArgs', function() {
+		const config = {
+			port: 4441,
+			seleniumArgs: {}, 
+			seleniumLogs: './logs',
+			services: ['selenium-standalone']
+		}
+		const launch = new launcher()
+		launch._getConfig(config)
+
+		const portIndex = launch.seleniumArgs.seleniumArgs.indexOf('-port')
+		assert.ok(portIndex >= 0 && launch.seleniumArgs.seleniumArgs[portIndex + 1] === 4441)
+	})
+
+	it('should not override custom port already in seleniumArgs', function() {
+		const config = {
+			port: 4441,
+			seleniumArgs: {
+				seleniumArgs: ['-port', 4444]
+			}, 
+			seleniumLogs: './logs',
+			services: ['selenium-standalone']
+		}
+		const launch = new launcher()
+		launch._getConfig(config)
+
+		const portIndex = launch.seleniumArgs.seleniumArgs.indexOf('-port')
+		assert.ok(portIndex >= 0 && launch.seleniumArgs.seleniumArgs[portIndex + 1] === 4444)
+	})
+})