TestNG是否保证在@BeforeTest方法之前执行@BeforeSuite方法？

Question

背景:我的目标是编写一个运行自包含的TestNG-Selenium系统(没有字符串到maven或ant插件;只是java).它必须允许测试用例接受包括浏览器和域URL的参数.当TestRunner实例化这些测试用例时,浏览器和域用于获取Selenium对象来执行它的测试.

问题:在尝试获取Selenium对象(在@BeforeTest中)之前,每个套件只有一个测试类成功获取域参数(在@BeforeSuite方法中).没有接收域的测试类具有空的selenium对象b/c它不能被实例化.

代码:XmlClasses每个都包含在他们自己的XmlTest中,并且所有三个都在一个XmlSuite中.该套件包含TestClass1,TestClass2和TestClass3的顺序.测试类本身是2层抽象基类的子类,包括初始化注入变量并随后获取Selenium实例的功能.这样做的目的是使用尽可能少的重复代码测试一个或多个应用程序(在多个域上)(即:Selenium实例化在根基类中,因为它对所有测试都是通用的).有关详细信息,请参阅以下方法

// Top-most custom base class
abstract public class WebAppTestBase extends SeleneseTestBase
{
        private static Logger logger = Logger.getLogger(WebAppTestBase.class);
        protected static Selenium selenium = null;
        protected String domain = null;
        protected String browser = null;

        @BeforeTest(alwaysRun = true)
        @Parameters({ "selenium.browser" })
        public void setupTest(String browser)
        {
                this.browser = browser;
                logger.debug(this.getClass().getName()
                                + " acquiring Selenium instance ('" + this.browser + " : " + domain + "').");
                selenium = new DefaultSelenium("localhost", 4444, browser, domain);
                selenium.start();
        }

}

// Second level base class.
public abstract class App1TestBase extends WebAppTestBase
{

        @BeforeSuite(alwaysRun = true)
        @Parameters({"app1.domain" })
        public void setupSelenium(String domain)
        {
                // This should execute for each test case prior to instantiating any Selenium objects in @BeforeTest
                logger.debug(this.getClass().getName() + " starting selenium on domain '" + domain+ "'.");
                this.domain = domain;
        }
}

// Leaf level test class
public class TestClass1 extends App1TestBase
{
        @Test
        public void validateFunctionality() throws Exception
        {
                // Code for tests go here...
        }
}

// Leaf level test class
public class TestClass2 extends App1TestBase
{
        @Test
        public void validateFunctionality() throws Exception
        {
                selenium.isElementPresent( ...
                // Rest of code for tests go here...
                // ....
        }
}


// Leaf level test class
public class TestClass3 extends App1TestBase
{
        @Test
        public void validateFunctionality() throws Exception
        {
                // Code for tests go here...
        }
}

输出:TestCase3正确运行.TestCase1和TestCase2失败.堆栈跟踪生成...

 10:08:23 [DEBUG RunTestCommand.java:63] - Running Tests.
 10:08:23 [Parser] Running:
  Command line suite
  Command line suite

[DEBUG App1TestBase.java:49] - TestClass3 starting selenium on domain 'http://localhost:8080'.
 10:08:24 [DEBUG WebAppTestBase.java:46] - TestClass2 acquiring Selenium instance ('*firefox : null').
 10:08:24 [ERROR SeleniumCoreCommand.java:40] - Exception running 'isElementPresent 'command on session null
 10:08:24 java.lang.NullPointerException: sessionId should not be null; has this session been started yet?
        at org.openqa.selenium.server.FrameGroupCommandQueueSet.getQueueSet(FrameGroupCommandQueueSet.java:216)
        at org.openqa.selenium.server.commands.SeleniumCoreCommand.execute(SeleniumCoreCommand.java:34)
        at org.openqa.selenium.server.SeleniumDriverResourceHandler.doCommand(SeleniumDriverResourceHandler.java:562)
        at org.openqa.selenium.server.SeleniumDriverResourceHandler.handleCommandRequest(SeleniumDriverResourceHandler.java:370)
        at org.openqa.selenium.server.SeleniumDriverResourceHandler.handle(SeleniumDriverResourceHandler.java:129)
        at org.openqa.jetty.http.HttpContext.handle(HttpContext.java:1530)
        at org.openqa.jetty.http.HttpContext.handle(HttpContext.java:1482)
        at org.openqa.jetty.http.HttpServer.service(HttpServer.java:909)
        at org.openqa.jetty.http.HttpConnection.service(HttpConnection.java:820)
        at org.openqa.jetty.http.HttpConnection.handleNext(HttpConnection.java:986)
        at org.openqa.jetty.http.HttpConnection.handle(HttpConnection.java:837)
        at org.openqa.jetty.http.SocketListener.handleConnection(SocketListener.java:245)
        at org.openqa.jetty.util.ThreadedServer.handle(ThreadedServer.java:357)
        at org.openqa.jetty.util.ThreadPool$PoolThread.run(ThreadPool.java:534)

我感谢您就此问题提供的任何信息.

Answer 1

我认为问题是你的@BeforeSuite方法正在为一个字段赋值,但你有三个不同的实例,所以其他两个实例永远不会被初始化.

请记住@BeforeSuite只运行一次,无论它属于哪个类.因此,@ Before/AfterSuite方法通常在整个测试环境之外的类上定义.这些方法应该是静态的,但我决定不执行这个要求,因为它有时是不切实际的.

我认为解决问题的更好方法是将您的域字段视为注入资源,您的每个测试都将从Guice或其他依赖注入框架中获取.