背景:我的目标是编写一个运行自包含的 TestNG-Selenium 系统(没有 Maven 或 Ant 插件的字符串;只有 Java)。它必须允许测试用例接受包括浏览器和域 URL 在内的参数。当TestRunner
实例化这些测试用例时,浏览器和域用于获取 Selenium 对象以执行其测试。
@BeforeSuite
问题:在尝试获取 Selenium 对象(在 a 中)之前,每个套件只有一个测试类成功获取域参数(在方法中@BeforeTest
)。没有接收域的测试类有一个null
selenium 对象 b/c 它不能被实例化。
代码:每个 XmlClass 都包含在它们自己的 XmlTest 中,并且所有三个都包含在一个 XmlSuite 中。该套件包含的顺序为 TestClass1、TestClass2,然后是 TestClass3。测试类本身是 2 层抽象基类的子类,其中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 运行正确。TestCase1 和 TestCase2 失败。生成堆栈跟踪...
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)
感谢您提供有关此问题的任何信息。