为什么Maven失败并出现SurefireExecutionException:>无法设置与值并行的选项

Question

嗨,我正在使用Windows XP和最新版本在这里完成教程

http://binil.wordpress.com/2006/12/08/automated-smoke-tests-with-selenium-cargo-testng-and-maven/

有人可以告诉我标签是什么.

<parallel>true</parallel>
<threadCount>10</threadCount>

当我使用这些标签构建时,我遇到了失败:

-------------------------------------------------------  
T E S T S
------------------------------------------------------- 
Running TestSuite
org.apache.maven.surefire.booter.SurefireExecutionException:
Cannot set option parallel with value
true; nested exception is
java.lang.reflect.InvocationTargetException:
null; nested exception is
org.apache.maven.surefire.util.NestedRuntimeException:
Cannot set option parallel with value
true; nested exception is
java.lang.reflect.InvocationTargetException:
null
org.apache.maven.surefire.util.NestedRuntimeException:
Cannot set option parallel with value
true; nested exception is
java.lang.reflect.InvocationTargetException:
null
java.lang.reflect.InvocationTargetException
 at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native
Method)  at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at
java.lang.reflect.Method.invoke(Method.java:585)
 at
org.apache.maven.surefire.testng.conf.AbstractDirectConfigurator$Setter.invoke(AbstractDirectConfigurator.java:117)
 at
org.apache.maven.surefire.testng.conf.AbstractDirectConfigurator.configure(AbstractDirectConfigurator.java:63)
 at
org.apache.maven.surefire.testng.TestNGExecutor.run(TestNGExecutor.java:71)
 at
org.apache.maven.surefire.testng.TestNGXmlTestSuite.execute(TestNGXmlTestSuite.java:92)
 at
org.apache.maven.surefire.Surefire.run(Surefire.java:177)
 at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native
Method)  at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at
java.lang.reflect.Method.invoke(Method.java:585)
 at
org.apache.maven.surefire.booter.SurefireBooter.runSuitesInProcess(SurefireBooter.java:338)
 at
org.apache.maven.surefire.booter.SurefireBooter.main(SurefireBooter.java:997)
Caused by:
java.lang.NullPointerException  at
org.testng.TestNG.setParallel(TestNG.java:347)
 ... 15 more [INFO]
------------------------------------------------------------------------ 
[ERROR] BUILD FAILURE [INFO]
------------------------------------------------------------------------

Answer 1

来自surefire-plugin文档:

parallel(仅限TestNG)当您使用parallel属性时,TestNG将尝试在不同的线程中运行所有测试方法,除了相互依赖的方法,这些方法将在同一个线程中运行,以便遵守它们的执行顺序.

threadCount(仅限TestNG)属性thread-count允许您指定应为此执行分配的线程数.只有与并行使用才有意义.

在插件文档的TestNG页面上有一个关于并行运行测试的部分.要做到这一点,你的surefire插件应该像这样配置:

<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-surefire-plugin</artifactId>
  <version>2.4.2</version>
  <configuration>
    <parallel>methods</parallel>
    <threadCount>10</threadCount>
  </configuration>
</plugin>