java - 为什么 Maven 失败并出现 SurefireExecutionException : > Cannot set option parallel with value

Question

您好，我正在使用 Windows XP 和最新版本完成本教程

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

谁能告诉我标签是什么。

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

当我使用这些标签进行构建时，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 (TestNG only) When you use the parallel attribute, TestNG will try to run all your test methods in separate threads, except for methods that depend on each other, which will be run in the same thread in order to respect their order of execution.

threadCount (TestNG only) The attribute thread-count allows you to specify how many threads should be allocated for this execution. Only makes sense to use in conjunction with parallel.

在 TestNG page 上有一个关于并行运行测试的部分插件文档。为此，您的 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>