Maven：从执行元素获取目标配置

Question

让我们想象一下我跟随mojo：

@Mojo(name = "some-goal")
public class MyMojo {
    @Parameter(required = true)
    protected ComplexObject param;
    /*...*/
}

另外我在pom中有插件的描述符：

<plugin>
  <!-- here artifact description -->
  <executions>
     <execution>
       <phase>...</phase>
       <goals><goal>some-goal</goal></goals>
       <configuration>
         <param>...</param>
       </configuration>
     </execution>
  </executions>
</plugin>

为了测试这个插件我使用maven-plugin-testing-harness

我的测试代码是：

@Test
public void test() throws Exception {
    File pom = getFile("mix/pom.xml");

    MyMojo plugin = (MyMojo) rule.lookupMojo("some-goal", pom);
    /*....*/

}

规则是：

@Rule
public MojoRule rule = new MojoRule() {
    @Override
    protected void before() throws Throwable {
    }

    @Override
    protected void after() {
    }
};

但是当我运行测试时，它会因异常而失败：

org.apache.maven.plugin.testing.ConfigurationException：无法找到artifactId为{plugin-name}的插件的配置元素。

at org.apache.maven.plugin.testing.AbstractMojoTestCase.extractPluginConfiguration(AbstractMojoTestCase.java:619)
at org.apache.maven.plugin.testing.AbstractMojoTestCase.extractPluginConfiguration(AbstractMojoTestCase.java:582)
at org.apache.maven.plugin.testing.AbstractMojoTestCase.lookupMojo(AbstractMojoTestCase.java:353)
at org.apache.maven.plugin.testing.MojoRule.lookupMojo(MojoRule.java:164)

当我调试maven-plugin-testing-harness的源代码时，我注意到它只从root插件元素读取配置。

如何强制它从执行元素读取配置？

Answer 1

添加空的<configuration></configuration>块来测试插件配置对我有帮助。

尝试使用这些deps：

<dependency>
    <groupId>org.apache.maven.plugin-testing</groupId>
    <artifactId>maven-plugin-testing-harness</artifactId>
    <version>3.3.0</version>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.codehaus.plexus</groupId>
    <artifactId>plexus-component-annotations</artifactId>
    <version>1.7.1</version>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.apache.maven</groupId>
    <artifactId>maven-compat</artifactId>
    <version>3.3.9</version>
</dependency>

Maven插件测试没有很好的描述，看起来有点儿...

Answer 2

有两种方法可以解决此问题。

将调用lookupMojo("some-goal", pom)更改为lookupEmptyMojo("some-goal", pom)

或者在build -> plugins -> plugin里面添加一个空的<configuration></configuration>部分。

<plugin>
  <!-- here artifact description -->
  <configuration></configuration>
  <executions>
     <execution>
       <phase>...</phase>
       <goals><goal>some-goal</goal></goals>
       <configuration>
         <param>...</param>
       </configuration>
     </execution>
  </executions>
</plugin>