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使用maven-plugin-testing-harness测试Maven插件

本文介绍了使用maven-plugin-testing-harness测试Maven插件的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我想开发一个Maven插件并正确地测试。我正在阅读有关并尝试了几个小时。我经常遇到 NoClassDefFoundError 和 NoSuchMethodError ，我无法弄清楚我需要哪些依赖项。

I want to develop a Maven plugin and also test it properly. I was reading the documentation on maven-plugin-testing-harness and trying things out for a few hours already. I'm constantly running into NoClassDefFoundError and NoSuchMethodError, I just can't figure out which dependencies I need.

这是我的MCVE：

现在我得到了：

java.lang.NoClassDefFoundError: org/apache/maven/plugin/descriptor/PluginDescriptorBuilder
    at org.apache.maven.plugin.testing.AbstractMojoTestCase.setUp(AbstractMojoTestCase.java:161)
    at junit.framework.TestCase.runBare(TestCase.java:139)
    at junit.framework.TestResult$1.protect(TestResult.java:122)
    at junit.framework.TestResult.runProtected(TestResult.java:142)
    at junit.framework.TestResult.run(TestResult.java:125)
    at junit.framework.TestCase.run(TestCase.java:129)
    at junit.framework.TestSuite.runTest(TestSuite.java:255)
    at junit.framework.TestSuite.run(TestSuite.java:250)
    at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:84)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: java.lang.ClassNotFoundException: org.apache.maven.plugin.descriptor.PluginDescriptorBuilder
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 15 more

这是我的插件的 pom.xml ： 

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>org.hisrc.storyteller</groupId>
    <artifactId>storyteller-maven-plugin</artifactId>
    <packaging>maven-plugin</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>storyteller-maven-plugin Maven Mojo</name>
    <dependencies>
        <dependency>
            <groupId>org.apache.maven</groupId>
            <artifactId>maven-plugin-api</artifactId>
            <version>2.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.maven</groupId>
            <artifactId>maven-core</artifactId>
            <version>3.3.9</version>
        </dependency>
        <dependency>
            <groupId>org.apache.maven</groupId>
            <artifactId>maven-artifact</artifactId>
            <version>3.3.9</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.maven</groupId>
            <artifactId>maven-compat</artifactId>
            <version>3.3.9</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.maven.plugin-testing</groupId>
            <artifactId>maven-plugin-testing-harness</artifactId>
            <scope>test</scope>
            <version>3.3.0</version>
        </dependency>
    </dependencies>
</project>

MyMojo.java 很简单：

/**
 * Goal which touches a timestamp file.
 *
 * @goal touch
 *
 * @phase process-sources
 */
public class MyMojo extends AbstractMojo {
    /**
     * Location of the file.
     *
     * @parameter expression="${project.build.directory}"
     * @required
     */
    private File outputDirectory;

    public void execute() throws MojoExecutionException {
        // Simply creates a touch.txt file in outputDirectory
    }
}

测试：

public class MyMojoTest extends AbstractMojoTestCase {

    @Test
    public void testSomething()
        throws Exception
    {
        File pom = getTestFile( "src/test/resources/org/hisrc/storyteller/pom.xml" );
        assertNotNull( pom );
        assertTrue( pom.exists() );

        MyMojo myMojo = (MyMojo) lookupMojo( "touch", pom );
        assertNotNull( myMojo );
        myMojo.execute();
    }
}

pom.xml 用于测试：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.hisrc.storyteller</groupId>
    <artifactId>project-to-test</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>
    <name>Test MyMojo</name>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <artifactId>storyteller-maven-plugin</artifactId>
                <configuration>
                    <outputDirectory>target/test-harness/project-to-test</outputDirectory>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

如果我更改 maven-plugin-api 到 3.0 ，我得到：

If I change the version of the maven-plugin-api to 3.0, I'm getting:

java.lang.NoSuchMethodError: org.codehaus.plexus.ContainerConfiguration.setClassPathScanning(Ljava/lang/String;)Lorg/codehaus/plexus/ContainerConfiguration;
    at org.apache.maven.plugin.testing.AbstractMojoTestCase.setupContainerConfiguration(AbstractMojoTestCase.java:285)
    at org.apache.maven.plugin.testing.AbstractMojoTestCase.setupContainer(AbstractMojoTestCase.java:259)
    at org.apache.maven.plugin.testing.AbstractMojoTestCase.getContainer(AbstractMojoTestCase.java:298)
    at org.apache.maven.plugin.testing.AbstractMojoTestCase.setUp(AbstractMojoTestCase.java:152)
    at junit.framework.TestCase.runBare(TestCase.java:139)
    at junit.framework.TestResult$1.protect(TestResult.java:122)
    at junit.framework.TestResult.runProtected(TestResult.java:142)
    at junit.framework.TestResult.run(TestResult.java:125)
    at junit.framework.TestCase.run(TestCase.java:129)
    at junit.framework.TestSuite.runTest(TestSuite.java:255)
    at junit.framework.TestSuite.run(TestSuite.java:250)
    at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:84)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

我环顾四周，我看到的只是人们看起来添加一些随机依赖，有时事情有时不起作用。我花了几个小时尝试做同样的事情，但没有设法让它工作。我现在非常绝望，并希望有人最终弄清楚它并指出我正确的依赖关系和/或版本。

I've looked around and all I see is that people seem to add some random dependencies, sometimes things work sometimes not. I've spent a few hours trying to do the same but did not manage to make it work. I'm quite desperate at the moment and hope that someone eventually figured it out and could point me to the correct dependencies and/or versions.

推荐答案

@FlorianAlbrecht是对的，我必须为Maven依赖项指定相同的版本（ 3.3.9 ）。这就是我最终得到的结果：

@FlorianAlbrecht was right, I had to specify the same version (3.3.9) for Maven dependencies. This is what I ended up with:

<properties>
    <maven.version>3.3.9</maven.version>
</properties>
<dependencies>
    <dependency>
        <groupId>org.apache.maven.plugin-tools</groupId>
        <artifactId>maven-plugin-annotations</artifactId>
        <version>3.5</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.apache.maven</groupId>
        <artifactId>maven-plugin-api</artifactId>
        <version>${maven.version}</version>
    </dependency>
    <dependency>
        <groupId>org.apache.maven</groupId>
        <artifactId>maven-core</artifactId>
        <version>${maven.version}</version>
    </dependency>
    <dependency>
        <groupId>org.apache.maven</groupId>
        <artifactId>maven-artifact</artifactId>
        <version>${maven.version}</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.apache.maven</groupId>
        <artifactId>maven-compat</artifactId>
        <version>${maven.version}</version>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.11</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.apache.maven.plugin-testing</groupId>
        <artifactId>maven-plugin-testing-harness</artifactId>
        <scope>test</scope>
        <version>3.3.0</version>
    </dependency>
</dependencies>

这篇关于使用maven-plugin-testing-harness测试Maven插件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！

08-15 18:47
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