配置： Maven 3、Objectify、Google-Appengine、Java 7
我想找到一种datastore-indexes-auto.xml仅使用单元测试自动生成索引（在文件中）的方法。但是，尽管测试调用数据存储查询，但不会生成文件。
在我的项目中，我使用标准的 Maven 布局：
src/
main/
test/
target/
使用 Maven 运行我的单元测试时，不会datastore-indexes-auto.xml生成任何文件（至少我在项目目录中的任何地方都找不到它）。当然，所有测试都通过了。
有没有办法只使用单元测试自动生成索引？
这是pom.xml文件（根据正确答案更新）：
<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>com.something.example</groupId>
<artifactId>example</artifactId>
<version>0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>Example</name>
<description>Example POM for my appengine project.</description>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<gae.version>1.8.1</gae.version>
<objectify.version>4.0rc1</objectify.version>
<java.version>1.7</java.version>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>${java.version}</source>
<target>${java.version}</target>
</configuration>
</plugin>
<plugin>
<groupId>com.google.appengine</groupId>
<artifactId>appengine-maven-plugin</artifactId>
<version>${gae.version}</version>
<configuration>
<oauth2>false</oauth2>
<address>0.0.0.0</address>
</configuration>
</plugin>
<!-- UPDATE: Based on @Amir's answer, I have added this plugin in order to
-- copy the generated index file to the webapp directory. -->
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>2.6</version>
<executions>
<execution>
<id>copy-resources</id>
<phase>test</phase>
<goals>
<goal>copy-resources</goal>
</goals>
<configuration>
<outputDirectory>${basedir}/target/${project.artifactId}-${project.version}/WEB-INF/appengine-generated</outputDirectory>
<resources>
<resource>
<directory>${basedir}/WEB-INF/appengine-generated</directory>
<filtering>false</filtering>
</resource>
</resources>
</configuration>
</execution>
</executions>
</plugin>
<!-- UPDATE: This will remove the genreated WEB-INF directory with the mvn clean
-- command. -->
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>2.5</version>
<configuration>
<filesets>
<fileset>
<directory>WEB-INF</directory>
</fileset>
</filesets>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
<type>jar</type>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>0.11.8</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.googlecode.objectify</groupId>
<artifactId>objectify</artifactId>
<version>${objectify.version}</version>
</dependency>
<!-- GAE -->
<dependency>
<groupId>com.google.appengine</groupId>
<artifactId>appengine-api-1.0-sdk</artifactId>
<version>${gae.version}</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.google.appengine</groupId>
<artifactId>appengine-api-labs</artifactId>
<version>${gae.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.google.appengine</groupId>
<artifactId>appengine-api-stubs</artifactId>
<version>${gae.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.google.appengine</groupId>
<artifactId>appengine-testing</artifactId>
<version>${gae.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>httpunit</groupId>
<artifactId>httpunit</artifactId>
<version>1.7</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.mozilla</groupId>
<artifactId>rhino</artifactId>
<version>1.7R4</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>joda-time</groupId>
<artifactId>joda-time</artifactId>
<version>2.2</version>
</dependency>
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-core</artifactId>
<version>1.9.5</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>