Plugin use in test scope

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Given following plugin configuration:

<plugin>
    <groupId>ru.lanwen.raml</groupId>
    <artifactId>rarc-maven-plugin</artifactId>
    <version>1.2</version>
    <executions>
        <execution>
            <id>yard-api</id>
            <phase>generate-test-sources</phase>
            <goals>
                <goal>generate-client</goal>
            </goals>
            <configuration>
                <ramlFile>${project.basedir}/spec/server-api.raml</ramlFile>
                <basePackage>com.example.server.api</basePackage>
                <outputDir>${project.basedir}/target/generated-test-sources</outputDir>
            </configuration>
        </execution>
    </executions>
</plugin>

REST-client is generated fine. But maven does not even compile REST-client classes and fails with errors like:

[ERROR] /Users/darkfelex/projects/my-lovely-project/src/test/java/com/example/server/integration/Test1.java:[14,45] package com.example.server.api.projectname does not exist
[ERROR] /Users/darkfelex/projects/my-lovely-project/src/test/java/com/example/server/integration/Test1.java:[15,68] package com.example.server.api.projectname.releasetag.iterationid does not exist
[ERROR] /Users/darkfelex/projects/my-lovely-project/src/test/java/com/example/server/integration/Test1.java:[43,31] cannot find symbol
[ERROR] symbol:   class ApiReleaseIteration
[ERROR] location: class com.example.server.integration.Test1
[ERROR] /Users/darkfelex/projects/my-lovely-project/src/test/java/com/example/server/integration/Test1.java:[44,31] cannot find symbol