Maven plugin does not support generating test sources

[derkork]

When using the maven plugin, the generated sources are only added to the normal compile path. If you want to generate test sources though, then these will not be added to the test compile path. The mojo would need to call addTestCompileSourceRoot instead of addCompileSourceRoot in this case. A workaround is to manually add the source root like this:

            <plugin>
                <groupId>com.ancientlightstudios</groupId>
                <artifactId>simplegen-maven-plugin</artifactId>
                <version>3.0.0</version>
                <executions>
                    <execution>
                        <id>generate-test-client</id>
                        <phase>generate-test-sources</phase>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                        <configuration>
                            <configFileName>config-test.yml</configFileName>
                            <outputDirectory>${project.build.directory}/generated-test-sources/simplegen</outputDirectory>
                        </configuration>
                    </execution>
                </executions>
            </plugin>

            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>build-helper-maven-plugin</artifactId>
                <version>1.9.1</version>
                <executions>
                    <execution>
                        <id>add-test-source</id>
                        <phase>generate-test-sources</phase>
                        <goals>
                            <goal>add-test-source</goal>
                        </goals>
                        <configuration>
                            <sources>
                                <source>${project.build.directory}/generated-test-sources/simplegen</source>
                            </sources>
                        </configuration>
                    </execution>
                </executions>
            </plugin>