<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> не помог.
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>3.0.0-M5</version>
<configuration>
<argLine>-Dfile.encoding=UTF-8</argLine>
</configuration>
</plugin>