@Singleton
public class Test {

public String xxx;
public String xyz;
}

Gives something like this on the class for every public field:
Description Resource Path Location Type
Managed bean with a public field must be @Dependent scoped [JSR-299 §3.1] MockOptionTestPlugin.java /forge-shell/src/test/java/org/jboss/seam/forge/shell/test/command line 36 CDI Problem

That error should be on the field, not the class.