Test deleteMessage

Test	Status	Start time	Time (seconds)	Message
deleteMessage	1PASS	20 Dec 17:06:48	0.0

Target Class	Coverage contributed by deleteMessage
org.xwiki.component.internal.RoleHint   org.xwiki.component.internal.RoleHint	0.729729773%
org.xwiki.mail.internal.FileSystemMailContentStore   org.xwiki.mail.internal.FileSystemMailContentStore	0.405405440.5%
org.xwiki.component.embed.EmbeddableComponentManager   org.xwiki.component.embed.EmbeddableComponentManager	0.069306936.9%
org.xwiki.component.descriptor.DefaultComponentDescriptor   org.xwiki.component.descriptor.DefaultComponentDescriptor	0.0392156883.9%