config rules to exclude some unnecessary code for unit code coverage?

[??????]

Hi,   for example, the code shown in the following pic, method of 
getDataSources return "backendDataSource.getDataSourceParameters()" directly. 

the full url is : 
https://coveralls.io/builds/25937232/source?filename=sharding-proxy/sharding-proxy-backend/src/main/java/org/apache/shardingsphere/shardingproxy/backend/schema/LogicSchema.java




it seems that there is little necessary for some code. 


So I'd like to know, is there some standard for unit code coverage rate? if so, 
has this coverage rate been configured into some file?




Tks.