How to test a package in go excluding some files?

I have folder structure somewhat like this.

├── executor
|   ├── executor_test.go
|   |── executor.go
|   |--excutor_mock.go
|   |--errors.go
|   |--app.go 
├── _includes
|   ├── xyz.go
|   └── abc.go
├──vendor

executor_test.go contains all the unit test cases for executor.go.

So when i run go test --cover ./... Its shows me the coverage package wise which is good but i also want to exclude errors.go , excutor_mock.go and app.go in executor folder from showing up in go test --cover ./....So is there a way to exclude them?