Golang - Testing with filesystem and reaching 100%

Question

I\'m trying to test one of my package to reach 100%. However, I can\'t find how I can do this without being \"against the system\" (functions pointers, etc.).

I trie

Answer 1

I attempted to do same thing, just to try it. I achieved it by referencing all system file calls as interfaces and having method accept an interface. Then if no interface was provided the system method was used. I am brand new to Go, so I'm not sure if it violates best practices or not.

import "io/ioutil"


type ReadFile func (string) ([]byte, error)


type FileLoader interface {
    LoadPath(path string) []byte
}

// Initializes a LocalFileSystemLoader with default ioutil.ReadFile
// as the method to read file.  Optionally allows caller to provide
// their own ReadFile for testing.
func NewLocalFileSystemLoader(rffn ReadFile) *localFileSystemLoader{
    var rf ReadFile = ioutil.ReadFile

    if rffn != nil {
        rf = rffn
    }
    return &localFileSystemLoader{
        ReadFileFn: rf}
}

type localFileSystemLoader struct {
    ReadFileFn ReadFile
}

func (lfsl *localFileSystemLoader) LoadPath(path string) []byte {
    dat, err := lfsl.ReadFileFn(path)
    if err != nil {
        panic(err)
    }

    return dat
}