gistfile1.go

// x.go

package di

var someCall = func() string {
  return "original implementation"
}

func SomeMethodToTest() string {
  return someCall()
}




// x_test.go
package di

import (
	"testing"
)

func TestSomeCall(t *testing.T) {
	someCall = func() string {
		return "mock"
	}
	if SomeMethodToTest() != "mock" {
		t.Fail()
	}
}

Wouldn't this be a problem, if another test in the same package happens to override someCall method?

Redefining someCall method is not scope protected if it's in the same package?

I wonder how would you test dependencies from other packages - for example you have a web handler which calls a data layer methods... How do you manage dependency injection in such cases?