Golang testing> package load

I am having a problem with inline testing for go lang.

I keep getting this error.

> go test
> can't load package: package .: found packages main (calculator.go) and calculator (calculator_test.go) in  

      

        
        
        
      

    

calculator.go

package main

func main() {

}

      

        
        
        
      

    

calculator_test.go

package calculator

import "testing"

func TestAdd(t *testing.T) {
    result := Add(1, 3)
    if result != 4 {
        t.Fail()
    }
}