Go - keep it to yourself - Encapsulation and Embedding - Outer type's methods

Head First Go
楽天ブックス 紀伊國屋書店

開発環境

• macOS Mojave - Apple (OS)
• Emacs (Text Editor)
• Windows 10 Pro (OS)
• Visual Studio Code (Text Editor)
• Go (プログラミング言語)

Head First Go (Jay McGavren(著)、O'Reilly Media)のChapter 10(keep it to yourself - Encapsulation and Embedding)、Exercise(314)の解答を求めてみる。

コード

~/go/src/headfirstgo/geo/lanrdmark.go

package geo

import "errors"

type Landmark struct {
 name string
 Coordinates
}

func (l *Landmark) Name() string {
 return l.name
}
func (l *Landmark) SetName(name string) error {
 if name == "" {
  return errors.New("invalid name")
 }
 l.name = name
 return nil
}

コード

sample2_test.go

package main

import (
 "headfirstgo/geo"
 "log"
 "testing"
)

func TestLandmark(t *testing.T) {
 location := geo.Landmark{}
 err := location.SetName("The Googleplex")
 if err != nil {
  log.Fatal(err)
 }
 err = location.SetLatitude(37.42)
 if err != nil {
  log.Fatal(err)
 }
 err = location.SetLongitude(-122.08)
 if err != nil {
  log.Fatal(err)
 }
 want1 := "The Googleplex"
 got1 := location.Name()
 if got1 != want1 {
  t.Errorf("got %v, want %v", got1, want1)
 }
 want2 := 37.42
 got2 := location.Latitude()
 if got2 != want2 {
  t.Errorf("got %v, want %v", got2, want2)
 }
 want3 := -122.08
 got3 := location.Longitude()
 if got3 != want3 {
  t.Errorf("got %v, want %v", got3, want3)
 }
}

sample2.go

package main

func main() {}

入出力結果(Bash、cmd.exe(コマンドプロンプト)、Terminal)

$ go test
PASS
ok   _/.../go/Head_First_Go/ch10/sample2 0.006s
$