godebug

2017-02-16-042524.go

package main

import (
	"testing"

	"github.com/kylelemons/godebug/pretty"
)

type ShipManifest struct {
	Name string
	Crew map[string]string
	// ...
}

func TestIntroduceGoDebugPretty(t *testing.T) {
	// AddCrew tries to add the given crewmember to the manifest.
	AddCrew := func(m *ShipManifest, name, title string) {
		// ...
		if m.Crew == nil {
			m.Crew = make(map[string]string)
		}
		m.Crew[title] = name
	}
	tests := []struct {
		desc        string
		before      *ShipManifest
		name, title string
		after       *ShipManifest
	}{
		{
			desc:   "add first",
			before: &ShipManifest{},
			name:   "Zaphod Beeblebrox",
			title:  "Galactic President",
			after: &ShipManifest{
				Crew: map[string]string{
					"Zaphod Beeblebrox": "Galactic President",
				},
			},
		},
		// ...
	}

	for _, tt := range tests {
		AddCrew(tt.before, tt.name, tt.title)
		if diff := pretty.Compare(tt.before, tt.after); diff != "" {
			t.Errorf("%s: post-AddCrew diff: (-got +want)\n%s", tt.desc, diff)
		}
	}
}