api_cloneable_test.go

package routine

import (
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestCloneable(t *testing.T) {
	//struct can not be cast to interface
	var value any = personCloneable{Id: 1, Name: "Hello"}
	_, ok := value.(Cloneable)
	assert.False(t, ok)
	//pointer can be cast to interface
	var pointer any = &personCloneable{Id: 1, Name: "Hello"}
	_, ok2 := pointer.(Cloneable)
	assert.True(t, ok2)
	//nil pointer can be cast to interface
	pointer = (*personCloneable)(nil)
	cloneable, ok3 := pointer.(Cloneable)
	assert.True(t, ok3)
	assert.True(t, cloneable != nil)
}

func TestCloneable_Clone(t *testing.T) {
	//clone struct
	pc := &personCloneable{Id: 1, Name: "Hello"}
	assert.NotSame(t, pc, pc.Clone())
	assert.Equal(t, *pc, *(pc.Clone().(*personCloneable)))
	//copy pointer
	pcs := make([]*personCloneable, 1)
	pcs[0] = pc
	pcs2 := make([]*personCloneable, 1)
	copy(pcs2, pcs)
	assert.Same(t, pc, pcs2[0])
	//clone nil panic
	assert.Panics(t, func() {
		pc2 := (*personCloneable)(nil)
		_ = pc2.Clone()
	})
}

type personCloneable struct {
	Id   int
	Name string
}

func (p *personCloneable) Clone() any {
	return &personCloneable{Id: p.Id, Name: p.Name}
}