creating_images_in_go_5.go

func (s *Scene) Save(filename string) {
	f, err := os.Create(filename)

	if err != nil {
		panic(err)
	}
	defer f.Close()
	png.Encode(f, s.Img)
}

func TestSceneSavePanicsWhenFileCannotBePersisted(t *testing.T) {
	scene := NewScene(4, 4)
	c := randomColor()
	scene.EachPixel(func(x, y int) color.RGBA { return c })
	assert.Panics(t, func() {
		scene.Save("/etc/temp.png")
	}, "panics when the file cannot be persisted")
}