package rotate

import (
	"image"
	"image/png"
	"net/http"
	"os"
	"testing"
	"math"
)

func TestRender(t *testing.T) {
	gopherImg, err := func() (image.Image, error) {
		r, err := http.Get("https://go.dev/images/favicon-gopher.png")
		defer r.Body.Close()
		if err != nil {
			return nil, err
		}
		img, err := png.Decode(r.Body)
		if err != nil {
			return nil, err
		}
		return img, nil
	}()
	if err != nil {
		t.Fatal(err)
	}

	f, err := os.Create("img.png")
	if err != nil {
		t.Fatal(err)
	}
	defer f.Close()
	err = png.Encode(f, Rotate(gopherImg, math.Pi/6))
	if err != nil {
		t.Fatal(err)
	}
}