package imgcache

import (
	"bytes"
	"image"
	"image/color"
	"image/jpeg"
	"testing"
)

// Shared test data literals, extracted as constants for goconst.
const (
	testHostCDN     = "cdn.example.com"
	testHostExample = "example.com"
	testPathCat     = "/photos/cat.jpg"
)

// generateTestJPEG creates a minimal valid JPEG image.
func generateTestJPEG(t *testing.T, width, height int, c color.Color) []byte {
	t.Helper()

	img := image.NewRGBA(image.Rect(0, 0, width, height))
	for y := range height {
		for x := range width {
			img.Set(x, y, c)
		}
	}

	var buf bytes.Buffer

	err := jpeg.Encode(&buf, img, &jpeg.Options{Quality: 85})
	if err != nil {
		t.Fatalf("failed to encode test JPEG: %v", err)
	}

	return buf.Bytes()
}