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package kitty
import (
"bytes"
"compress/zlib"
"image"
"image/color"
"io"
"testing"
)
// taken from "image/png" package
const pngHeader = "\x89PNG\r\n\x1a\n"
// testImage creates a simple test image with a red and blue pattern
func testImage() *image.RGBA {
img := image.NewRGBA(image.Rect(0, 0, 2, 2))
img.Set(0, 0, color.RGBA{R: 255, G: 0, B: 0, A: 255}) // Red
img.Set(1, 0, color.RGBA{R: 0, G: 0, B: 255, A: 255}) // Blue
img.Set(0, 1, color.RGBA{R: 0, G: 0, B: 255, A: 255}) // Blue
img.Set(1, 1, color.RGBA{R: 255, G: 0, B: 0, A: 255}) // Red
return img
}
func TestEncoder_Encode(t *testing.T) {
tests := []struct {
name string
encoder Encoder
img image.Image
wantErr bool
verify func([]byte) error
}{
{
name: "nil image",
encoder: Encoder{
Format: RGBA,
},
img: nil,
wantErr: false,
verify: func(got []byte) error {
if len(got) != 0 {
t.Errorf("expected empty output for nil image, got %d bytes", len(got))
}
return nil
},
},
{
name: "RGBA format",
encoder: Encoder{
Format: RGBA,
},
img: testImage(),
wantErr: false,
verify: func(got []byte) error {
expected := []byte{
255, 0, 0, 255, // Red pixel
0, 0, 255, 255, // Blue pixel
0, 0, 255, 255, // Blue pixel
255, 0, 0, 255, // Red pixel
}
if !bytes.Equal(got, expected) {
t.Errorf("unexpected RGBA output\ngot: %v\nwant: %v", got, expected)
}
return nil
},
},
{
name: "RGB format",
encoder: Encoder{
Format: RGB,
},
img: testImage(),
wantErr: false,
verify: func(got []byte) error {
expected := []byte{
255, 0, 0, // Red pixel
0, 0, 255, // Blue pixel
0, 0, 255, // Blue pixel
255, 0, 0, // Red pixel
}
if !bytes.Equal(got, expected) {
t.Errorf("unexpected RGB output\ngot: %v\nwant: %v", got, expected)
}
return nil
},
},
{
name: "PNG format",
encoder: Encoder{
Format: PNG,
},
img: testImage(),
wantErr: false,
verify: func(got []byte) error {
// Verify PNG header
// if len(got) < 8 || !bytes.Equal(got[:8], []byte{137, 80, 78, 71, 13, 10, 26, 10}) {
if len(got) < 8 || !bytes.Equal(got[:8], []byte(pngHeader)) {
t.Error("invalid PNG header")
}
return nil
},
},
{
name: "invalid format",
encoder: Encoder{
Format: 999, // Invalid format
},
img: testImage(),
wantErr: true,
verify: nil,
},
{
name: "RGBA with compression",
encoder: Encoder{
Format: RGBA,
Compress: true,
},
img: testImage(),
wantErr: false,
verify: func(got []byte) error {
// Decompress the data
r, err := zlib.NewReader(bytes.NewReader(got))
if err != nil {
return err //nolint:wrapcheck
}
defer r.Close()
decompressed, err := io.ReadAll(r)
if err != nil {
return err //nolint:wrapcheck
}
expected := []byte{
255, 0, 0, 255, // Red pixel
0, 0, 255, 255, // Blue pixel
0, 0, 255, 255, // Blue pixel
255, 0, 0, 255, // Red pixel
}
if !bytes.Equal(decompressed, expected) {
t.Errorf("unexpected decompressed output\ngot: %v\nwant: %v", decompressed, expected)
}
return nil
},
},
{
name: "zero format defaults to RGBA",
encoder: Encoder{
Format: 0,
},
img: testImage(),
wantErr: false,
verify: func(got []byte) error {
expected := []byte{
255, 0, 0, 255, // Red pixel
0, 0, 255, 255, // Blue pixel
0, 0, 255, 255, // Blue pixel
255, 0, 0, 255, // Red pixel
}
if !bytes.Equal(got, expected) {
t.Errorf("unexpected RGBA output\ngot: %v\nwant: %v", got, expected)
}
return nil
},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
var buf bytes.Buffer
err := tt.encoder.Encode(&buf, tt.img)
if (err != nil) != tt.wantErr {
t.Errorf("Encode() error = %v, wantErr %v", err, tt.wantErr)
return
}
if !tt.wantErr && tt.verify != nil {
if err := tt.verify(buf.Bytes()); err != nil {
t.Errorf("verification failed: %v", err)
}
}
})
}
}
func TestEncoder_EncodeWithDifferentImageTypes(t *testing.T) {
// Create different image types for testing
rgba := image.NewRGBA(image.Rect(0, 0, 1, 1))
rgba.Set(0, 0, color.RGBA{R: 255, G: 0, B: 0, A: 255})
gray := image.NewGray(image.Rect(0, 0, 1, 1))
gray.Set(0, 0, color.Gray{Y: 128})
tests := []struct {
name string
img image.Image
format int
wantLen int
}{
{
name: "RGBA image to RGBA format",
img: rgba,
format: RGBA,
wantLen: 4, // 4 bytes per pixel
},
{
name: "Gray image to RGBA format",
img: gray,
format: RGBA,
wantLen: 4, // 4 bytes per pixel
},
{
name: "RGBA image to RGB format",
img: rgba,
format: RGB,
wantLen: 3, // 3 bytes per pixel
},
{
name: "Gray image to RGB format",
img: gray,
format: RGB,
wantLen: 3, // 3 bytes per pixel
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
var buf bytes.Buffer
enc := Encoder{Format: tt.format}
err := enc.Encode(&buf, tt.img)
if err != nil {
t.Errorf("Encode() error = %v", err)
return
}
if got := buf.Len(); got != tt.wantLen {
t.Errorf("Encode() output length = %v, want %v", got, tt.wantLen)
}
})
}
}
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