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concat_test.go
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concat_test.go
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package imagecat
import (
"bytes"
_ "embed"
"image"
"image/draw"
"image/jpeg"
"testing"
)
//go:embed resources/img1.jpeg
var img1Bytes []byte
//go:embed resources/img2.jpeg
var img2Bytes []byte
//go:embed resources/img3.jpeg
var img3Bytes []byte
//go:embed resources/result.x.jpeg
var resultXBytes []byte
//go:embed resources/result.y.jpeg
var resultYBytes []byte
//go:embed resources/result.x.center.jpeg
var resultXCenterBytes []byte
//go:embed resources/result.y.center.jpeg
var resultYCenterBytes []byte
//go:embed resources/result.x.end.jpeg
var resultXEndBytes []byte
//go:embed resources/result.y.end.jpeg
var resultYEndBytes []byte
//go:embed resources/result.x.src.jpeg
var resultXSrcBytes []byte
func TestConcat(t *testing.T) {
img1, err := jpeg.Decode(bytes.NewReader(img1Bytes))
if err != nil {
t.Error(err)
}
img2, err := jpeg.Decode(bytes.NewReader(img2Bytes))
if err != nil {
t.Error(err)
}
img3, err := jpeg.Decode(bytes.NewReader(img3Bytes))
if err != nil {
t.Error(err)
}
type args struct {
images []image.Image
options []OptionFn
}
tests := []struct {
name string
args args
want []byte
wantErr bool
}{
{
name: "x-axis",
args: args{images: []image.Image{img1, img2, img3}},
want: resultXBytes,
wantErr: false,
},
{
name: "y-axis",
args: args{images: []image.Image{img1, img2, img3}, options: []OptionFn{WithAxis(AxisY)}},
want: resultYBytes,
wantErr: false,
},
{
name: "x-axis center",
args: args{images: []image.Image{img1, img2, img3}, options: []OptionFn{WithAlignment(AlignmentCenter)}},
want: resultXCenterBytes,
wantErr: false,
},
{
name: "y-axis center",
args: args{images: []image.Image{img1, img2, img3}, options: []OptionFn{WithAxis(AxisY), WithAlignment(AlignmentCenter)}},
want: resultYCenterBytes,
wantErr: false,
},
{
name: "x-axis end",
args: args{images: []image.Image{img1, img2, img3}, options: []OptionFn{WithAlignment(AlignmentEnd)}},
want: resultXEndBytes,
wantErr: false,
},
{
name: "y-axis end",
args: args{images: []image.Image{img1, img2, img3}, options: []OptionFn{WithAxis(AxisY), WithAlignment(AlignmentEnd)}},
want: resultYEndBytes,
wantErr: false,
},
{
name: "invalid axis",
args: args{images: []image.Image{img1, img2, img3}, options: []OptionFn{WithAxis(3), WithAlignment(AlignmentCenter)}},
want: nil,
wantErr: true,
},
{
name: "draw op src",
args: args{images: []image.Image{img1, img2, img3}, options: []OptionFn{WithDrawOp(draw.Src)}},
want: resultXSrcBytes,
wantErr: false,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got, err := Concat(tt.args.images, tt.args.options...)
if err != nil {
if tt.wantErr {
if got != nil {
t.Error("Concat() expected nil result with non-nil err")
}
return
}
t.Errorf("Concat() error = %v, wantErr %v", err, tt.wantErr)
return
}
var b bytes.Buffer
err = jpeg.Encode(&b, got, &jpeg.Options{Quality: 100})
if err != nil {
t.Error(err)
}
if !bytes.Equal(b.Bytes(), tt.want) {
t.Errorf("Concat() = %v, want %v", got, tt.want)
}
})
}
}