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scaler_test.go
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scaler_test.go
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package thumbnail
import (
"os"
"path/filepath"
"testing"
)
var scalerTests = []struct {
scaler string
}{
{"NearestNeighbor"},
{"ApproxBiLinear"},
{"BiLinear"},
{"CatmullRom"},
}
// TestScalers tests different scalers.
func TestScalers(t *testing.T) {
config := Generator{
DestinationPath: "",
DestinationPrefix: "thumb_",
}
for _, tt := range scalerTests {
t.Run(tt.scaler, func(t *testing.T) {
config.Scaler = tt.scaler
t.Log(config)
gen := NewGenerator(config)
i, err := gen.NewImageFromFile(testJpegImagePath)
if err != nil {
t.Error(err)
}
teardownTestCase := setupTestCase(t)
dest := testDataPath + gen.DestinationPrefix + filepath.Base(i.Path)
defer teardownTestCase(t, dest)
thumbBytes, err := gen.CreateThumbnail(i)
if err != nil {
t.Error(err)
}
err = os.WriteFile(dest, thumbBytes, 0644)
if err != nil {
t.Error(err)
}
checkFileExists(t, dest)
var (
wantWidth = gen.Width
wantHeight = gen.Height
)
gotWidth, gotHeight, err := checkImageDimensions(dest)
if err != nil {
t.Error(err)
}
if wantWidth != gotWidth {
t.Errorf("checkImageDimensions() got %d, wants %d", gotWidth, wantWidth)
}
if wantHeight != gotHeight {
t.Errorf("checkImageDimensions() got %d, wants %d", gotHeight, wantHeight)
}
})
}
}
func TestInvalidScaler(t *testing.T) {
config := Generator{
DestinationPath: "",
DestinationPrefix: "thumb_",
Scaler: "",
}
gen := NewGenerator(config)
i, err := gen.NewImageFromFile(testJpegImagePath)
if err != nil {
t.Error(err)
}
errWant := ErrInvalidScaler
_, err = gen.CreateThumbnail(i)
if err != nil {
if err != errWant {
t.Errorf("Got unexpected error. Expected %s, got %s", errWant, err)
}
}
}