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regression_test.go
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regression_test.go
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package vips_test
import (
"io/ioutil"
"strings"
"testing"
"github.com/davidbyttow/govips"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestEmbed(t *testing.T) {
goldenTest(t, "fixtures/shapes.png", func(tx *vips.Transform) {
tx.Resize(512, 256)
})
}
func TestFlatten(t *testing.T) {
goldenTest(t, "fixtures/shapes.png", func(tx *vips.Transform) {
tx.BackgroundColor(vips.Color{255, 192, 203})
})
}
func TestResizeCrop(t *testing.T) {
goldenTest(t, "fixtures/colors.png", func(tx *vips.Transform) {
tx.Resize(100, 300).
ResizeStrategy(vips.ResizeStrategyCrop)
})
}
func TestResizeShapes(t *testing.T) {
goldenTest(t, "fixtures/shapes.png", func(tx *vips.Transform) {
tx.Resize(341, 256)
})
}
func TestRelativeResizeShapes(t *testing.T) {
goldenTest(t, "fixtures/shapes.png", func(tx *vips.Transform) {
tx.ScaleHeight(0.5)
})
}
func TestCenterCrop(t *testing.T) {
goldenTest(t, "fixtures/shapes.png", func(tx *vips.Transform) {
tx.Resize(341, 256).
ResizeStrategy(vips.ResizeStrategyCrop)
})
}
func TestBottomRightCrop(t *testing.T) {
goldenTest(t, "fixtures/shapes.png", func(tx *vips.Transform) {
tx.Resize(341, 256).
ResizeStrategy(vips.ResizeStrategyCrop).
Anchor(vips.AnchorBottomRight)
})
}
func TestOffsetCrop(t *testing.T) {
goldenTest(t, "fixtures/tomatoes.png", func(tx *vips.Transform) {
tx.Resize(500, 720).
CropOffsetX(120).
ResizeStrategy(vips.ResizeStrategyCrop)
})
}
func TestOffsetCropBounds(t *testing.T) {
goldenTest(t, "fixtures/tomatoes.png", func(tx *vips.Transform) {
tx.Resize(100, 100).
CropOffsetX(120).
ResizeStrategy(vips.ResizeStrategyCrop)
})
}
func TestRelativeOffsetCrop(t *testing.T) {
goldenTest(t, "fixtures/tomatoes.png", func(tx *vips.Transform) {
tx.Resize(500, 720).
CropRelativeOffsetX(0.1066).
ResizeStrategy(vips.ResizeStrategyCrop)
})
}
func goldenTest(t *testing.T, file string, fn func(t *vips.Transform)) {
if testing.Short() {
return
}
tx := vips.NewTransform().LoadFile(file)
fn(tx)
buf, err := tx.Apply()
require.NoError(t, err)
assertGoldenMatch(t, file, buf)
}
func assertGoldenMatch(t *testing.T, file string, buf []byte) {
i := strings.LastIndex(file, ".")
if i < 0 {
panic("bad filename")
}
goldenFile := file[:i] + "." + t.Name() + ".golden" + file[i:]
golden, _ := ioutil.ReadFile(goldenFile)
if golden != nil {
if !assert.Equal(t, golden, buf) {
failed := file[:i] + "." + t.Name() + ".failed" + file[i:]
err := ioutil.WriteFile(failed, buf, 0666)
if err != nil {
panic(err)
}
}
return
}
t.Log("Writing golden file: " + goldenFile)
err := ioutil.WriteFile(goldenFile, buf, 0644)
assert.NoError(t, err)
}