104 lines
2.4 KiB
Go
104 lines
2.4 KiB
Go
// Copyright 2017 The goimagehash Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package goimagehash
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import (
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"errors"
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"image"
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_ "image/jpeg"
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"os"
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"reflect"
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"runtime"
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"testing"
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)
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func TestNewImageHash(t *testing.T) {
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for _, tt := range []struct {
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datas [][]uint8
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hash1 Kind
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hash2 Kind
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distance int
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err error
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}{
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{[][]uint8{{1, 0, 1, 1}, {0, 0, 0, 0}}, Unknown, Unknown, 3, nil},
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{[][]uint8{{0, 0, 0, 0}, {0, 0, 0, 0}}, Unknown, Unknown, 0, nil},
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{[][]uint8{{0, 0, 0, 0}, {0, 0, 0, 1}}, Unknown, Unknown, 1, nil},
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{[][]uint8{{0, 0, 0, 0}, {0, 0, 0, 1}}, Unknown, AHash, -1, errors.New("Image hashes's kind should be identical")},
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} {
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data1 := tt.datas[0]
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data2 := tt.datas[1]
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hash1 := NewImageHash(0, tt.hash1)
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hash2 := NewImageHash(0, tt.hash2)
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for i := 0; i < len(data1); i++ {
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if data1[i] == 1 {
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hash1.Set(i)
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}
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}
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for i := 0; i < len(data2); i++ {
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if data2[i] == 1 {
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hash2.Set(i)
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}
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}
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dis, err := hash1.Distance(hash2)
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if dis != tt.distance {
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t.Errorf("Distance between %v and %v expected as %d but got %d", data1, data2, tt.distance, dis)
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}
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if err != nil && err.Error() != tt.err.Error() {
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t.Errorf("Expected err %s, actual %s", tt.err, err)
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}
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}
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}
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func TestSerialization(t *testing.T) {
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checkErr := func(err error) {
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if err != nil {
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t.Errorf("%v", err)
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}
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}
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methods := []func(img image.Image) (*ImageHash, error){
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AverageHash, PerceptionHash, DifferenceHash,
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}
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examples := []string{
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"_examples/sample1.jpg", "_examples/sample2.jpg", "_examples/sample3.jpg", "_examples/sample4.jpg",
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}
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for _, ex := range examples {
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file, err := os.Open(ex)
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checkErr(err)
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defer file.Close()
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img, _, err := image.Decode(file)
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checkErr(err)
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for _, method := range methods {
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methodStr := runtime.FuncForPC(reflect.ValueOf(method).Pointer()).Name()
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hash, err := method(img)
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checkErr(err)
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hex := hash.ToString()
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// len(kind) == 1, len(":") == 1, len(hash) == 16
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if len(hex) != 18 {
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t.Errorf("Got invalid hex string '%v'; %v of '%v'", hex, methodStr, ex)
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}
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reHash, err := ImageHashFromString(hex)
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checkErr(err)
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distance, err := hash.Distance(reHash)
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checkErr(err)
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if distance != 0 {
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t.Errorf("Original and unserialized objects should be identical, got distance=%v; %v of '%v'", distance, methodStr, ex)
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}
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}
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}
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}
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