use exif-terminator

vendor/github.com/dsoprea/go-png-image-structure/v2/testing_common.go

@@ -0,0 +1,64 @@
+package pngstructure
+
+import (
+	"os"
+	"path"
+
+	"github.com/dsoprea/go-logging"
+)
+
+var (
+	assetsPath = ""
+)
+
+func getModuleRootPath() string {
+	moduleRootPath := os.Getenv("PNG_MODULE_ROOT_PATH")
+	if moduleRootPath != "" {
+		return moduleRootPath
+	}
+
+	currentWd, err := os.Getwd()
+	log.PanicIf(err)
+
+	currentPath := currentWd
+	visited := make([]string, 0)
+
+	for {
+		tryStampFilepath := path.Join(currentPath, ".MODULE_ROOT")
+
+		_, err := os.Stat(tryStampFilepath)
+		if err != nil && os.IsNotExist(err) != true {
+			log.Panic(err)
+		} else if err == nil {
+			break
+		}
+
+		visited = append(visited, tryStampFilepath)
+
+		currentPath = path.Dir(currentPath)
+		if currentPath == "/" {
+			log.Panicf("could not find module-root: %v", visited)
+		}
+	}
+
+	return currentPath
+}
+
+func getTestAssetsPath() string {
+	if assetsPath == "" {
+		moduleRootPath := getModuleRootPath()
+		assetsPath = path.Join(moduleRootPath, "assets")
+	}
+
+	return assetsPath
+}
+
+func getTestBasicImageFilepath() string {
+	assetsPath := getTestAssetsPath()
+	return path.Join(assetsPath, "libpng.png")
+}
+
+func getTestExifImageFilepath() string {
+	assetsPath := getTestAssetsPath()
+	return path.Join(assetsPath, "exif.png")
+}