testing_common.go

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")
}