ZPLify/zplgfa_test.go

package zplgfa

import (
	"image"
	_ "image/gif"
	_ "image/jpeg"
	_ "image/png"
	"log"
	"os"
	"testing"
	"strings"
)

func Test_CompressASCII(t *testing.T) {
	if str := CompressASCII("FFFFFFFF000000"); str != "NFL0" {
		t.Fatalf("CompressASCII failed")
	}
}

func Test_ConvertToZPL(t *testing.T) {
	// open file
	file, err := os.Open("./test.png")
	if err != nil {
		log.Printf("Warning: could not open the file: %s\n", err)
		return
	}

	defer file.Close()

	// load image head information
	config, format, err := image.DecodeConfig(file)
	if err != nil {
		log.Printf("Warning: image not compatible, format: %s, config: %v, error: %s\n", format, config, err)
	}

	// reset file pointer to the beginning of the file
	file.Seek(0, 0)

	// load and decode image
	img, _, err := image.Decode(file)
	if err != nil {
		log.Printf("Warning: could not decode the file, %s\n", err)
		return
	}

	// flatten image
	flat := FlattenImage(img)

	// convert image to zpl compatible type
	gfimg := ConvertToZPL(flat, CompressedASCII)
	
	// remove whitespace - only for the test
	gfimg = strings.Replace(gfimg, " ", "", -1)
	gfimg = strings.Replace(gfimg, "\n", "", -1)

	if gfimg != "^XA,^FS^FO0,0^GFA,32,51,3,,::01C000::,001C00::,1DDC00::,::^FS,^XZ" {
		t.Fatalf("ConvertToZPL failed")
	}
}