fd-gulp-convert-encoding/test/test.js

convert file to assigned charset

'use strict';

var convertEncoding = require('../');
var should = require('should');
var File = require('gulp-util').File;
var Buffer = require('buffer').Buffer;
var fs = require('fs');
var Readable = require('stream').Readable;
var Path = require('path');
var jschardet = require('jschardet');

require('mocha');

describe('fd-gulp-convert-encoding', function() {
  describe('convertEncoding()', function() {

    it('should emit error if encoding param is empty', function(done) {   
      try {
        convertEncoding();
        done();
      } catch(err) {
        err.message.should.equal('encoding is empty');
        done();
      }

    });

    it('should emit error for stream files', function(done) {

      var streamFile = {
          isNull: function () { return false; },
          isStream: function () { return true; }
        };

      var stream = convertEncoding('utf-8');

      stream.on('error', function (err) {
          err.message.should.equal('Streaming not supported');
          done();
        });

      stream.write(streamFile);
    });

  	it('should convert the gbk file to utf-8 file', function(done) {
        var testDirectory = './source';
        var assets = Path.join(testDirectory, 'gbk.js');
        
        var stream = convertEncoding('utf-8');

        var fileAdata = fs.readFileSync(assets);

        var fileA = new File({
                path: assets,
                contents: fileAdata
            });

        stream.on('data', function(newFile){
            should.exist(newFile);
            should.exist(newFile.path);
            should.exist(newFile.relative);
            should.exist(newFile.contents);

            Buffer.isBuffer(newFile.contents).should.equal(true);

            var filebuffer = newFile.contents;

            var fileencoding = jschardet.detect(filebuffer).encoding;

            // gbk转成utf-8编码时，notepadd++中显示编码为ASCI as UTF-8,即windows-1252
            fileencoding.should.equal('windows-1252');
        });

        stream.on('end', function() {
        	done();
        });

        stream.write(fileA);

        stream.end();
    });

    it('should convert the utf-8 file to gb2312 file', function(done) {
        var testDirectory = './source';
        var assets = Path.join(testDirectory, 'utf.js');
        
        var stream = convertEncoding('gbk');

        var fileAdata = fs.readFileSync(assets);

        var fileA = new File({
                path: assets,
                contents: fileAdata
            });

        stream.on('data', function(newFile){
            should.exist(newFile);
            should.exist(newFile.path);
            should.exist(newFile.relative);
            should.exist(newFile.contents);

            Buffer.isBuffer(newFile.contents).should.equal(true);

            var filebuffer = newFile.contents;

            var fileencoding = jschardet.detect(filebuffer).encoding;

            fileencoding.should.equal('GB2312');
        });

        stream.on('end', function() {
            done();
        });

        stream.write(fileA);

        stream.end();
    });
  });
});

function stringStream() {
	var stream = new Readable();

	stream._read = function() {
		this.push('terin');
		this.push(null);
	};

	return stream;
}