chardet/test/chardet.js

var assert = require('assert'),
  chardet = require('../'),
  fs = require('fs');

describe('chardet', function() {

  var path = __dirname + '/data/encodings/utf8';
  var expectedEncodingsFromPath = JSON.stringify([
    { 'confidence': 100, 'name': 'UTF-8', 'lang': undefined },
    { 'confidence': 32, 'name': 'windows-1252', 'lang': 'fr' },
    { 'confidence': 19, 'name': 'KOI8-R', 'lang': undefined },
    { 'confidence': 10, 'name': 'Big5', 'lang': undefined },
    { 'confidence': 10, 'name': 'GB18030', 'lang': undefined },
    { 'confidence': 10, 'name': 'windows-1253', 'lang': undefined },
    { 'confidence': 6, 'name': 'windows-1250', 'lang': 'pl' },
    { 'confidence': 4, 'name': 'windows-1254', 'lang': undefined },
    { 'confidence': 2, 'name': 'windows-1251', 'lang': undefined }
  ]);

  describe('#detect', function() {
    it('should detect encoding', function() {
      assert.equal(chardet.detect(fs.readFileSync(path)), 'UTF-8');
    });

    it('should return a list of encodings, sorted by confidence level in decending order', function() {
      var matches = chardet.detect(fs.readFileSync(path), { returnAllMatches: true });
      assert.equal(JSON.stringify(matches), expectedEncodingsFromPath);
    });
  });

  describe('#detectFile', function() {
    it('should detect encoding', function(done) {
      chardet.detectFile(path, function(err, res) {
        assert.equal(err, null);
        assert.equal(res, 'UTF-8');
        done();
      });
    });

    it('should detect encoding with smaller sample size', function(done) {
      chardet.detectFile(path, { sampleSize: 32 }, function(err, res) {
        assert.equal(err, null);
        assert.equal(res, 'UTF-8');
        done();
      });
    });

    it('should return a list of encodings, sorted by confidence level in decending order', function() {
      chardet.detectFile(path, { returnAllMatches: true }, function(err, res) {
        assert.equal(err, null);
        assert.equal(JSON.stringify(res), expectedEncodingsFromPath);
        done();
      });
    });

    it('should return a list of encodings even with smaller sample size, sorted by confidence level in decending order', function() {
      chardet.detectFile(path, { sampleSize: 32, returnAllMatches: true }, function(err, res) {
        assert.equal(err, null);
        assert.equal(JSON.stringify(res), expectedEncodingsFromPath);
        done();
      });
    });
  });

  describe('#detectFileSync', function() {
    it('should detect encoding', function() {
      assert.equal(chardet.detectFileSync(path), 'UTF-8');
    });

    it('should detect encoding with smaller sample size', function() {
      assert.equal(chardet.detectFileSync(path, { sampleSize: 32 }), 'UTF-8');
    });

    it('should return a list of encodings, sorted by confidence level in decending order', function() {
      var matches = chardet.detectFileSync(path, { returnAllMatches: true });
      assert.equal(JSON.stringify(matches), expectedEncodingsFromPath);
    });

    it('should return a list of encodings even with smaller sample size, sorted by confidence level in decending order', function() {
      var matches = chardet.detectFileSync(path, { sampleSize: 32, returnAllMatches: true });
      assert.equal(JSON.stringify(matches), JSON.stringify([
        {'confidence': 100, 'name': 'UTF-8', 'lang': undefined},
        {'confidence': 10, 'name': 'Shift-JIS', 'lang': undefined},
        {'confidence': 10, 'name': 'windows-1252', 'lang': 'it'},
        {'confidence': 10, 'name': 'windows-1250', 'lang': 'hu'},
        {'confidence': 10, 'name': 'windows-1253', 'lang': undefined},
        {'confidence': 10, 'name': 'windows-1251', 'lang': undefined}
      ]));
    });
  });
});