gistfile1.js

require('/shared/js/l10n.js');
//mocha.setup({globals: ['jsCount', 'totalResult']});

suite('l10n', function(done) {

  var _;

  suiteSetup(function() {
    _ = navigator.mozL10n.get;
    var script = document.createElement('script');
    script.type = 'application/l10n';
    var foo = {
      'locales':
      {
        'en-US':
        {
          'foo': {'textContent': 'foo-translated'}
        }
      }
    };
    script.innerHTML = JSON.stringify(foo);
    document.body.appendChild(script);
  });

  suite('get', function() {
    test('inexisting key', function() {
      assert.strictEqual(_('bla'), '');
    });

    test('existing key', function() {
      assert.strictEqual(_('foo'), 'foo-translated');
    });

  });

});