Trying to write a test with SineJS

gistfile1.js

var fs = require('fs');
var path = require('path');

...

var file = path.join(__dirname, '..', 'tmp', 'todo.txt');

...

  describe('.export()', function(done) {
    it('should save todos to a file', function(done) {
      sinon.stub(storage, 'get', function(key, cb) {
        cb(null, [{text: 'Foo', done: false}]);
      });

      sinon.stub(commands, 'export', function(file) {
        fs.readFileSync(file, 'utf8').should.eql('     #1  \u001b[31m✖\u001b[39m  Foo');
        done();
      });

      commands.export(file);
    });
  });