text: 
  var assert = require('assert');
  
  var co = require('..');
  
  var ctx = {
    some: 'thing'
  };
  
  describe('co.call(this)', function () {
    it('should pass the context', function () {
      return co.call(ctx, function *(){
        assert(ctx == this);
      });
    })
  })
  