You could create the test bench Singapore by using a text editor. It would be a recommended method for verification of highly complex designs. It would enable you to make use of all available features in the HDL language. It would also provide you with flexibility in the verification of a suitable design.
Despite the method has been relatively more challenging, you should look forward to creating the code. However, the benefit would be that it might produce exact and accurate results rather than using the other available editor. It would also help you create a template for laying out the initial framework inclusive of initialization stimulus for your design.