如何测试按钮单击是否打开带有NUnitForms的新表单？

I'm new to C# and trying to write a simple GUI Unit Test with NUnit and NUnitForms. I want to test if a click on a button opens a new Form. My application has two forms, the main form (Form1) with a button that opens a new form (Password):I'm new to C# and trying to write a simple GUI