Just wrote my first Visualforce page in Sandbox. How do I write a test for VF pages using standard controller on Cases?
If you have no extensions, then your page does not require any unit tests. In other words, if your page starts off like this:
<apex:page standardController="SomeObject"> <!-- rest of code -->
Then there's nothing to unit test, and you can freely deploy it to production without writing any unit tests. Unit tests are only for Apex Code.