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You are trying to use a non-static method called teacherTest that does not take any parameters. Where do you have that method defined? Hint: you don't.

When you say that your test class can't run it, what exactly do you mean? Do you have compiler errors? Something else?

We can't really help you with the errors until you tell us what those errors are. I suggest you throw together an SSCCE that demonstrates one problem at a time without any extra code, and we'll go...