How to unit test a method that reads a given file

Question

I know this is a bit naive. How to unit test this piece of code without giving physical file as input. I am new to mockito and unit testing. So I am not sure. Please help.

Answer 1

Why do you wanna mock a file? Mocking java.io.File is a bad idea as it has loads of native stuff. I would advice you to ensure that a minimalist text file is available in classpath when the unit tests are run. You can convert this file to text and confirm the output.