Using Mockito and Junit5 get past a try statement with InputStream?

aI'm trying to test code which is inside a try-catch statement such as:

@Service
public class DoSomething {

  public void uploadFile(String filename) {
   try{
    File file = new File(filename + ".txt");
    ByteArrayInputStream byteInputStream = new ByteArrayInputStream(FileUtils.readFileToByteArray(file));
//   ...other code
     method2(filename)
// ... more code
   } catch(...) {...}
 }

public void method2(filename){...do something here}
}

I want to test what's inside of the try statement however I'm unable to mock the InputStream so it just goes straight to the catch statement when I try to Spy on uploadFile. How can I mock the InputStream so it returns a file I have in the temp folder or just not go to the catch statement such that I may test the rest of my code. i.e.) I'm trying to verify method2 will be within the uploadFile method.