Testing console based applications/programs – Java

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Why not write your application to take a Reader as input? That way, you can easily replace an InputStreamReader(System.in) with a FileReader(testFile)

public class Processor {
    void processInput(Reader r){ ... }
}

And then two instances:

Processor live = new Processor(new InputStreamReader(System.in));
Processor test = new Processor(new FileReader("C:/tmp/tests.txt");

Getting used to coding to an interface will bring great benefits in almost every aspect of your programs!

Note also that a Reader is the idiomatic way to process character-based input in Java programs. InputStreams should be reserved for raw byte-level processing.

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