Mocking Java InputStream

Question

Please provide pointers to help me mock that java InputStream object. This is the line of code that I would wish to Mock:

InputStreamReader inputData = new I         


        

Answer 1

Change your object so it is easier to test, something like this:

public MyObject {
    private InputStream inputStream;

    public void setInputStream(InputStream inputStream) {this.inputStream = inputStream;}

    public void whatever() {
        InputStreamReader inputData = new InputStreamReader(inputStream);
        bufferdReader = new BufferedReader(inputData);
        bufferdReader.readLine(); 
    }
}

then when you use your object initialize its inputStream first:

MyObject myObject = new MyObject();
myObject.setInputStream(System.in);

Now you have an object where you can test it using any implementation of InputStream you want (ByteArrayInputStream is a good one to try).