@Override
    public String uniqueHash() {
        return this.uniqueHash;
    }
@Test
    public void hashingWithOriginalSource() throws InvalidIRException {
        String source = "input { stdin {} } output { stdout {} }";
        PipelineIR pipelineIR = new PipelineIR(makeInputSection(), makeFilterSection(), makeOutputSection(), source);
        assertEquals(pipelineIR.uniqueHash(), Util.digest(source));
    }