/** * Install an OutputStreamStub into the given fieldName of the given walker. * * @param walker Walker into which to inject the field name. * @param fieldName Name of the field into which to inject the stub. */ private void installStub(Walker walker, String fieldName, OutputStream outputStream) { Field field = JVMUtils.findField(walker.getClass(), fieldName); JVMUtils.setFieldValue(field, walker, outputStream); }