/**
* 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);
}
