Can't get bitmap from drawable (Robolectric) - android

I am trying to retrieve a bitmap and save to my local disk on PC.
As a result I get a jpeg file (95 bytes) which cannot be read.
source:
Application application = new MyApplication();
Bitmap bitmap = BitmapFactory.decodeResource(application.getResources(), drawableId);
File outputFile = new File("D:\\OutputFile.jpg");
OutputStream os = new FileOutputStream(outputFile);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, os);
IoUtils.closeSilently(os); //close stream
P.S. I know that I can't get bitmap from drawable. But I don't know why...

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