@Override
	protected AbstractPSystem executeLine(String line) {
		final String lineLower = line.toLowerCase();
		if (lineLower.equals("listfont") || lineLower.equals("listfonts") || lineLower.startsWith("listfont ")
				|| lineLower.startsWith("listfonts ")) {
			final int idx = line.indexOf(' ');
			return new PSystemListFonts(idx == -1 ? "This is a test" : line.substring(idx).trim());
		}
		return null;
	}