File scssFile = new File("testcases/" + testCase + ".scss");
SassParser parser = new SassParser(new FileReader(scssFile));
SassSheet sheet = parser.parse(scssFile.getParentFile());
sheet = sheet.copy();
SassSheetEvaluator evaluator = new SassSheetEvaluator(new JavaStringInterpolator());
evaluator.evaluate(sheet);
ByteArrayOutputStream os = new ByteArrayOutputStream();