Scanner scanner = new ScannerImpl(reader);
Mark dummy = new Mark("dummy", 0, 0, 0, "", 0);
LinkedList<Token> etalonTokens = new LinkedList<Token>();
etalonTokens.add(new StreamStartToken(dummy, dummy));
etalonTokens.add(new BlockMappingStartToken(dummy, dummy));
etalonTokens.add(new KeyToken(dummy, dummy));
etalonTokens.add(new ScalarToken("string", true, dummy, dummy, (char) 0));
etalonTokens.add(new ValueToken(dummy, dummy));
etalonTokens.add(new ScalarToken("abcd", true, dummy, dummy, (char) 0));
etalonTokens.add(new BlockEndToken(dummy, dummy));
etalonTokens.add(new StreamEndToken(dummy, dummy));