Gitterrätsel Testfälle

public class CrosswordPuzzleTest extends CrosswordPuzzleSolver {
    public static void main(String[] args) {
        System.out.println("SOMEWHERE OVER THE RAINBOW, WAY UP HIGH; THERE'S A LAND THAT I HEARD OF ONCE IN A LULLABY");
        mainTestBaby();
        System.out.println("\n\nSOMEWHERE OVER THE RAINBOW, SKIES ARE BLUE; AND THE DREAMS THAT YOU DARE TO DREAM REALLY DO COME TRUE");
        mainTestEasy();
        System.out.println("\n\nSCHEISSE, IN MEINEM KELLER LIEGT NE LEICHE ICH BINS NICH GEWESEN DOCH ICH KANN ES NICH BEWEISEN, SCHEISSE ÜBERALL IST BLUT DOCH ICH HAB ES NICH GETAN, WIE WERDE ICH SIE LOS, HAT DA JEMAND EINEN PLAN");
        katsching();
        System.out.println("\nKontrolliere ob alle Wörter, besonders im dritten Rätsel, nur einmal vorkommen.");
    }
    private static final void mainTestBaby() {
        int[][]gridSpec = {{0,0,7,0},{0,4,3,1}, {2,2,5,0},{0,9,4,1},{0,12,7,1},
                            {1,8,3,0},{2,9,5,0},{2,2,4,1},{3,6,5,0},{2,6,3,1},
                            {4,1,8,0},{5,0,7,0},{5,8,6,0},{4,8,4,1},{6,2,5,0},
                            {4,3,3,1},{4,4,5,1},{7,4,3,0},{7,8,3,0},{8,0,5,0},
                            {8,6,2,0},{8,10,4,0},{7,10,4,1},{9,12,3,1},{8,8,4,1},{7,6,4,1},
                            {8,1,4,1},{10,1,4,0},{10,4,2,1},{11,4,3,0},{10,9,4,0}};
        String[]wordsSpec = {"ELEFANT","INKA","NERVIG","PINK","EI",
                            "AXT","AUD","OMEGA","NERD","NOTEN",
                            "EITEL","DREI","LONG","DU","STEINIG",
                            "LOL","BIER","NUDEL","UHU","SCHEUNE",
                            "ELCH","ARE","EIS","DUDEN","SOS",
                            "SCHNULLI","RING","SPIEL","SEIL","MOPP",
                            "HEU"};

        if (0 == evaluateSpec(gridSpec, wordsSpec)) {
            printGrid(solvePuzzle(gridSpec, wordsSpec), false);
        }
    }

    private static final void mainTestEasy() {
        int[][] gridSpec = { {0,0,5,0},{0,2,8,1},{0,4,4,1},{3,1,4,0},{2,4,5,0},{1,7,6,1},{0,8,2,0},{4,5,3,0},{5,7,3,0},{5,9,3,1},{5,0,5,0},{7,0,6,0},{6,5,3,0} };
        String[] wordsSpec = {"NEW","FAN","ELF","WELLEN","SCHIFF","ECKIG","SEI","EI","EULE","FLUCH","ALPHA","PUMUCKEL","AFFE" };
        if (0 == evaluateSpec(gridSpec, wordsSpec)) {
            printGrid(solvePuzzle(gridSpec, wordsSpec), false);
        }
    }

    private static final void katsching() {
        int[][] gridSpec = { {0,0,4,0},{3,7,4,1},{1,1,4,1},{3,1,7,0},{0,3,6,1},{1,5,6,1},{5,3,7,0},{3,8,4,1},{0,9,3,1},{6,2,4,0} };
        String[] wordsSpec = {"SING","ERDE","DRACHEN","GIGANT","SCHUTT","TITANIK","IGIT","TOT","BLUT","NINA"};
        if (0 == evaluateSpec(gridSpec, wordsSpec)) {
            printGrid(solvePuzzle(gridSpec, wordsSpec), false);
        }
    }

    private static final void printGrid(char[][] grid, boolean gridFill) {
        if (grid != null