fix tests

app/src/main/java/sudoku/structure/MultiDoku.java

@@ -192,6 +192,26 @@ public class MultiDoku {
 		}
 	}
 
+	@Override
+	public boolean equals(Object other) {
+		if (!(other instanceof MultiDoku))
+			return false;
+		MultiDoku otherDoku = (MultiDoku) other;
+		if (this.getNbSubGrids() != otherDoku.getNbSubGrids())
+			return false;
+		for (int i = 0; i < this.getNbSubGrids(); i++) {
+			Sudoku sudoku = this.getSubGrid(i);
+			Sudoku otherSudoku = otherDoku.getSubGrid(i);
+			if (sudoku.getSize() != otherSudoku.getSize())
+				return false;
+			for (int j = 0; j < sudoku.getSize() * sudoku.getSize(); j++) {
+				if (sudoku.getCell(i).getSymbolIndex() != otherSudoku.getCell(i).getSymbolIndex())
+					return false;
+			}
+		}
+		return true;
+	}
+
 	public MultiDoku clone() {
 		// TODO: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaah
 		return SudokuSerializer.deserializeSudoku(SudokuSerializer.serializeSudoku(this));