diff --git a/app/src/test/java/sudoku/solver/SolverTest.java b/app/src/test/java/sudoku/solver/SolverTest.java
index 4138326..85a38c4 100644
--- a/app/src/test/java/sudoku/solver/SolverTest.java
+++ b/app/src/test/java/sudoku/solver/SolverTest.java
@@ -8,11 +8,13 @@ import sudoku.structure.Sudoku;
 import sudoku.structure.SudokuFactory;
 
 import java.util.List;
+import java.util.Random;
 
 class SolverTest {
 
     @Test
     void solveTest() {
+        Random rand = new Random();
 
         MultiDoku dokuToTest = SudokuFactory.createBasicEmptySquareSudoku(3);
         MultiDoku dokuResult = SudokuFactory.createBasicEmptySquareSudoku(3);
@@ -56,7 +58,7 @@ class SolverTest {
 
         assert(dokuResult.isValid());
 
-        Solver.solveRandom(dokuToTest, );
+        Solver.solveRandom(dokuToTest, rand);
 
 
         System.out.println("\n****************************\nDoku solved");
@@ -81,13 +83,13 @@ class SolverTest {
                                                 5, ns, ns, ns,  3,  1,  0, ns, ns);
         sudokuToTest2.setImmutableCellsSymbol(immutableCells2);
 
-        boolean isSolved = Solver.solveRandom(dokuToTest2, );
+        boolean isSolved = Solver.solveRandom(dokuToTest2, rand);
 
         assert(!isSolved);
 
         MultiDoku dokuToTest3 = SudokuFactory.createBasicEmptySquareSudoku(3);
 
-        Solver.solveRandom(dokuToTest3, );
+        Solver.solveRandom(dokuToTest3, rand);
 
         SudokuPrinter.printRectangleSudoku(dokuToTest3.getSubGrid(0), 3, 3);
     }