Sudoku Basic unit tests

Board.java

package sudoku;

import static org.junit.Assert.*;

import java.util.Arrays;

import org.junit.Before;
import org.junit.Test;

public class BoardTest {

	private int[][] sudoku = {
			{8,6,0,0,2,0,0,0,0},
			{0,0,0,7,0,0,0,5,9},
			{0,0,0,0,0,0,0,0,0},
			{0,0,0,0,6,0,8,0,0},
			{0,4,0,0,0,0,0,0,0},
			{0,0,5,3,0,0,0,0,7},
			{0,0,0,0,0,0,0,0,0},
			{0,2,0,0,0,0,6,0,0},
			{0,0,7,5,0,9,0,0,0}
	};
	private Board board;
	
	@Before
	public void initBoard() {
		board = new Board(sudoku);
	}

	@Test
	public void testGetRow() {
		int[] row5 = {0,0,5,3,0,0,0,0,7};
		assertTrue(Arrays.equals(row5, board.getRow(5)));
	}

	@Test
	public void testGetColumn() {
		int[] col5 = {0,0,0,0,0,0,0,0,9};
		assertTrue(Arrays.equals(col5, board.getColumn(5)));
	}

	@Test
	public void testGetRegion() {
	    int[] region3 = {0,0,0,0,5,9,0,0,0};
	    assertTrue(Arrays.equals(region3, board.getRegion(2, 8)));
	}

	@Test
	public void testGetCell() {
		assertEquals(4,board.getCell(4, 1));
	}

	@Test
	public void testSetCell() {
		board.setCell(4, 1, 2);
		assertEquals(2,board.getCell(4, 1));
	}

	@Test
	public void testToString() {
		final String expectedOutput = 
				" -------------------------\n" + 
				" | 8 6 _ | _ 2 _ | _ _ _ |\n" + 
				" | _ _ _ | 7 _ _ | _ 5 9 |\n" + 
				" | _ _ _ | _ _ _ | _ _ _ |\n" + 
				" -------------------------\n" + 
				" | _ _ _ | _ 6 _ | 8 _ _ |\n" + 
				" | _ 4 _ | _ _ _ | _ _ _ |\n" + 
				" | _ _ 5 | 3 _ _ | _ _ 7 |\n" + 
				" -------------------------\n" + 
				" | _ _ _ | _ _ _ | _ _ _ |\n" + 
				" | _ 2 _ | _ _ _ | 6 _ _ |\n" + 
				" | _ _ 7 | 5 _ 9 | _ _ _ |\n" + 
				" -------------------------\n"; 
		assertEquals(expectedOutput, board.toString());
	}
}

Solver.java

package sudoku;

import static org.junit.Assert.*;

import java.util.Arrays;

import org.junit.Before;
import org.junit.Test;

public class SolverTest {

	private int[][] sudoku = {
			{8,6,0,0,2,0,0,0,0},
			{0,0,0,7,0,0,0,5,9},
			{0,0,0,0,0,0,0,0,0},
			{0,0,0,0,6,0,8,0,0},
			{0,4,0,0,0,0,0,0,0},
			{0,0,5,3,0,0,0,0,7},
			{0,0,0,0,0,0,0,0,0},
			{0,2,0,0,0,0,6,0,0},
			{0,0,7,5,0,9,0,0,0}
	};
	private int[] sortedLine = {1,2,3,4,5,6,7,8,9};
	private Solver solver;

	
	@Before
	public void initSolver() {
		solver = new Solver(sudoku);
	}
	
	@Test
	public void testSolve() {
		solver.solve();
		verifySolved(sudoku);
	}
	
	@Test
	public void testGetBoard() {
		Board b = solver.getBoard();
		for (int i=0;i < Board.GRID_SIZE; i++) {
			assertArrayEquals(sudoku[i], b.getRow(i));
		}
	}
	
	private void verifySolved(int[][] toVerify) {
		Board b = new Board(toVerify);
		// Check all lines and columns
		for (int i=0;i < Board.GRID_SIZE; i++) {
			assertTrue(isArrayOk(b.getRow(i)));
			assertTrue(isArrayOk(b.getColumn(i)));
		}
		// Check all regions
		for (int x=0; x < Board.REGION_SIZE; x++)
			for (int y=0; y < Board.REGION_SIZE; y++) {
				int row = x*Board.REGION_SIZE;
				int col = y*Board.REGION_SIZE;
				assertTrue(isArrayOk(b.getRegion(row, col)));
			}
				
	}
	
	private boolean isArrayOk(int[] toVerify) {
		int[] copy = Arrays.copyOf(toVerify, Board.GRID_SIZE);
		Arrays.sort(copy);
		return Arrays.equals(sortedLine, copy);
	}

}