TicTacToeTest.java

import static org.junit.jupiter.api.Assertions.*;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

/**
 * The test class TicTacToeTest.
 *
 * @author  (your name)
 * @version (a version number or a date)
 */
public class TicTacToeTest
{
    /**
     * Default constructor for test class TicTacToeTest
     */
    public TicTacToeTest()
    {
    }

    /**
     * Sets up the test fixture.
     *
     * Called before every test case method.
     */
    @BeforeEach
    public void setUp()
    {
    }

    /**
     * Tears down the test fixture.
     *
     * Called after every test case method.
     */
    @AfterEach
    public void tearDown()
    {
    }

    @Test
    public void hasFreeCellTrue()  
    {
        String[][] board = {{" "," "," "},
                            {" "," "," "},
                            {" "," "," "}};
        assertEquals(true, TicTacToe.hasFreeCell(board));
    }
  
    @Test
    public void hasFreeCellFalse()  
    {
        String[][] board = {{"x","o","x"},
                            {"o","x","o"},
                            {"o","x","o"}};
        assertEquals(false, TicTacToe.hasFreeCell(board));
    }

    @Test
    public void displayIsEmpty()      
    {
        String[][] board = {{" "," "," "},
                            {" "," "," "},
                            {" "," "," "}};
        assertEquals("  012\n0|   |\n1|   |\n2|   |\n", TicTacToe.display(board));
    }
    
    
}