
using Xunit;
using System;
using System.IO;

namespace ConsoleApp {
    public class ProgramTests {
        [Fact(DisplayName = "PrintTicTacToeBoard prints all three rows of the board")] 
        public void Prints_AllThreeRows() 
        {
            var sw = new StringWriter();
            Console.SetOut(sw);
            char[,] board = new char[3, 3]
            {
                { 'X', 'O', 'X' },
                { ' ', 'X', 'O' },
                { 'O', ' ', 'X' }
            };
            Program.PrintTicTacToeBoard(board);
            string output = sw.ToString();
            Assert.Contains("X | O | X", output);
            Assert.Contains("  | X | O", output);
            Assert.Contains("O |   | X", output);
            Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = true });
        }

        [Fact(DisplayName = "PrintTicTacToeBoard displays correct characters in order")] 
        public void Prints_CorrectCharactersInOrder() 
        {
            var sw = new StringWriter();
            Console.SetOut(sw);
            char[,] board = new char[3, 3]
            {
                { 'A', 'B', 'C' },
                { 'D', 'E', 'F' },
                { 'G', 'H', 'I' }
            };
            Program.PrintTicTacToeBoard(board);
            string output = sw.ToString();
            Assert.Contains("A | B | C", output);
            Assert.Contains("D | E | F", output);
            Assert.Contains("G | H | I", output);
            Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = true });
        }

        [Fact(DisplayName = "PrintTicTacToeBoard separates columns with | and rows with --+---+-- except after last row")] 
        public void Prints_SeparatorsCorrectly() 
        {
            var sw = new StringWriter();
            Console.SetOut(sw);
            char[,] board = new char[3, 3]
            {
                { '1', '2', '3' },
                { '4', '5', '6' },
                { '7', '8', '9' }
            };
            Program.PrintTicTacToeBoard(board);
            string output = sw.ToString();
            int separatorCount = output.Split(new string[] { "--+---+--" }, StringSplitOptions.None).Length - 1;
            Assert.Equal(2, separatorCount);
            Assert.Contains("1 | 2 | 3", output);
            Assert.Contains("4 | 5 | 6", output);
            Assert.Contains("7 | 8 | 9", output);
            Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = true });
        }
    }
}

ProgramTests.cs

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Challenge: Tic-Tac-Toe Board

Solution

Challenge: Tic-Tac-Toe Board

Solution