Prerparation, Execution, Verification

TTBoardTests.swift

func testWinnerHorizontally(){
        //PREPARATION
        //Prepare a board and mark position so that playerCode '1' wins
        let board = TTBoard(boardIDString: NSUUID().UUIDString)
        
        board.markPosition(0, playerCode: 1)
        board.markPosition(3, playerCode: 2)
        board.markPosition(1, playerCode: 1)
        board.markPosition(5, playerCode: 2)
        board.markPosition(2, playerCode: 1)
        
        //EXECUTION
        let winner = board.winner()
        
        //VERIFICATION
        let expectedWinner = 1;
        XCTAssertEqual(winner, expectedWinner, "Failed Horizontal Winner");
        
    }