""" Tests for a tictactoe board evaluator """

import tictactoe as TTT

def test_no_winner_with_empty_board():
    board = [[None, None, None], [None, None, None], [None, None, None]]
    status = TTT.evaluate_board(board)
    assert status == 'no winner'

def test_no_winner_with_nonempty_board():
    board = [[None, None, None], [None, "x", "o"], [None, None, None]]
    status = TTT.evaluate_board(board)
    assert status == 'no winner'

def test_horizontal_winner_center():
    board = [[None, None, None], ["x", "x", "x"], [None, None, None]]
    status = TTT.evaluate_board(board)
    assert status == 'x wins'

def test_vertical_winner_left():
    board = [["x", "o", "o"], ["x", None, None], ["x", None, None]]
    status = TTT.evaluate_board(board)
    assert status == 'x wins'

def test_top_left_lower_right_diagonal():
    board = [["x", "o", "o"], [None, "x", None], ["o", None, "x"]]
    status = TTT.evaluate_board(board)
    assert status == 'x wins'

def test_top_right_lower_left_diagonal():
    board = [["o", "o", "x"], [None, "x", None], ["x", None, "o"]]
    status = TTT.evaluate_board(board)
    assert status == 'x wins'