def test_board_group_singular_but_multiple_boards():
"""Test that the singular function gets upset if there are multiple boards."""
board_group = BoardGroup(MockBoard, TwoBoardsMockBackend())
with pytest.raises(Exception):
board_group.singular()
def test_board_group_singular():
"""Test that the singular function works on a board group."""
board_group = BoardGroup(MockBoard, OneBoardMockBackend())
assert type(board_group.singular()) == MockBoard