def test_its_data_becomes_invalid_if_updates_are_not_y_coordinate_consecutive(
):
grid = Grid(width=3, height=3)
setup_grid_cells(grid)
# all fine so far
grid._update_linebuffer(0)
assert grid.linebuffer[grid.linebuffer_index] == [1, 0, 0]
grid._update_linebuffer(2)
assert grid.linebuffer[grid.linebuffer_index] == [0, 0, 1]
# this'd be the correct value
assert grid.linebuffer[grid.linebuffer_prev_index] != [0, 1, 0]
# but instead has just the swapped old value, returning wrong data
assert grid.linebuffer[grid.linebuffer_prev_index] == [1, 0, 0]
def test_indexes_swap_when_updating_the_linebuffer():
irrelevant_y_coordinate = 1
grid = Grid(width=4, height=3)
grid._update_linebuffer(irrelevant_y_coordinate)
assert grid.linebuffer_index == 0
assert grid.linebuffer_prev_index == 1
grid._update_linebuffer(irrelevant_y_coordinate)
assert grid.linebuffer_index == 1
assert grid.linebuffer_prev_index == 0
grid._update_linebuffer(irrelevant_y_coordinate)
assert grid.linebuffer_index == 0
assert grid.linebuffer_prev_index == 1
def test_fills_current_index_with_y_coordinate_line():
grid = Grid(width=3, height=3)
setup_grid_cells(grid)
# this also works as edge-detection case
grid._update_linebuffer(0)
assert grid.linebuffer[grid.linebuffer_index] == [1, 0, 0]
# the other line should be empty
grid._update_linebuffer(1)
assert grid.linebuffer[grid.linebuffer_index] == [0, 1, 0]
assert grid.linebuffer[grid.linebuffer_prev_index] == [1, 0, 0]
grid._update_linebuffer(2)
assert grid.linebuffer[grid.linebuffer_index] == [0, 0, 1]
assert grid.linebuffer[grid.linebuffer_prev_index] == [0, 1, 0]
with context("grid setup"):
with it("linebuffer is created with appropiate width and always 2 lines"):
grid = Grid(width=4, height=3)
expect(len(grid.linebuffer)).to(equal(2))
expect(len(grid.linebuffer[0])).to(equal(grid.width))
with it("linebuffer indexes start with current=1, previous=0"):
grid = Grid(width=4, height=3)
expect(grid.linebuffer_index).to(equal(1))
expect(grid.linebuffer_prev_index).to(equal(0))
with it("when updating the linebuffer, indexes swap"):
irrelevant_y_coordinate = 1
grid = Grid(width=4, height=3)
grid._update_linebuffer(irrelevant_y_coordinate)
expect(grid.linebuffer_index).to(equal(0))
expect(grid.linebuffer_prev_index).to(equal(1))
grid._update_linebuffer(irrelevant_y_coordinate)
expect(grid.linebuffer_index).to(equal(1))
expect(grid.linebuffer_prev_index).to(equal(0))
grid._update_linebuffer(irrelevant_y_coordinate)
expect(grid.linebuffer_index).to(equal(0))
expect(grid.linebuffer_prev_index).to(equal(1))
with it("fills current index with y coordinate line"):
grid = Grid(width=3, height=3)
setup_grid_cells(grid)