def test_triangle_counts():
for row_count in range(1, 15):
triangle = single_panel_grid(row_count)
assert triangle.row_count == row_count
expected_cell_count = Geometry.triangular_number(row_count)
assert len(triangle) == len(triangle.cells) == expected_cell_count,\
f'cell count {len(triangle.cells)} != expected {expected_cell_count} with rows {row_count}'
# Each edge has the same number of elements are the number or total rows.
assert row_count == len(bottom_edge(triangle)) == len(
left_edge(triangle)) == len(right_edge(triangle))
def test_triangle_number():
for (n, number) in [(1, 1), (2, 4), (3, 9), (4, 16), (5, 25), (6, 36)]:
assert Geometry.triangular_number(n) == number