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"""Test the pypdf.papersizes module."""
import pytest
from pypdf import papersizes
def test_din_a0_paper_size():
"""The dimensions and area of the DIN A0 paper size are correct."""
dim = papersizes.PaperSize.A0
area_square_pixels = float(dim.width) * dim.height
# 72 pixels is 1 inch
area_square_inch = area_square_pixels / 72**2
# 25.4 millimeter is equal to 1 inches
area_square_mm = area_square_inch * (25.4) ** 2
assert abs(area_square_mm - 999949) < 100
conversion_factor = 72 / 25.4
assert (dim.width - 841 * conversion_factor) < 1
assert (dim.width - 1189 * conversion_factor) < 1
@pytest.mark.parametrize("dimensions", papersizes._din_a)
def test_din_a_aspect_ratio(dimensions):
"""The aspect ratio of DIN A paper sizes is correct."""
assert abs(dimensions.height - dimensions.width * 2**0.5) <= 2.5
@pytest.mark.parametrize(
("dimensions_a", "dimensions_b"),
list(zip(papersizes._din_a, papersizes._din_a[1:])),
)
def test_din_a_size_doubling(dimensions_a, dimensions_b):
"""The height of a DIN A paper size doubles when moving to the next size."""
assert abs(dimensions_a.height - 2 * dimensions_b.width) <= 4
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