def test_to_osgb36_zipped_example():
gridrefs = ['HU431392', 'SJ637560', 'TV374354']
xy = bng.to_osgb36(gridrefs)
x, y = zip(*xy)
assert x == (443100, 363700, 537400)
assert y == (1139200, 356000, 35400)
def test_to_osgb36_arthurs_seat_example():
x, y = bng.to_osgb36('NT2755072950')
assert (x, y) == (327550, 672950)
def test_to_osgb36_throws_bng_error_on_bad_gridref_type(gridref):
with pytest.raises(bng.BNGError, match=r'Valid gridref inputs are.*'):
bng.to_osgb36(gridref)
def test_to_osgb36_calculates_correct_offset(gridref, expected):
coords = bng.to_osgb36(gridref)
assert coords[:2] == expected[:2]
def test_to_osgb36_handles_lower_case_input():
coords = bng.to_osgb36('sv0101')
assert coords == (1000, 1000)
def test_to_osgb36_expands_figures_correctly(gridref, expected):
# Test covers numbers below and over 5
coords = bng.to_osgb36(gridref)
assert coords == expected
def test_to_osgb36_throws_bng_error_on_invalid_100km_square(gridref):
with pytest.raises(bng.BNGError, match=r'Invalid 100 km grid square.*'):
bng.to_osgb36(gridref)