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add unit test for density_points method of snap #21

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Merged
hfoote merged 1 commit into from
Jan 13, 2026
Merged

add unit test for density_points method of snap #21

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15 changes: 14 additions & 1 deletion tests/snap_unit_test.py
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Original file line number Diff line number Diff line change
Expand Up @@ -62,7 +62,7 @@ def test_can_read_masstable(dm_snap):
assert dm_snap.read_masstable() == 0.001799996432347745, "Failed to read masstable!"


def test_can_select_particles(dm_snap):
def test_can_select_particles_by_id_range(dm_snap):
min_id = 1000
max_id = 2000
dm_snap.select_particles((min_id, max_id))
Expand All @@ -87,3 +87,16 @@ def test_centering(dm_snap):
dm_snap.find_velocity_center(com),
np.array([-2.337177, -0.104841, -1.221633]) * u.km / u.s,
), "Velocity center calculation failed!"


def test_density_points_returns_correct_central_density(dm_snap):
k = 100
central_density = dm_snap.density_points(
np.zeros(3), k_max=k
)[0].value

particle_radii = np.sqrt(np.sum(dm_snap.data_fields['Coordinates']**2, axis=1))
volume = 4.0 * np.pi / 3.0 * (np.partition(particle_radii, k-1)[k-1])**3
emp_density = (dm_snap.data_fields['Masses'][0] * k / volume).value

assert np.abs(central_density/emp_density - 1) < 1e-6