The existing tests only asserted len() on returned arrays and used verbose try/except error patterns, leaving dtype, shape, and cross-array consistency unverified.

Changes

Named constants

• BUNNY_N_POINTS = 30_571, PIPE_N_POINTS = 1_220 — eliminate magic numbers in new shape tests

Shape assertions (new tests verify 2-D structure, not just row count)

• points → (n, 3), color → (n, 3), intensity → (n, 1)
• Absent attributes return (0, 3) / (0, 1) rather than a flat empty array

Dtype assertions

• points is float64; color and intensity are float32

Cross-array consistency

• Full-attribute file: points, color, intensity share the same row count
• Partial-attribute file (bunnyFloat): absent arrays have 0 rows while points is non-empty

Value-range and transformation checks

• Float color values are in [0.0, 1.0]
• Spherical→Cartesian output is finite and always 3-column

raw_xml structure

• Asserts valid XML declaration and presence of e57Root element

Modern error-path tests

• pytest.raises equivalents for all existing try/except error tests; original tests retained

# Example of newly verified invariants
pc = e57.read_points("testdata/pipeSpherical.e57")
assert pc.points.shape  == (1_220, 3)   # was: len == 1_220
assert pc.points.dtype  == np.float64
assert pc.color.shape   == (1_220, 3)
assert pc.color.dtype   == np.float32
assert pc.intensity.shape == (1_220, 1)
assert np.all(pc.color >= 0.0) and np.all(pc.color <= 1.0)