Add unit tests for _default_stack_from_rotation_angle heuristics

[coderabbitai]

Context

The _default_stack_from_rotation_angle function in mdx2/data.py (lines 758-791) implements complex modulo-arithmetic heuristics across 8+ conditional branches to compute a reasonable image stack size given the rotation angle per frame.

Requirements

Add unit tests to validate the heuristics covering:

• Documented rotation angles: 0.1°, 0.025°, 1/3°, 0.04°, 0°
• Edge cases: very small angles (>0), very large angles (e.g., >6°)
• Specific modulo branches:
  • 5*denom%numer==0
  • 6*denom%numer==0
  • 2*50*numer%denom==0
  • 2*40*numer%denom==0
  • 2*45*numer%denom==0
  • 4*50*numer%denom==0
  • 4*45*numer%denom==0
  • Default fallback cases

Suggested Approach

Create a pytest file (e.g., tests/test_data_stack_size.py) with parametrized tests that:

1. Call _default_stack_from_rotation_angle with each test case
2. Assert the expected integer result for each input
3. Ensure all conditional branches are covered

Related

• PR Spm/44 prepare new release #45: Spm/44 prepare new release #45
• Discussion: Spm/44 prepare new release #45 (comment)
• Requested by: @spmeisburger
• Note: This issue replaces Add unit tests for _default_stack_from_rotation_angle heuristics ando-lab/mdx2#8 (created in wrong repository)