Add anisotropic edge-case tests for SegResNetDS shape validation

[Talhax55z]

Follow-up to #8797.

While working on the anisotropic analysis in #8797, I noticed that shape_factor() and is_valid_shape() in SegResNetDS had no direct unit test coverage for the anisotropic path. This PR adds tests for:

• isotropic mode across 2D and 3D
• anisotropic mode with resolution set
• valid and invalid inputs to is_valid_shape()
• mixed validity (one dimension invalid, others valid)
• the ValueError raised by the forward pass on invalid shapes

No runtime code changed. This is a test-only contribution.

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📝 Walkthrough

Walkthrough

Adds tests/test_segresnet_ds.py. The tests check shape_factor() for isotropic and anisotropic 2D and 3D configurations. They check is_valid_shape() for divisible and non-divisible shapes. They also expect a forward pass to raise ValueError for invalid spatial dimensions.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 94aef

The added tests cover shape factors, mixed-validity inputs, and invalid-shape rejection without an identified behavioral mismatch. Mergeable subject to normal test checks.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: adding anisotropic edge-case tests for SegResNetDS shape validation.
Description check	✅ Passed	The description clearly explains the test coverage and states that no runtime code changed. It omits the template headings, issue reference, change-type checklist, and test execution status, but the c…
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 1 files.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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In `@tests/test_segresnet_ds.py`:
- Line 23: Add Google-style docstrings to the test methods
test_shape_factor_isotropic and the other definition lines identified in this
test module, documenting each parameter and the behavior under test; preserve
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[Talhax55z]

Hey @ericspod @KumoLiu all checks are green now. Rebased onto dev, added the Apache license header, and this is a test-only follow-up to #8797 (which you merged) adding coverage for the anisotropic path in shape_factor() / is_valid_shape(). Would you be able to take a look when you have a moment?

[Talhax55z]

Hi @ericspod @KumoLiu @Nic-Ma, this PR adds anisotropic edge-case tests for SegResNetDS shape validation. All CI checks are passing. Could you please take a look when you have time? Happy to make any changes. Thanks!