llmath's tests check what they say they check by RyeMutt · Pull Request #448 · AlchemyViewer/Alchemy

RyeMutt · 2026-10-12T05:50:08Z

Description

Fixes the bugs in llmath's own tests that the Catch2 conversion in #446 found and kept, since a conversion must not change what a test does. Each was a test that could not fail for the reason it existed, or checked something other than what it said. None of the corrected tests found a bug in llmath itself.

It follows #446, now on develop, and changes only indra/llmath/tests/.

Vectors, colours and rects (06a866b)

Subscripts (v3math, v3dmath, v4math, v4color): each element was compared with itself through a reference to it, which is always true. The cases now check that the non-const subscript is a reference to the component, and that writing through it writes the component.
LLSD round trips (v3math, v3dmath): the vectors were built from a scalar LLSD, but a vector reads sd[0..2], so every component was zero and the round trip compared zeros. They use arrays of three and check the components.
rotVec (v3math, v4math): two identical computations were compared. The cases now check:
- a quarter turn exactly;
- any angle about any axis, against Rodrigues' formula in double;
- the matrix form against the row-vector product;
- that a quaternion turn leaves w alone.
operator< (v3math): a trailing comma meant only x was ever compared. The case now checks x, then y, then z, and that no vector is less than itself.
v3color += / -=: the second half of each case repeated the first exactly. It now uses other values, and checks the returned reference.
llrect: a point check used (-0.0001, -0.001) where it meant (-0.0001, -0.0001), and equality compared a rect only with itself. Both outside sides are now checked, and each edge's part in equality.

xform and bounding boxes (01bf66b)

xform: isChanged(bits) is true when any of the bits is set, so two checks could not see what they claimed to. Each flag is now asked on its own. getMinMax checks the max corner, which it never did, starting from non-zero corners.
llbbox:
- the "with rotation" extent check tested the unrotated box again;
- addBBoxAgent was never called (the case named for it called addBBoxLocal), and two cases now test it.
llbboxlocal: a box with min above max was built and never looked at; its extent is now checked.

llquaternion (4712efa)

Quaternion from a matrix: the cases commented as tests of LLQuaternion(const LLMatrix4&) and (const LLMatrix3&) only filled matrices. New cases hold each constructor to the rotation the matrix was made from, including a translation and a turn past a half.
getEulerAngles: the case checked that the quaternion was still the identity, never the angles. It now checks the identity's angles, and round trips through setEulerAngles.
Small fixes: a repeated block of checks goes, an nlerp comment over a slerp call is corrected, and a doubled != "XYZ" becomes the two orders it left out.

mathmisc: nearestApproach runs again (10e1160)

History: DEV-16600 commented the test out because it failed now and then.
Cause: the failures were the test's own. It held LLLine::nearestApproach to the points it had built the two lines through, but building an LLLine in float moves it. Where the lines are near parallel, that moves their nearest points by more than the tolerance.
Evidence: across 50 seeds of 10,000 random pairs each, every pair stayed within tolerance of the nearest points worked out in double from the lines as built. Against the build points, 5 seeds in 20 failed.
The case now checks two lines whose nearest points are known exactly, and random pairs at a fixed seed held to the double reference.

Clean-up (938ef0f): llsdutil_math loses test_matches, a copy of llcommon's helper that no case here called. m3math loses a repeated pragma block.

Since review

v4math (a5472d0): the quaternion rotVec check turned the quaternion's own axis, which a turn leaves where it is, so a rotVec that did nothing would have passed. It now turns a vector off the axis. Pointed out by CodeRabbit.
The harness (c3f1e43): LLSDEquals compared reals and dates with ==. Under MSVC's /fp:fast, which the optimized Windows builds use, a NaN can compare equal to anything that way, so test_support_tests failed on Windows x64. It has failed there on develop since Test framework, stage 2: Catch2, its harness and converter, and llmath in one binary #446. NaN is now tested apart with std::isnan.

Related Issues

Please link to a relevant GitHub issue for additional context.

Issue Link: none. The bugs were found by #446's conversion and listed in bae1eeb's message.

Checklist

I have provided a clear title and detailed description for this pull request.
If useful, I have included media such as screenshots and video to show off my changes.
I have tested the changes locally and verified they work as intended.
All new and existing tests pass.
Code follows the project's style guidelines.
Documentation has been updated if needed.
Any dependent changes have been merged and published in downstream modules.
I have reviewed the contributing guidelines.

Additional Notes

Tested on macOS arm64, RelWithDebInfo, on develop at a78b91f:
- all 25 llmath_tests entries pass;
- the whole binary passes in random orders, at 55,711 assertions (55,428 before);
- the case and assertion counts of each file changed only where described above.
Not this PR's: the llcorehttp failure in the Windows x64 run was test 15, "HttpRequest GET with Content-Type", timing out after the Python peer's connection was aborted. llcorehttp's tests are TUT and untouched here.
Not changed: v4coloru's tests expect +, -, *, *= and %= to wrap modulo 256. That is how LLColor4U's arithmetic is written, not a bug in the test; making it saturate would change llmath itself.
Parity: these commits change what the tests check, so tut_parity.py no longer applies to them. That is by design: this is the "separate change" Test framework, stage 2: Catch2, its harness and converter, and llmath in one binary #446's description promised.

🤖 Generated with Claude Code

Bugs in the tests themselves, kept through the conversion to Catch2 and fixed here: - The subscript cases (v3math, v3dmath, v4math, v4color) compared each element with itself through a reference to it, which is always true. They now check that the non-const subscript is a reference to the component, and that writing through it writes the component. - The LLSD round trips (v3math, v3dmath) built the vector from a scalar LLSD, but a vector reads sd[0], sd[1] and sd[2], so every component was zero and the round trip compared zeros. They use arrays of three and check the components. v3math's assignment case had the same zero vector. - The rotVec cases (v3math, v4math) compared two identical computations. They now check a quarter turn exactly, any angle about any axis against Rodrigues' formula in double, the matrix product against its sum, and that the quaternion turn leaves w alone. - v3math's operator< case ran its last comparison through a trailing comma and only ever compared x; it now checks x, then y, then z, and strictness. Its operator!= case cleared one vector twice. - v3dmath set F64 values from float literals where nothing needed them; the one place that does (a trip through LLVector3) says why. - v3color's += and -= cases repeated their first halves exactly; the second halves use other values and check the returned reference. - llrect checked (-0.0001, -0.001) where it meant (-0.0001, -0.0001), and compared a rect only with itself; it now checks each side and each edge. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

…ed extent and addBBoxAgent - isChanged(bits) is true when any of the bits is set, so xform's isChanged(TRANSLATED | SCALED) after a setPosition could not tell whether setPosition kept SCALED, nor isChanged(TRANSLATED | ROTATED) whether setRotation set ROTATED. Each flag is asked on its own, with the flags that must stay clear. getMinMax's case checked the minimum corner twice and never the maximum, on vectors already zero; both corners are checked, starting from ones. - llbbox's "with rotation" extent check tested the unrotated box again. Its "addBBoxAgent" case called addBBoxLocal, so addBBoxAgent was never tested: two cases now do, into an empty box and into one at the origin. - llbboxlocal built a box with min above max and never looked at it; its extent is checked. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

…ngles back The cases commented as tests of LLQuaternion(const LLMatrix4&) and LLQuaternion(const LLMatrix3&) only filled matrices; the constructors were never called. Two cases now make a quaternion from each kind of matrix, translation and a turn past a half included, and hold it to the rotation the matrix was made from. getEulerAngles' case checked that the quaternion was still the identity, never the angles: it now checks the identity's angles and three round trips through setEulerAngles. A block of four checks repeated with nothing between went, a comment naming nlerp over a slerp call is corrected, and OrderToString's "not XYZ" check, made twice, is the two orders it left out. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

…rked in double DEV-16600 commented the test out for failing now and then. The failures were the test's: it held nearestApproach to the points it had built the two lines through, but making an LLLine in float moves it, and where the lines are near parallel that moves their nearest points by more than the tolerance. Against the nearest points worked out in double from the lines as made, nearestApproach held for 500,000 random pairs over 50 seeds, where against the built points 5 seeds in 20 failed. The case runs again, with two lines whose nearest points are known exactly, and the random pairs at a fixed seed held to the reference. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

…agma llsdutil_math's fixture held test_matches, a copy of llcommon's llsdutil_test helper for llsd_matches, which llcommon tests and no case here called; the fixture held nothing else, so the cases are plain TEST_CASEs and the includes only it used go. m3math disabled C4702 in two identical blocks. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

coderabbitai · 2026-10-12T05:51:06Z

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indra/llmath/tests/v4math_test.cpp
indra/test/altestmatchers.cpp
indra/test/tests/altestsupport_test.cpp

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📝 Summary

Summary by CodeRabbit

Tests
- Expanded math test coverage for bounding boxes, quaternions, rectangles, vectors, colors, transforms, and nearest-point calculations.
- Added checks for edge cases, component updates, rotations, comparisons, and expected numerical results.
- Improved validation of LLSD numeric comparisons, including NaN handling.

📝 Summary

Walkthrough

The pull request expands math tests with checks for calculated results, component behavior, and LLSD round trips. It enables a seeded nearest-approach test and updates LLSD matchers to reject NaN comparisons.

Changes

Math Test Coverage

Layer / File(s)	Summary
Geometry bounds and transform tests `indra/llmath/tests/llbbox_test.cpp`, `indra/llmath/tests/llbboxlocal_test.cpp`, `indra/llmath/tests/llrect_test.cpp`, `indra/llmath/tests/xform_test.cpp`	Tests cover bounding-box extents and addition, rectangle equality and containment, and transform flags and bounds.
Quaternion conversion and angle tests `indra/llmath/tests/llquaternion_test.cpp`	Tests cover matrix conversion, Euler-angle round trips, axis-order strings, and interpolation labels.
Vector and color behavior tests `indra/llmath/tests/v3dmath_test.cpp`, `indra/llmath/tests/v3math_test.cpp`, `indra/llmath/tests/v3color_test.cpp`, `indra/llmath/tests/v4color_test.cpp`, `indra/llmath/tests/v4math_test.cpp`	Tests check vector construction, LLSD parsing, rotation, ordering, indexing, and compound color assignment return values.
Line nearest-approach test `indra/llmath/tests/mathmisc_test.cpp`	The enabled test checks known nearest points and 100 seeded random cases against a double-precision reference.
LLSD test isolation and warning cleanup `indra/llmath/tests/llsdutil_math_test.cpp`, `indra/llmath/tests/m3math_test.cpp`	LLSD round-trip cases become standalone tests. The test file removes a Windows-specific warning suppression.

LLSD NaN Comparison

Layer / File(s)	Summary
NaN comparison and matcher test `indra/test/altestmatchers.cpp`, `indra/test/tests/altestsupport_test.cpp`	LLSD matcher comparisons reject NaN real values and date seconds. A test checks that NaN does not match zero.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to a5472

The revised quaternion test checks an actual rotation. The NaN matcher’s behavior under optimized MSVC is still unconfirmed, but no concrete failure is established; there is no demonstrated merge-blocking risk.

Pre-merge checks | 4 | 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 14 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Title check		The title clearly identifies the main change: correcting llmath tests so they verify their stated behavior. It is concise and specific.
Description check		The description is detailed and follows the repository template. It explains the motivation, affected tests, validation results, related context, and checklist status. No issue link is provided, but t…

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🧹 Nitpick comments (1)

indra/llmath/tests/v4math_test.cpp (1)

235-235: 🎯 Functional Correctness | 🔵 Trivial | ⚡ Quick win

Use a nonparallel vector for the general quaternion check.

vec4b is parallel to q's axis, so an incorrect no-op implementation can still match turned. Use a nonparallel vector in both expressions.

Suggested test correction

-        LLVector4 vec4b(2.32f, -23.2f, -34.1112f, 1.010112f);
+        LLVector4 vec4b(1.f, 0.f, 0.f, 1.010112f);
         vec4b.rotVec(q);
-        const LLVector3 turned = LLVector3(2.32f, -23.2f, -34.1112f) * q;
+        const LLVector3 turned = LLVector3(1.f, 0.f, 0.f) * q;

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Review comment at @indra/llmath/tests/v4math_test.cpp at line 235:
Update the general quaternion check using vec4b and turned to use the same
vector that is nonparallel to q’s axis, so a no-op rotVec implementation cannot
pass; keep both expressions consistent.

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only still-valid issues, skip the rest with a brief reason, keep changes
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Nitpick comments:
Review comments at @indra/llmath/tests/v4math_test.cpp:
- Line 235: Update the general quaternion check using vec4b and turned to use
the same vector that is nonparallel to q’s axis, so a no-op rotVec
implementation cannot pass; keep both expressions consistent.

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📒 Files selected for processing (13)

indra/llmath/tests/llbbox_test.cpp
indra/llmath/tests/llbboxlocal_test.cpp
indra/llmath/tests/llquaternion_test.cpp
indra/llmath/tests/llrect_test.cpp
indra/llmath/tests/llsdutil_math_test.cpp
indra/llmath/tests/m3math_test.cpp
indra/llmath/tests/mathmisc_test.cpp
indra/llmath/tests/v3color_test.cpp
indra/llmath/tests/v3dmath_test.cpp
indra/llmath/tests/v3math_test.cpp
indra/llmath/tests/v4color_test.cpp
indra/llmath/tests/v4math_test.cpp
indra/llmath/tests/xform_test.cpp

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indra/llmath/tests/m3math_test.cpp

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The optimised Windows builds compile with /fp:fast, under which MSVC may compile == without its test for an unordered result. A NaN then compares equal to any number. LLSDEquals compared reals and dates' seconds with ==, so on Windows x64 a NaN date matched LLDate(0.0), and test_support_tests failed there, as it has on develop since #446. clang and GCC keep IEEE comparisons under the flags the tree gives them, so no other row saw it. Reals and dates now go through a compare that asks about NaN apart, with std::isnan, which classifies the bits and so holds under /fp:fast. The harness's tests check a NaN real as well as a NaN date. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

The vector it turned was the quaternion's own axis, which a turn leaves where it is, so a rotVec that did nothing would have passed. It turns (1, 2, 3) now, which the turn moves: with the rotVec call taken out, the check fails. Pointed out in review. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

RyeMutt and others added 5 commits October 12, 2026 01:49

github-actions Bot added c/cpp llmath labels Oct 12, 2026

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RyeMutt mentioned this pull request Oct 12, 2026

Test framework, stage 3: the small libraries' tests in Catch2 #449

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RyeMutt and others added 2 commits October 12, 2026 03:08

RyeMutt merged commit 5b7ba1c into develop Oct 12, 2026
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RyeMutt deleted the rye/llmath-test-fixes branch October 12, 2026 09:22

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llmath's tests check what they say they check - #448

llmath's tests check what they say they check#448
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