vlang/vsl

test: add unit test suite for quaternion module

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#318 opened on Jul 14, 2026

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Description

quaternion/ has zero _test.v files despite a rich README documenting SLERP, NLERP, 3D rotations, interpolation, exponentiation, and parity operations.

Task

Add tests under quaternion/:

  1. quaternion/rotation_test.v — verify rotation matrices, axis-angle conversions, to/from matrix
  2. quaternion/interpolation_test.v — SLERP, NLERP with known reference values
  3. quaternion/basic_test.v — arithmetic, identity, norm, normalize

Verification

  • cd ~/.vmodules/vlang && v test vsl/quaternion
  • All operations tested with tolerance 1e-6

Contributor guide

Research direction
Study the quaternion module in `vsl/quaternion` to understand its public API and then write unit tests using V's built in test framework (`v test`) for rotation, interpolation, and basic operations, following the specified file structure and verification steps.
Tech stack
None
Domain
testing
Issue type
Test
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
V programmingunit testing concepts
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75