test: ztest: Add math basic trigonometry unit tests converted from CMock

[tmleman]

This patch converts 9 existing math trigonometry unit tests from CMock/Unity to Zephyr's Ztest framework, maintaining the same test coverage and functionality:

• test_sin_32b_fixed: 32-bit fixed-point sine function
• test_sin_16b_fixed: 16-bit fixed-point sine function
• test_cos_32b_fixed: 32-bit fixed-point cosine function
• test_cos_16b_fixed: 16-bit fixed-point cosine function
• test_asin_32b_fixed: 32-bit fixed-point arcsine function
• test_asin_16b_fixed: 16-bit fixed-point arcsine function
• test_acos_32b_fixed: 32-bit fixed-point arccosine function
• test_acos_16b_fixed: 16-bit fixed-point arccosine function
• test_sin_lut_16b_fixed: 16-bit sine lookup table function

Original tests converted from sof/test/cmocka/src/math/trig/ authored by:

• Slawomir Blauciak slawomir.blauciak@linux.intel.com
• Shriram Shastry malladi.sastry@linux.intel.com
• Seppo Ingalsuo seppo.ingalsuo@linux.intel.com

The converted tests validate the same trigonometric functions from src/math/trig.c and src/math/lut_trig.c as the original CMock tests, ensuring no regression in test coverage during the migration to Ztest framework. Reference tables and tolerance values are preserved to maintain identical test accuracy and validation criteria.

This is part of the broader SOF unit test migration from CMock to Zephyr Ztest framework, establishing the foundation for math/basic/trigonometry tests in the new directory structure.

[Copilot]

Pull Request Overview

This PR converts 9 existing math trigonometry unit tests from CMock/Unity to Zephyr's Ztest framework, maintaining the same test coverage and functionality while establishing the foundation for math/basic/trigonometry tests in the new SOF Ztest directory structure.

• Conversion of trigonometric function tests (sin, cos, asin, acos) for both 16-bit and 32-bit fixed-point implementations
• Addition of sine lookup table test for 16-bit fixed-point
• Preservation of original reference tables and tolerance values to maintain identical test accuracy

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
test/ztest/unit/math/basic/trigonometry/trig_test.c	Main test file with 9 converted trigonometry tests using Ztest framework
test/ztest/unit/math/basic/trigonometry/trig_tables.h	Reference data tables and tolerance constants for trigonometry tests
test/ztest/unit/math/basic/trigonometry/testcase.yaml	Test configuration file defining test metadata and platform requirements
test/ztest/unit/math/basic/trigonometry/prj.conf	Zephyr project configuration enabling Ztest framework
test/ztest/unit/math/basic/trigonometry/CMakeLists.txt	CMake build configuration linking SOF math libraries and test sources

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[Copilot]

Pull Request Overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 12 comments.

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[lgirdwood]

LGTM, but also needs @singalsu to approve.

[softwarecki]

Nice cleanup! Migrating these tests to Ztest keeps coverage intact and moves us closer to a unified testing framework.