add unittest coverage html

[yujun4464]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @yujun4464, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances our continuous integration pipeline by introducing automated unit test coverage reporting. The primary goal is to provide immediate visibility into test coverage for every build, including a detailed HTML report and a diff report that focuses on changes relative to the main branch, thereby promoting higher code quality and test discipline.

Highlights

• CI/CD Enhancement: I've integrated new steps into the CircleCI configuration to automatically generate and store unit test coverage reports in HTML format, making it easier to track code quality.
• Coverage Reporting: The pipeline now produces both a full coverage.html report and a coverage_diff.html report, which specifically highlights coverage changes relative to the origin/main branch and enforces a 50% minimum coverage for new or changed code.
• Tooling Integration: To achieve comprehensive coverage analysis, I've added the installation of diff-cover, gocov, and gocov-xml tools directly within the CI environment.

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[gemini-code-assist]

Code Review

This pull request adds a new step to the CircleCI configuration to generate and store code coverage reports, including a diff coverage report. The review suggests pinning dependency versions and using python3-pip for improved reproducibility and clarity.

[yushiqie]

LGTM