[YashBora21]

What changed

I expanded the test file from #545 to cover all eight badges. Each badge has an earned case and a locked case, including boundary values for the counts and ranks. I also added an npm test script and a Badge Tests workflow for PRs that change the badge code or its test file.

npm test uses node --test because node --test tests/ failed locally by treating the directory as a module. The workflow runs the specific test file on Node 20.

Checks

• npm test: 8 tests passed, 0 failed
• npx prettier --check tests/badges.test.cjs package.json .github/workflows/badge-tests.yml: passed
• git diff --check: passed
• GitHub Actions Badge Tests and Prettier Check: passed

CI result screenshot:

Closes #546

[github-actions]

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