[Good First Issue] Add frontend unit tests with Vitest + React Testing Library

[Oshgig]

Overview

The frontend currently has zero tests. We need a basic test suite so external contributors can refactor UI components safely.

Scope

• Set up and in
• Write at least one test per page:
  • — renders without crashing, displays mock run data
  • — renders list of runs, handles empty state
  • — form submission triggers API call
  • — renders alerts with severity filters
• Add script to
• Ensure tests run in CI ( already calls )

Acceptance Criteria

• passes with at least 4 test files
• All tests run in GitHub Actions CI

Resources

• — React app with Vite + Tailwind
• — existing CI workflow

Difficulty: Beginner-friendly
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