Add unit tests with CI/CD automation and comprehensive test reporting

[Copilot]

Purpose

Addresses feedback on PR #21: implements automated test execution, generates detailed test reports, and establishes CI/CD testing infrastructure.

• Runs and validates 10 XUnit tests covering HTTP trigger functions (100% pass rate)
• Generates comprehensive test report with coverage analysis and execution metrics
• Establishes GitHub Actions CI workflow for automated test execution on push/PR
• Documents testing methodology and usage in README

Does this introduce a breaking change?

[ ] Yes
[x] No

Pull Request Type

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

• Get the code

git clone https://github.com/Azure-Samples/functions-quickstart-dotnet-azd.git
cd functions-quickstart-dotnet-azd
git checkout copilot/continue-working-on-pr-comments

• Test the code

dotnet build http.sln
dotnet test http.sln

What to Check

Verify that the following are valid

• All 10 unit tests pass (4 for httpGetFunction, 6 for HttpPostBody)
• test-report.md contains execution results and coverage analysis
• CI workflow (.github/workflows/test.yml) validates on push
• README Testing section documents test usage

Other Information

Test Coverage:

• httpGetFunction: Name parameter handling (valid/empty/null), logging validation
• HttpPostBody: Valid data, validation failures (empty/null name, zero age), error logging

CI Workflow:

• Automatic execution on push/PR to main
• Test result and coverage artifacts with 30-day retention
• Minimal security permissions (contents: read, actions: read, checks: write)

Files Added:

• .github/workflows/test.yml - CI test automation
• test-report.md - Detailed test results and recommendations
• test-specification.md - Test methodology (from PR Add unit tests for HTTP trigger functions #21)
• http.Tests/ - XUnit test project (from PR Add unit tests for HTTP trigger functions #21)

Original prompt

continue working on this PR based on my comments

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