NET-12: Add .NET 6 testing framework for HomeController migration

.gitignore

@@ -163,3 +163,10 @@ SampleWebApp/Properties/PublishProfiles/samplemvcwebapp - Web Deploy.pubxml
 SampleWebApp/Properties/PublishProfiles/samplemvcwebapp.net - WebWiz.pubxml
 git/.gitattributes
 git/.gitignore
+
+# Coverage reports
+coverage.cobertura.xml
+coverage.*.xml
+TestResults/
+# BenchmarkDotNet artifacts
+BenchmarkDotNet.Artifacts/

netcore/README.md

@@ -0,0 +1,34 @@
+# SampleWebApp — .NET 6 migration (NET-1 / NET-12)
+
+This directory contains the **.NET 6** port of `SampleMvcWebApp` and its
+testing / quality-assurance infrastructure. It exists alongside the original
+MVC5 / .NET Framework 4.5.1 solution at the repository root so the two can
+evolve independently during the phased migration.
+
+## Projects
+
+| Project                                          | Purpose                                            |
+|--------------------------------------------------|----------------------------------------------------|
+| `src/SampleWebApp`                               | Migrated ASP.NET Core 6 MVC web app                |
+| `tests/SampleWebApp.UnitTests`                   | xUnit unit tests (controller + model)              |
+| `tests/SampleWebApp.IntegrationTests`            | HTTP-level endpoint tests via `TestServer`         |
+| `tests/SampleWebApp.PerformanceTests`            | BenchmarkDotNet micro-benchmarks                   |
+
+Solution file: `SampleWebApp.NetCore.sln`.
+
+## Prerequisites
+
+- [.NET 6 SDK](https://dotnet.microsoft.com/download/dotnet/6.0)
+
+## Quick start
+
+```bash
+dotnet build netcore/SampleWebApp.NetCore.sln -c Release
+dotnet test  netcore/tests/SampleWebApp.UnitTests/SampleWebApp.UnitTests.csproj -c Release
+dotnet test  netcore/tests/SampleWebApp.IntegrationTests/SampleWebApp.IntegrationTests.csproj -c Release
+dotnet run  --project netcore/src/SampleWebApp -c Release
+```
+
+See [`docs/testing.md`](./docs/testing.md) for the full testing guide and
+[`docs/test-results.md`](./docs/test-results.md) for the baseline results
+captured when the framework was established.

netcore/SampleWebApp.NetCore.sln

@@ -0,0 +1,50 @@
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+EndProject
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netcore/coverlet.runsettings

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Coverage configuration for `dotnet test --collect:"XPlat Code Coverage"`.
+  Program.cs is the ASP.NET bootstrap (DI wiring) and cshtml Razor views are
+  compiled views; neither is meaningfully unit-testable, so both are excluded.
+-->
+<RunSettings>
+  <DataCollectionRunSettings>
+    <DataCollectors>
+      <DataCollector friendlyName="XPlat code coverage">
+        <Configuration>
+          <Format>cobertura</Format>
+          <Include>[SampleWebApp]*</Include>
+          <ExcludeByFile>**/Program.cs,**/*.cshtml,**/obj/**/*.cs</ExcludeByFile>
+        </Configuration>
+      </DataCollector>
+    </DataCollectors>
+  </DataCollectionRunSettings>
+</RunSettings>

netcore/docs/test-results.md

@@ -0,0 +1,76 @@
+# Test Results — NET-12
+
+Baseline results captured while setting up the testing framework for the
+.NET 6 migration. Reproduce with the commands in [`testing.md`](./testing.md).
+
+## Unit tests (`SampleWebApp.UnitTests`)
+
+- **13 / 13 tests passing**
+- Duration: ~1.2 s
+- Framework: xUnit 2.4 on .NET 6.0
+
+Breakdown:
+
+| Suite                              | Tests |
+|------------------------------------|-------|
+| `HomeControllerTests`              | 6     |
+| `InternalsInfoTests`               | 3     |
+| `InternalsInfoProviderTests`       | 4     |
+
+## Coverage
+
+Collected with Coverlet (msbuild integration), excluding `Program.cs` and
+`*.cshtml` views per the project's `coverlet.runsettings`.
+
+| Module        | Line | Branch | Method |
+|---------------|------|--------|--------|
+| `SampleWebApp`| 100% | 100%   | 100%   |
+
+Per-file highlights:
+
+| File                                  | Line rate |
+|---------------------------------------|-----------|
+| `Controllers/HomeController.cs`       | 100%      |
+| `Models/InternalsInfo.cs`             | 100%      |
+
+Exceeds the NET-12 acceptance criterion of **>90% coverage** on
+`HomeController`.
+
+## Integration tests (`SampleWebApp.IntegrationTests`)
+
+- **10 / 10 tests passing**
+- Duration: ~1.5 s
+- Host: `Microsoft.AspNetCore.Mvc.Testing` `WebApplicationFactory<Program>`
+
+All `HomeController` endpoints (`/`, `/Home`, `/Home/Index`, `/Home/About`,
+`/Home/Contact`, `/Home/Internals`, `/Home/CodeView`) return `200 OK` with
+`Content-Type: text/html` and non-empty bodies. Content assertions cover the
+About page description message and the Internals page runtime metrics block.
+`/Home/DoesNotExist` correctly returns `404 Not Found`.
+
+## Performance benchmarks (`SampleWebApp.PerformanceTests`)
+
+The benchmark project ships with `HomeControllerBenchmarks` (one benchmark per
+action method, `Index` as the `Baseline`) and `InternalsInfoBenchmarks`.
+BenchmarkDotNet discovers all 6 benchmarks:
+
+```
+SampleWebApp.PerformanceTests.HomeControllerBenchmarks.Index
+SampleWebApp.PerformanceTests.HomeControllerBenchmarks.About
+SampleWebApp.PerformanceTests.HomeControllerBenchmarks.Contact
+SampleWebApp.PerformanceTests.HomeControllerBenchmarks.Internals
+SampleWebApp.PerformanceTests.HomeControllerBenchmarks.CodeView
+SampleWebApp.PerformanceTests.InternalsInfoBenchmarks.CreateInternalsInfo
+```
+
+Full benchmark runs are intentionally not part of CI (they take minutes and
+are sensitive to the host machine). They are intended as a nightly /
+on-demand comparison harness: once the legacy MVC5 controller is retired,
+the numbers produced here become the official baseline used when reviewing
+future performance-sensitive PRs.
+
+Sanity-check invocation (fast, just enumerates the benchmarks):
+
+```bash
+dotnet run --project netcore/tests/SampleWebApp.PerformanceTests -c Release -- --list flat
+```

netcore/docs/testing.md

@@ -0,0 +1,124 @@
+# Testing Framework & Quality Assurance (.NET 6 migration)
+
+This document describes the testing framework put in place for the
+`SampleWebApp` **.NET 6 migration** (see JIRA `NET-12`). The framework lives
+entirely under `netcore/` and is independent of the legacy MVC5 `Tests` project
+so both can coexist during the migration.
+
+## Layout
+
+```
+netcore/
+├── SampleWebApp.NetCore.sln
+├── coverlet.runsettings
+├── src/
+│   └── SampleWebApp/                    # Migrated ASP.NET Core 6 MVC app
+├── tests/
+│   ├── SampleWebApp.UnitTests/          # xUnit + Moq + FluentAssertions
+│   ├── SampleWebApp.IntegrationTests/   # WebApplicationFactory<Program>
+│   └── SampleWebApp.PerformanceTests/   # BenchmarkDotNet benchmarks
+└── docs/
+    └── testing.md                       # This file
+```
+
+## Stack
+
+| Concern               | Tool                                                    |
+|-----------------------|---------------------------------------------------------|
+| Test runner           | [xUnit](https://xunit.net/) 2.4                         |
+| Mocking               | [Moq](https://github.com/moq/moq) 4.18                  |
+| Assertions            | [FluentAssertions](https://fluentassertions.com/) 6.12  |
+| Web host for tests    | `Microsoft.AspNetCore.Mvc.Testing` 6.0                  |
+| Code coverage         | [Coverlet](https://github.com/coverlet-coverage/coverlet) 3.1 |
+| Performance / bench   | [BenchmarkDotNet](https://benchmarkdotnet.org/) 0.13    |
+
+## Running the tests
+
+From the repository root:
+
+```bash
+# Restore & build everything
+dotnet build netcore/SampleWebApp.NetCore.sln -c Release
+
+# Run unit tests with coverage (Cobertura report at tests/SampleWebApp.UnitTests/coverage.cobertura.xml)
+dotnet test netcore/tests/SampleWebApp.UnitTests/SampleWebApp.UnitTests.csproj \
+    -c Release \
+    /p:CollectCoverage=true \
+    /p:CoverletOutputFormat=cobertura \
+    '/p:Include="[SampleWebApp]*"' \
+    '/p:ExcludeByFile="**/Program.cs,**/*.cshtml,**/obj/**/*.cs"'
+
+# Run integration tests (boots the app in-process)
+dotnet test netcore/tests/SampleWebApp.IntegrationTests/SampleWebApp.IntegrationTests.csproj -c Release
+
+# Run performance benchmarks
+dotnet run --project netcore/tests/SampleWebApp.PerformanceTests -c Release
+```
+
+Alternatively, use the runsettings file for `dotnet test --collect:"XPlat Code Coverage"`:
+
+```bash
+dotnet test netcore/SampleWebApp.NetCore.sln \
+    --collect:"XPlat Code Coverage" \
+    --settings netcore/coverlet.runsettings
+```
+
+## What is covered
+
+### Unit tests — `SampleWebApp.UnitTests`
+
+`HomeControllerTests`:
+
+- Constructor argument validation (null provider throws)
+- `Index`, `Contact`, `CodeView` return the default `ViewResult`
+- `About` sets `ViewBag.Message` to the expected string
+- `Internals` resolves an `InternalsInfo` model from the injected
+  `IInternalsInfoProvider` and surfaces every metric onto the view
+
+`InternalsInfoTests` / `InternalsInfoProviderTests`:
+
+- Constructor argument validation
+- All four counter properties are populated from the provider
+- The default (parameterless) constructor exercises the real provider
+- Each concrete provider method returns sane, runtime-independent values
+
+### Integration tests — `SampleWebApp.IntegrationTests`
+
+`HomeControllerEndpointTests` uses `WebApplicationFactory<Program>` to boot
+the real app in-process and hits every endpoint over HTTP:
+
+- `GET /`, `/Home`, `/Home/Index`, `/Home/About`, `/Home/Contact`,
+  `/Home/Internals`, `/Home/CodeView` — each returns `200 OK` and `text/html`
+- `GET /Home/About` contains the description message rendered from the view
+- `GET /Home/Internals` contains all four runtime-metric labels
+- `GET /Home/DoesNotExist` returns `404 Not Found`
+
+### Performance benchmarks — `SampleWebApp.PerformanceTests`
+
+`HomeControllerBenchmarks` measures every action method in isolation
+(`Index` as the `Baseline`). `InternalsInfoBenchmarks` measures the per-call
+cost of assembling an `InternalsInfo` snapshot. Benchmarks run with
+`[MemoryDiagnoser]` enabled so allocations are reported alongside timings.
+
+## Coverage expectations
+
+The acceptance criteria for `NET-12` require **&gt;90% coverage on
+`HomeController`**. The current suite achieves **100% line, branch, and method
+coverage** on both `Controllers/HomeController.cs` and `Models/InternalsInfo.cs`.
+
+`Program.cs` (the ASP.NET Core bootstrap / DI wiring) and all Razor
+`.cshtml` views are excluded from coverage measurement since they are exercised
+by the integration tests rather than unit tests.
+
+## CI integration
+
+The `dotnet test` commands above emit a `coverage.cobertura.xml` report that
+can be consumed by any CI coverage tool (Codecov, Coveralls, Azure Pipelines,
+ReportGenerator, etc.). A suggested CI pipeline looks like:
+
+1. `dotnet restore netcore/SampleWebApp.NetCore.sln`
+2. `dotnet build netcore/SampleWebApp.NetCore.sln -c Release --no-restore`
+3. `dotnet test` for the unit + integration projects with coverage collection
+4. Fail the build if the `HomeController` line-rate drops below 0.9
+5. (Optional) run the benchmark project as a nightly job and archive the
+   BenchmarkDotNet artifacts to track perf regressions across commits.

netcore/src/SampleWebApp/Controllers/HomeController.cs

@@ -0,0 +1,33 @@
+using Microsoft.AspNetCore.Mvc;
+using SampleWebApp.Models;
+
+namespace SampleWebApp.Controllers;
+
+/// <summary>
+/// .NET 6 migration of the original MVC5 <c>HomeController</c>. Action
+/// signatures and view names are preserved so existing routes continue to work.
+/// </summary>
+public class HomeController : Controller
+{
+    private readonly IInternalsInfoProvider _internalsInfoProvider;
+
+    public HomeController(IInternalsInfoProvider internalsInfoProvider)
+    {
+        _internalsInfoProvider = internalsInfoProvider
+            ?? throw new ArgumentNullException(nameof(internalsInfoProvider));
+    }
+
+    public IActionResult Index() => View();
+
+    public IActionResult About()
+    {
+        ViewBag.Message = "Your application description page.";
+        return View();
+    }
+
+    public IActionResult Contact() => View();
+
+    public IActionResult Internals() => View(new InternalsInfo(_internalsInfoProvider));
+
+    public IActionResult CodeView() => View();
+}