incremental-test

# Incremental Test Runner for dotnet.Tests ## Prerequisites - A full build must have been completed at least once (via `build.cmd` or `build.sh`) so that the redist SDK layout exists at `artifacts\bin\redist\Debug\dotnet\sdk\<version>\`. - The repo-local `.dotnet` SDK must match the version expected by the test projects. If the runtime or SDK version is out of date (e.g., test build fails with a missing framework error), run `.\restore.cmd` (or `./restore.sh` on macOS/Linux) to download the correct SDK into `.dotnet`. - This workflow uses Windows/PowerShell commands and paths. On macOS/Linux, substitute forward slashes and use `cp` instead of `Copy-Item`. ## Workflow ### Step 1: Identify modified projects Determine which projects have been modified. Use context from: - The files you just edited in this session. - Or `git status`/`git diff` to find changed `.cs` files and map them to their `.csproj` projects. ### Step 2: Build modified projects Build each modified project individually using the repo-local dotnet: ``` .\.dotnet\dotnet build <path-to-project.csproj> -c Debug ``` For example: ``` .\.dotnet\dotnet build src\Cli\Microsoft.DotNet.Cli.Utils\Microsoft.DotNet.Cli.Utils.csproj -c Debug ``` If the `dotnet` CLI project itself was modified, build it: ``` .\.dotnet\dotnet build src\Cli\dotnet\dotnet.csproj -c Debug ``` ### Step 3: Copy output DLLs to the redist SDK layout Discover the SDK version directory name: ```powershell $sdkVersion = (Get-ChildItem artifacts\bin\redist\Debug\dotnet\sdk -Directory | Sort-Object LastWriteTime -Descending | Select-Object -First 1).Name ``` For each modified project, copy its output DLL (and any satellite assemblies) from the project's build output to the redist SDK directory: ``` Source: artifacts\bin\<ProjectName>\Debug\net10.0\<AssemblyName>.dll Target: artifacts\bin\redist\Debug\dotnet\sdk\<version>\ ``` For example: ```powershell Copy-Item artifacts\bin\Microsoft.DotNet.ProjectTools\Debug\net10.0\Microsoft.DotNet.ProjectTools.dll artifacts\bin\redist\Debug\dotnet\sdk\$sdkVersion\ Copy-Item artifacts\bin\Microsoft.DotNet.Cli.Utils\Debug\net10.0\Microsoft.DotNet.Cli.Utils.dll artifacts\bin\redist\Debug\dotnet\sdk\$sdkVersion\ ``` The `dotnet` project is special — it builds into `artifacts\bin\dotnet\Debug\net10.0\` and its `dotnet.dll` must be copied to the SDK directory: ```powershell Copy-Item artifacts\bin\dotnet\Debug\net10.0\dotnet.dll artifacts\bin\redist\Debug\dotnet\sdk\$sdkVersion\ ``` **Important notes:** - For typical incremental edits, only copy DLLs that are **already present** in the target directory. If your change introduces a new shipped assembly or moves assemblies, you will need a full `build.cmd`/`build.sh` to update the layout correctly. - Some projects multi-target (e.g., `net10.0` and `net472`). Always use the `net10.0` output. - If localization resource DLLs were changed (in subdirectories like `cs\`, `de\`, etc.), copy those too. ### Step 4: Run the tests Invoke the [`run-tests`](../run-tests/SKILL.md) skill for `test/dotnet.Tests/dotnet.Tests.csproj` with a filter for the affected tests. It builds the test project incrementally and retains detailed output, a TRX, and a binlog. ## Common project paths | Assembly | Project Path | |---|---| | `dotnet.dll` | `src\Cli\dotnet\dotnet.csproj` | | `Microsoft.DotNet.Cli.Utils.dll` | `src\Cli\Microsoft.DotNet.Cli.Utils\Microsoft.DotNet.Cli.Utils.csproj` | | `Microsoft.DotNet.Cli.Definitions.dll` | `src\Cli\Microsoft.DotNet.Cli.Definitions\Microsoft.DotNet.Cli.Definitions.csproj` | | `Microsoft.DotNet.Cli.CoreUtils.dll` | `src\Cli\Microsoft.DotNet.Cli.CoreUtils\Microsoft.DotNet.Cli.CoreUtils.csproj` | | `Microsoft.DotNet.Configurer.dll` | `src\Cli\Microsoft.DotNet.Configurer\Microsoft.DotNet.Configurer.csproj` | | `Microsoft.DotNet.ProjectTools.dll` | `src\Microsoft.DotNet.ProjectTools\Microsoft.DotNet.ProjectTools.csproj` | | `Microsoft.DotNet.NativeWrapper.dll` | `src\Resolvers\Microsoft.DotNet.NativeWrapper\Microsoft.DotNet.NativeWrapper.csproj` | | `Microsoft.DotNet.TemplateLocator.dll` | `src\Microsoft.DotNet.TemplateLocator\Microsoft.DotNet.TemplateLocator.csproj` | | `Microsoft.DotNet.InternalAbstractions.dll` | `src\Cli\Microsoft.DotNet.InternalAbstractions\Microsoft.DotNet.InternalAbstractions.csproj` | | `dotnet.Tests.dll` | `test\dotnet.Tests\dotnet.Tests.csproj` |