tests.dotnet: init with test for projectReferences

Add a test for buildDotnetModule's `projectReferences = [ ... ];`
feature, which is currently unused and therefore untested in nixpkgs.

pkgs/test/default.nix

@@ -86,6 +86,8 @@ with pkgs;
 
   coq = callPackage ./coq {};
 
+  dotnet = recurseIntoAttrs (callPackages ./dotnet { });
+
   makeHardcodeGsettingsPatch = callPackage ./make-hardcode-gsettings-patch { };
 
   makeWrapper = callPackage ./make-wrapper { };

pkgs/test/dotnet/default.nix

@@ -0,0 +1,5 @@
+{ callPackage }:
+
+{
+  project-references = callPackage ./project-references { };
+}

pkgs/test/dotnet/project-references/application/Application.cs

@@ -0,0 +1 @@
+ProjectReferencesTest.Library.Hello();

pkgs/test/dotnet/project-references/application/Application.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+    <PropertyGroup>
+        <OutputType>exe</OutputType>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <ProjectReference Include="../library/Library.csproj" />
+        <PackageReference Include="ProjectReferencesTest.Library" Version="*" Condition=" '$(ContinuousIntegrationBuild)'=='true' " />
+    </ItemGroup>
+</Project>

pkgs/test/dotnet/project-references/default.nix

@@ -0,0 +1,38 @@
+# Tests the `projectReferences = [ ... ];` feature of buildDotnetModule.
+# The `library` derivation exposes a .nupkg, which is then consumed by the `application` derivation.
+# https://nixos.org/manual/nixpkgs/unstable/index.html#packaging-a-dotnet-application
+
+{ lib
+, dotnet-sdk
+, buildDotnetModule
+, runCommand
+}:
+
+let
+  nugetDeps = ./nuget-deps.nix;
+
+  # Specify the TargetFramework via an environment variable so that we don't
+  # have to update the .csproj files when updating dotnet-sdk
+  TargetFramework = "net${lib.versions.majorMinor (lib.getVersion dotnet-sdk)}";
+
+  library = buildDotnetModule {
+    name = "project-references-test-library";
+    src = ./library;
+    inherit nugetDeps TargetFramework;
+
+    packNupkg = true;
+  };
+
+  application = buildDotnetModule {
+    name = "project-references-test-application";
+    src = ./application;
+    inherit nugetDeps TargetFramework;
+
+    projectReferences = [ library ];
+  };
+in
+
+runCommand "project-references-test" { } ''
+  ${application}/bin/Application
+  touch $out
+''

pkgs/test/dotnet/project-references/library/Library.cs

@@ -0,0 +1,8 @@
+namespace ProjectReferencesTest;
+public static class Library
+{
+    public static void Hello()
+    {
+        System.Console.WriteLine("Hello, World!");
+    }
+}

pkgs/test/dotnet/project-references/library/Library.csproj

@@ -0,0 +1,5 @@
+<Project Sdk="Microsoft.NET.Sdk">
+    <PropertyGroup>
+        <PackageId>ProjectReferencesTest.Library</PackageId>
+    </PropertyGroup>
+</Project>

pkgs/test/dotnet/project-references/nuget-deps.nix

@@ -0,0 +1,5 @@
+# This file was automatically generated by passthru.fetch-deps.
+# Please dont edit it manually, your changes might get overwritten!
+
+{ fetchNuGet }: [
+]