dotnet: add publish and web tests

This adds a helper for creating dotnet tests, and adds tests for:

- normal publish and run via wrapper
- aspnetcore web app

pkgs/development/compilers/dotnet/common.nix

@@ -4,6 +4,8 @@
 , writeText
 , testers
 , runCommand
+, expect
+, curl
 }: type: args: stdenv.mkDerivation (finalAttrs: args // {
   doInstallCheck = true;
 
@@ -27,37 +29,97 @@
 
 } // lib.optionalAttrs (type == "sdk") {
   passthru = {
-    tests = {
+    tests = let
+      mkDotnetTest =
+        {
+          name,
+          template,
+          usePackageSource ? false,
+          build,
+          # TODO: use correct runtimes instead of sdk
+          runtime ? finalAttrs.finalPackage,
+          runInputs ? [],
+          run ? null,
+        }:
+        let
+          built = runCommand "dotnet-test-${name}" { buildInputs = [ finalAttrs.finalPackage ]; } (''
+            HOME=$PWD/.home
+            dotnet new nugetconfig
+            dotnet nuget disable source nuget
+          '' + lib.optionalString usePackageSource ''
+            dotnet nuget add source ${finalAttrs.finalPackage.packages}
+          '' + ''
+            dotnet new ${template} -n test -o .
+          '' + build);
+        in
+          if run == null
+            then build
+          else
+            runCommand "${built.name}-run" { src = built; nativeBuildInputs = runInputs; } (
+              lib.optionalString (runtime != null) ''
+                # TODO: use runtime here
+                export DOTNET_ROOT=${runtime}
+              '' + run);
+
+      checkConsoleOutput = command: ''
+        output="$(${command})"
+        # yes, older SDKs omit the comma
+        [[ "$output" =~ Hello,?\ World! ]] && touch "$out"
+      '';
+
+    in {
       version = testers.testVersion {
         package = finalAttrs.finalPackage;
       };
 
-      console = runCommand "dotnet-test-console" {
-        nativeBuildInputs = [ finalAttrs.finalPackage ];
-      } ''
-        HOME=$(pwd)/fake-home
-        dotnet new nugetconfig
-        dotnet nuget disable source nuget
-        dotnet new console -n test -o .
-        output="$(dotnet run)"
-        # yes, older SDKs omit the comma
-        [[ "$output" =~ Hello,?\ World! ]] && touch "$out"
-      '';
+      console = mkDotnetTest {
+        name = "console";
+        template = "console";
+        build = checkConsoleOutput "dotnet run";
+      };
 
-      single-file = let build = runCommand "dotnet-test-build-single-file" {
-        nativeBuildInputs = [ finalAttrs.finalPackage ];
-      } ''
-        HOME=$(pwd)/fake-home
-        dotnet new nugetconfig
-        dotnet nuget disable source nuget
-        dotnet nuget add source ${finalAttrs.finalPackage.packages}
-        dotnet new console -n test -o .
-        dotnet publish --use-current-runtime -p:PublishSingleFile=true -o $out
-      ''; in runCommand "dotnet-test-run-single-file" {} ''
-        output="$(${build}/test)"
-        # yes, older SDKs omit the comma
-        [[ "$output" =~ Hello,?\ World! ]] && touch "$out"
-      '';
+      publish = mkDotnetTest {
+        name = "publish";
+        template = "console";
+        build = "dotnet publish -o $out";
+        run = checkConsoleOutput "$src/test";
+      };
+
+      single-file = mkDotnetTest {
+        name = "single-file";
+        template = "console";
+        usePackageSource = true;
+        build = "dotnet publish --use-current-runtime -p:PublishSingleFile=true -o $out";
+        runtime = null;
+        run = checkConsoleOutput "$src/test";
+      };
+
+      web = mkDotnetTest {
+        name = "publish";
+        template = "web";
+        build = "dotnet publish -o $out";
+        runInputs = [ expect curl ];
+        run = ''
+          expect <<"EOF"
+            set status 1
+            spawn $env(src)/test
+            expect_before default abort
+            expect -re {Now listening on: ([^\r]+)\r} {
+              set url $expect_out(1,string)
+            }
+            expect "Application started. Press Ctrl+C to shut down."
+            set output [exec curl -sSf $url]
+            if {$output != "Hello World!"} {
+              send_error "Unexpected output: $output\n"
+              exit 1
+            }
+            send \x03
+            catch wait result
+            exit [lindex $result 3]
+          EOF
+          touch $out
+        '';
+      };
     } // args.passthru.tests or {};
   } // args.passthru or {};
 })