Add GitHub action to run tests using swift-syntax-dev-utils

.github/workflows/pull_request.yml

@@ -27,3 +27,41 @@ jobs:
           persist-credentials: false
       - name: Validate generated code
         run: "./swift-syntax-dev-utils verify-source-code --toolchain /usr"
+  test_using_swift_syntax_dev_utils_linux:
+    name: Run tests using swift-syntax-dev-utils (Linux)
+    runs-on: ubuntu-latest
+    container:
+      image: swift:latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+      - name: Test
+        run: "./swift-syntax-dev-utils test --enable-rawsyntax-validation --enable-test-fuzzing --toolchain /usr"
+  test_using_swift_syntax_dev_utils_windows:
+    name: Run tests using swift-syntax-dev-utils (Windows)
+    runs-on: windows-2022
+    steps:
+      - name: Pull Docker image
+        id: pull_docker_image
+        run: |
+          $Image = "swift:windowsservercore-ltsc2022"
+          docker pull $Image
+          echo "image=$Image" >> "$env:GITHUB_OUTPUT"
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+      - name: Test
+        run: |
+          mkdir $env:TEMP\test-script
+          echo @'
+          Set-PSDebug -Trace 1
+          $SwiftPath = where.exe swift
+          swift.exe run --package-path "C:\Source\SwiftSyntaxDevUtils" swift-syntax-dev-utils test --enable-rawsyntax-validation --enable-test-fuzzing --toolchain "$SwiftPath\..\.."
+          if ($LastExitCode -ne 0) {
+            exit $LastExitCode
+          }
+          '@ >> $env:TEMP\test-script\run.ps1
+          docker run -v ${{ github.workspace }}:C:\source -v $env:TEMP\test-script:C:\test-script ${{ steps.pull_docker_image.outputs.image }} powershell.exe -NoLogo -File C:\test-script\run.ps1

Examples/Package.swift

@@ -13,7 +13,7 @@ let package = Package(
     .executable(name: "CodeGenerationUsingSwiftSyntaxBuilder", targets: ["CodeGenerationUsingSwiftSyntaxBuilder"]),
   ],
   dependencies: [
-    .package(path: "../")
+    .package(name: "swift-syntax", path: "../")
   ],
   targets: [
     .executableTarget(
@@ -39,15 +39,6 @@ let package = Package(
       ],
       path: "Sources/MacroExamples/Implementation"
     ),
-    .testTarget(
-      name: "MacroExamplesImplementationTests",
-      dependencies: [
-        "MacroExamplesImplementation",
-        .product(name: "SwiftSyntaxMacros", package: "swift-syntax"),
-        .product(name: "SwiftSyntaxMacrosTestSupport", package: "swift-syntax"),
-      ],
-      path: "Tests/MacroExamples/Implementation"
-    ),
     .target(
       name: "MacroExamplesInterface",
       dependencies: [
@@ -65,6 +56,25 @@ let package = Package(
   ]
 )
 
+#if !os(Windows)
+// We can't write a test target for macros on Windows because that results in duplicate definitoions of `main`: Once
+// from the macro (which is effectively an executable), and once from the test bundle.
+package.targets.append(
+  .testTarget(
+    name: "MacroExamplesImplementationTests",
+    dependencies: [
+      "MacroExamplesImplementation",
+      .product(name: "SwiftSyntaxMacros", package: "swift-syntax"),
+      .product(name: "SwiftSyntaxMacrosTestSupport", package: "swift-syntax"),
+    ],
+    path: "Tests/MacroExamples/Implementation"
+  )
+)
+#else
+// Add a dummy test target on Windows so that `swift test` invocations from `swift-syntax-dev-utils` don't fail.
+package.targets.append(.testTarget(name: "Dummy", dependencies: []))
+#endif
+
 // This is a fake target that depends on all targets in the package.
 // We need to define it manually because the `Examples-Package` target doesn't exist for `swift build`.
 

Examples/Tests/Dummy/Empty.swift

@@ -0,0 +1,11 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//