Run CodeGeneration tests in CI

With the migration of build-script.py to Swift, we accidentally dropped running the CodeGeneration tests. Re-enable them and fix two test failures.

Author: ahoppen

CodeGeneration/Tests/ValidateSyntaxNodes/ValidateSyntaxNodes.swift

@@ -515,6 +515,8 @@ class ValidateSyntaxNodes: XCTestCase {
         ValidationFailure(node: .differentiabilityArguments, message: "could conform to trait 'Parenthesized' but does not"),
         ValidationFailure(node: .editorPlaceholderDecl, message: "could conform to trait 'MissingNode' but does not"),
         ValidationFailure(node: .editorPlaceholderExpr, message: "could conform to trait 'MissingNode' but does not"),
+        ValidationFailure(node: .editorPlaceholderPattern, message: "could conform to trait 'MissingNode' but does not"),
+        ValidationFailure(node: .editorPlaceholderType, message: "could conform to trait 'MissingNode' but does not"),
         ValidationFailure(node: .enumCaseElement, message: "could conform to trait 'NamedDecl' but does not"),
         ValidationFailure(node: .genericParameter, message: "could conform to trait 'NamedDecl' but does not"),
         ValidationFailure(node: .precedenceGroupDecl, message: "could conform to trait 'Braced' but does not"),

SwiftSyntaxDevUtils/Sources/swift-syntax-dev-utils/commands/Test.swift

@@ -24,9 +24,8 @@ struct Test: ParsableCommand, BuildCommand {
   var arguments: BuildArguments
 
   func run() throws {
-    try buildExample(exampleName: "ExamplePlugin")
-
     try runTests()
+    try runCodeGenerationTests()
 
     logSection("All tests passed")
   }
@@ -71,6 +70,30 @@ struct Test: ParsableCommand, BuildCommand {
     )
   }
 
+  private func runCodeGenerationTests() throws {
+    logSection("Running CodeGeneration Tests")
+    var swiftpmCallArguments: [String] = []
+
+    if arguments.verbose {
+      swiftpmCallArguments += ["--verbose"]
+    }
+
+    let additionalEnvironment: [String: String] = [
+      "SWIFT_BUILD_SCRIPT_ENVIRONMENT": "1",
+      "SWIFTSYNTAX_ENABLE_RAWSYNTAX_VALIDATION": "1",
+      "SWIFTPARSER_ENABLE_ALTERNATE_TOKEN_INTROSPECTION": "1",
+    ]
+
+    try invokeSwiftPM(
+      action: "test",
+      packageDir: Paths.codeGenerationDir,
+      additionalArguments: swiftpmCallArguments,
+      additionalEnvironment: additionalEnvironment,
+      captureStdout: false,
+      captureStderr: false
+    )
+  }
+
   private func findSwiftpmBinPath(packageDir: URL) throws -> String {
     return try invokeSwiftPM(
       action: "build",

SwiftSyntaxDevUtils/Sources/swift-syntax-dev-utils/common/BuildCommand.swift

@@ -27,11 +27,6 @@ extension BuildCommand {
     try build(packageDir: packageDir, name: targetName, isProduct: false)
   }
 
-  func buildExample(exampleName: String) throws {
-    logSection("Building example " + exampleName)
-    try build(packageDir: Paths.examplesDir, name: exampleName, isProduct: true)
-  }
-
   @discardableResult
   func invokeSwiftPM(
     action: String,