Add a test for macro expansion of @JavaClass/@JavaMethod/@JavaField

Author: DougGregor

Package.swift

@@ -318,6 +318,17 @@ let package = Package(
       ]
     ),
 
+    .testTarget(
+      name: "JavaKitMacroTests",
+      dependencies: [
+        "JavaKitMacros",
+        .product(name: "SwiftSyntaxMacrosTestSupport", package: "swift-syntax"),
+      ],
+      swiftSettings: [
+        .swiftLanguageMode(.v5)
+      ]
+    ),
+    
     .testTarget(
       name: "JExtractSwiftTests",
       dependencies: [

Sources/JavaKitMacros/JavaClassMacro.swift

@@ -17,10 +17,10 @@ import SwiftSyntaxBuilder
 import SwiftSyntaxMacros
 import Foundation // for e.g. replacingOccurrences
 
-enum JavaClassMacro {}
+package enum JavaClassMacro {}
 
 extension JavaClassMacro: MemberMacro {
-  static func expansion(
+  package static func expansion(
     of node: AttributeSyntax,
     providingMembersOf declaration: some DeclGroupSyntax,
     conformingTo protocols: [TypeSyntax],
@@ -99,7 +99,7 @@ extension JavaClassMacro: MemberMacro {
 }
 
 extension JavaClassMacro: ExtensionMacro {
-  static func expansion(
+  package static func expansion(
     of node: AttributeSyntax,
     attachedTo declaration: some DeclGroupSyntax,
     providingExtensionsOf type: some TypeSyntaxProtocol,
@@ -120,7 +120,7 @@ extension JavaClassMacro: ExtensionMacro {
 }
 
 extension JavaClassMacro: PeerMacro {
-  static func expansion(
+  package static func expansion(
     of node: AttributeSyntax,
     providingPeersOf declaration: some DeclSyntaxProtocol,
     in context: some MacroExpansionContext

Sources/JavaKitMacros/JavaFieldMacro.swift

@@ -16,10 +16,10 @@ import SwiftSyntax
 import SwiftSyntaxBuilder
 import SwiftSyntaxMacros
 
-enum JavaFieldMacro {}
+package enum JavaFieldMacro {}
 
 extension JavaFieldMacro: AccessorMacro {
-  static func expansion(
+  package static func expansion(
     of node: AttributeSyntax,
     providingAccessorsOf declaration: some DeclSyntaxProtocol,
     in context: some MacroExpansionContext

Sources/JavaKitMacros/JavaMethodMacro.swift

@@ -17,10 +17,10 @@ import SwiftSyntaxBuilder
 @_spi(Testing) import SwiftSyntaxMacroExpansion
 import SwiftSyntaxMacros
 
-enum JavaMethodMacro {}
+package enum JavaMethodMacro {}
 
 extension JavaMethodMacro: BodyMacro {
-  static func expansion(
+  package static func expansion(
     of node: AttributeSyntax,
     providingBodyFor declaration: some DeclSyntaxProtocol & WithOptionalCodeBlockSyntax,
     in context: some MacroExpansionContext

Tests/JavaKitMacroTests/JavaClassMacroTests.swift

@@ -0,0 +1,87 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2024 Apple Inc. and the Swift.org project authors
+// Licensed under Apache License v2.0
+//
+// See LICENSE.txt for license information
+// See CONTRIBUTORS.txt for the list of Swift.org project authors
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+//===----------------------------------------------------------------------===//
+
+import JavaKitMacros
+import SwiftSyntax
+import SwiftSyntaxBuilder
+import SwiftSyntaxMacros
+import SwiftSyntaxMacrosTestSupport
+import XCTest
+
+class JavaKitMacroTests: XCTestCase {
+  static let javaKitMacros: [String: any Macro.Type] = [
+    "JavaClass": JavaClassMacro.self,
+    "JavaMethod": JavaMethodMacro.self,
+    "JavaField": JavaFieldMacro.self
+  ]
+
+  func testJavaClass() throws {
+    assertMacroExpansion("""
+        @JavaClass("org.swift.example.HelloWorld")
+        public struct HelloWorld {
+          @JavaMethod
+          public init(_ value: Int32, environment: JNIEnvironment) 
+
+          @JavaMethod
+          public func isBigEnough(_: Int32) -> Bool
+
+          @JavaField
+          public var myField: Int64
+        }
+      """,
+      expandedSource: """
+
+        public struct HelloWorld {
+          public init(_ value: Int32, environment: JNIEnvironment)  {
+              self = try! Self.dynamicJavaNewObject(in: environment, arguments: value.self)
+          }
+          public func isBigEnough(_: Int32) -> Bool {
+              return try! dynamicJavaMethodCall(methodName: "isBigEnough", resultType: Bool.self)
+          }
+          public var myField: Int64 {
+              get {
+                  self[javaFieldName: "myField", fieldType: Int64.self]
+              }
+              nonmutating set {
+                  self[javaFieldName: "myField", fieldType: Int64.self] = newValue
+              }
+          }
+      
+            /// The full Java class name for this Swift type.
+            public static var fullJavaClassName: String {
+                "org.swift.example.HelloWorld"
+            }
+
+            public typealias JavaSuperclass = JavaObject
+
+            public var javaHolder: JavaObjectHolder
+
+            public var javaThis: jobject {
+              javaHolder.object!
+            }
+
+            public var javaEnvironment: JNIEnvironment {
+              javaHolder.environment
+            }
+
+            public init(javaHolder: JavaObjectHolder) {
+                self.javaHolder = javaHolder
+            }
+        }
+      """,
+      macros: Self.javaKitMacros
+    )
+  }
+}
+