... .testTarget( name: "PowerAssertTests", dependencies: [ "PowerAssertPlugin", "PowerAssert", .product(name: "SwiftSyntaxMacrosTestSupport", package: "swift-syntax"), ] ), テストの依存関係はこういうふうに構成しますね。テスト対象はPowerAssertモジュール。... .testTarget( name: "PowerAssertTests", dependencies: [ "PowerAssertPlugin", "PowerAssert", .product(name: "SwiftSyntaxMacrosTestSupport", package: "swift-syntax"), ] ), テストの依存関係はこういうふうに構成しますね。テスト対象はPowerAssertモジュール。