[VertexAI] Add Swift 6 testing to CI (#14503)

Author: paulb777

.github/workflows/vertexai.yml

@@ -128,15 +128,20 @@ jobs:
     if: (github.repository == 'Firebase/firebase-ios-sdk' && github.event_name == 'schedule') || github.event_name == 'pull_request'
     strategy:
       matrix:
-        target: [ios]
-        os: [macos-14, macos-15]
         include:
           - os: macos-14
             xcode: Xcode_15.2
+            swift_version: 5.9
             warnings: --allow-warnings
           - os: macos-15
             xcode: Xcode_16.2
+            swift_version: 5.9
             warnings:
+          #TODO: Fix remaining warning in GenerativeAIService and remove --allow-warnings.
+          - os: macos-15
+            xcode: Xcode_16.2
+            swift_version: 6.0
+            warnings: --allow-warnings
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v4
@@ -147,6 +152,8 @@ jobs:
       run: scripts/setup_bundler.sh
     - name: Xcode
       run: sudo xcode-select -s /Applications/${{ matrix.xcode }}.app/Contents/Developer
+    - name: Set Swift swift_version
+      run: sed -i "" "s#s.swift_version = '5.9'#s.swift_version = '${{ matrix.swift_version}}'#" FirebaseVertexAI.podspec
     - name: Build and test
       run: scripts/third_party/travis/retry.sh scripts/pod_lib_lint.rb FirebaseVertexAI.podspec --platforms=${{ matrix.target }} ${{ matrix.warnings }}
 

FirebaseVertexAI/CHANGELOG.md

@@ -1,3 +1,6 @@
+# Unreleased
+- [feature] The Firebase Vertex AI SDK no longer requires `@preconcurrency` when imported in Swift 6.
+
 # 11.9.0
 - [feature] **Public Preview**: Added support for generating images using the
   Imagen 3 model.

FirebaseVertexAI/Tests/Unit/MockURLProtocol.swift

@@ -16,12 +16,18 @@ import Foundation
 import XCTest
 
 @available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
-class MockURLProtocol: URLProtocol {
-  static var requestHandler: ((URLRequest) throws -> (
-    URLResponse,
-    AsyncLineSequence<URL.AsyncBytes>?
-  ))?
-
+class MockURLProtocol: URLProtocol, @unchecked Sendable {
+  #if compiler(>=6)
+    nonisolated(unsafe) static var requestHandler: ((URLRequest) throws -> (
+      URLResponse,
+      AsyncLineSequence<URL.AsyncBytes>?
+    ))?
+  #else
+    static var requestHandler: ((URLRequest) throws -> (
+      URLResponse,
+      AsyncLineSequence<URL.AsyncBytes>?
+    ))?
+  #endif
   override class func canInit(with request: URLRequest) -> Bool {
     #if os(watchOS)
       print("MockURLProtocol cannot be used on watchOS.")

FirebaseVertexAI/Tests/Unit/VertexComponentTests.swift

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-import FirebaseCore
+@preconcurrency import FirebaseCore
 import Foundation
 import XCTest