diff --git a/Sources/GoogleAI/GenerateContentRequest.swift b/Sources/GoogleAI/GenerateContentRequest.swift
index 4421eb8..fa63f82 100644
--- a/Sources/GoogleAI/GenerateContentRequest.swift
+++ b/Sources/GoogleAI/GenerateContentRequest.swift
@@ -40,9 +40,9 @@ extension GenerateContentRequest: GenerativeAIRequest {
 
   var url: URL {
     if isStreaming {
-      URL(string: "\(GenerativeAISwift.baseURL)/\(model):streamGenerateContent?alt=sse")!
+      return URL(string: "\(GenerativeAISwift.baseURL)/\(model):streamGenerateContent?alt=sse")!
     } else {
-      URL(string: "\(GenerativeAISwift.baseURL)/\(model):generateContent")!
+      return URL(string: "\(GenerativeAISwift.baseURL)/\(model):generateContent")!
     }
   }
 }
diff --git a/Tests/GoogleAITests/ChatTests.swift b/Tests/GoogleAITests/ChatTests.swift
index 4020d4b..668e370 100644
--- a/Tests/GoogleAITests/ChatTests.swift
+++ b/Tests/GoogleAITests/ChatTests.swift
@@ -16,7 +16,7 @@ import Foundation
 @testable import GoogleGenerativeAI
 import XCTest
 
-@available(iOS 15.0, tvOS 15.0, *)
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, *)
 final class ChatTests: XCTestCase {
   var urlSession: URLSession!
 
diff --git a/Tests/GoogleAITests/GenerativeModelTests.swift b/Tests/GoogleAITests/GenerativeModelTests.swift
index 142341b..6a91f52 100644
--- a/Tests/GoogleAITests/GenerativeModelTests.swift
+++ b/Tests/GoogleAITests/GenerativeModelTests.swift
@@ -15,7 +15,7 @@
 @testable import GoogleGenerativeAI
 import XCTest
 
-@available(iOS 15.0, tvOS 15.0, *)
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, *)
 final class GenerativeModelTests: XCTestCase {
   let testPrompt = "What sorts of questions can I ask you?"
   let safetyRatingsNegligible: [SafetyRating] = [
diff --git a/Tests/GoogleAITests/MockURLProtocol.swift b/Tests/GoogleAITests/MockURLProtocol.swift
index 515fd98..30528cd 100644
--- a/Tests/GoogleAITests/MockURLProtocol.swift
+++ b/Tests/GoogleAITests/MockURLProtocol.swift
@@ -15,7 +15,7 @@
 import Foundation
 import XCTest
 
-@available(iOS 15.0, tvOS 15.0, *)
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, *)
 class MockURLProtocol: URLProtocol {
   static var requestHandler: ((URLRequest) throws -> (
     URLResponse,