Switch to staging endpoint

FirebaseVertexAI/Sources/Constants.swift

@@ -17,7 +17,7 @@ import Foundation
 /// Constants associated with the Vertex AI for Firebase SDK.
 enum Constants {
   /// The Vertex AI backend endpoint URL.
-  static let baseURL = "https://firebasevertexai.googleapis.com"
+  static let baseURL = "https://staging-firebasevertexai.sandbox.googleapis.com"
 
   /// The base reverse-DNS name for `NSError` or `CustomNSError` error domains.
   ///

FirebaseVertexAI/Tests/TestApp/Tests/Integration/IntegrationTests.swift

@@ -84,7 +84,7 @@ final class IntegrationTests: XCTestCase {
     XCTAssertNotNil(response.text)
   }
 
-  func testGenerateContent_image_fileData_requiresUserAuth_wrongUser_permissionDenied() async throws {
+  func testGenerateContent_imageData_requiresAuth_wrongUser_permissionDenied() async throws {
     let userID = "3MjEzU6JIobWvHdCYHicnDMcPpQ2"
     let storageRef = storage.reference(withPath: "vertexai/authenticated/user/\(userID)/pink.webp")
 
@@ -144,7 +144,7 @@ final class IntegrationTests: XCTestCase {
     XCTAssertFalse(text.isEmpty)
   }
 
-  func testGenerateContentStream_image_fileData_requiresUserAuth_wrongUser_permissionDenied() async throws {
+  func testGenContentStream_image_fileData_requiresAuth_wrongUser_permissionDenied() async throws {
     let userID = "3MjEzU6JIobWvHdCYHicnDMcPpQ2"
     let storageRef = storage.reference(withPath: "vertexai/authenticated/user/\(userID)/pink.webp")