test: update setup logic

Author: russellwheatley

samples/swiftui/FirebaseSwiftUIExample/FirebaseSwiftUIExampleTests/FirebaseSwiftUIExampleTests.swift

@@ -15,12 +15,14 @@ let kPassword = "123456"
 
 struct FirebaseSwiftUIExampleTests {
   @MainActor
-  func prepareFreshAuthService() async throws -> AuthService {
+  func prepareFreshAuthService(configuration: AuthConfiguration? = nil) async throws
+    -> AuthService {
     configureFirebaseIfNeeded()
     try await clearAuthEmulatorState()
 
-    let auth = Auth.auth()
-    return AuthService(auth: auth)
+    let resolvedConfiguration = configuration ?? AuthConfiguration()
+
+    return AuthService(configuration: resolvedConfiguration)
   }
 
   @Test

samples/swiftui/FirebaseSwiftUIExample/FirebaseSwiftUIExampleTests/TestHarness.swift

@@ -15,7 +15,6 @@ func configureFirebaseIfNeeded() {
   if FirebaseApp.app() == nil {
     FirebaseApp.configure()
   }
-  Auth.auth().useEmulator(withHost: "localhost", port: 9099)
 }
 
 private var hasCheckedEmulatorAvailability = false
@@ -42,6 +41,7 @@ func isEmulatorRunning() async throws {
       ]
     )
   }
+  Auth.auth().useEmulator(withHost: "localhost", port: 9099)
   hasCheckedEmulatorAvailability = true
 }