Minimize signins in VertexAI integration tests

Author: paulb777

FirebaseVertexAI/Tests/TestApp/Tests/Integration/GenerateContentIntegrationTests.swift

@@ -43,12 +43,15 @@ struct GenerateContentIntegrationTests {
   let userID1: String
 
   init() async throws {
-    let authResult = try await Auth.auth().signIn(
-      withEmail: Credentials.emailAddress1,
-      password: Credentials.emailPassword1
-    )
-    userID1 = authResult.user.uid
-
+    if let user = Auth.auth().currentUser {
+      userID1 = user.uid
+    } else {
+      let authResult = try await Auth.auth().signIn(
+        withEmail: Credentials.emailAddress1,
+        password: Credentials.emailPassword1
+      )
+      userID1 = authResult.user.uid
+    }
     storage = Storage.storage()
   }
 

FirebaseVertexAI/Tests/TestApp/Tests/Integration/ImagenIntegrationTests.swift

@@ -39,11 +39,15 @@ struct ImagenIntegrationTests {
   var userID1: String
 
   init() async throws {
-    let authResult = try await Auth.auth().signIn(
-      withEmail: Credentials.emailAddress1,
-      password: Credentials.emailPassword1
-    )
-    userID1 = authResult.user.uid
+    if let user = Auth.auth().currentUser {
+      userID1 = user.uid
+    } else {
+      let authResult = try await Auth.auth().signIn(
+        withEmail: Credentials.emailAddress1,
+        password: Credentials.emailPassword1
+      )
+      userID1 = authResult.user.uid
+    }
 
     vertex = VertexAI.vertexAI()
     storage = Storage.storage()

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

@@ -48,11 +48,15 @@ final class IntegrationTests: XCTestCase {
   var userID1 = ""
 
   override func setUp() async throws {
-    let authResult = try await Auth.auth().signIn(
-      withEmail: Credentials.emailAddress1,
-      password: Credentials.emailPassword1
-    )
-    userID1 = authResult.user.uid
+    if let user = Auth.auth().currentUser {
+      userID1 = user.uid
+    } else {
+      let authResult = try await Auth.auth().signIn(
+        withEmail: Credentials.emailAddress1,
+        password: Credentials.emailPassword1
+      )
+      userID1 = authResult.user.uid
+    }
 
     vertex = VertexAI.vertexAI()
     model = vertex.generativeModel(