chore: internal change

PiperOrigin-RevId: 875298386

Author: sararob

.kokoro/presubmit/node18/system-test.cfg

@@ -5,3 +5,7 @@ env_vars: {
     key: "TRAMPOLINE_BUILD_FILE"
     value: "github/nodejs-vertexai/.kokoro/system-test.sh"
 }
+env_vars: {
+    key: "SECRET_MANAGER_KEYS"
+    value: ""
+}

system_test/end_to_end_sample_test.ts

@@ -134,7 +134,7 @@ const vertexAI = new VertexAI({
   location: LOCATION,
 });
 
-const TEXT_MODEL_NAME = 'gemini-2.0-flash';
+const TEXT_MODEL_NAME = 'gemini-2.5-flash';
 const generativeTextModel = vertexAI.getGenerativeModel({
   model: TEXT_MODEL_NAME,
   generationConfig: {
@@ -148,31 +148,31 @@ const generativeTextModelPreview = vertexAI.preview.getGenerativeModel({
   },
 });
 const generativeTextModelWithPrefix = vertexAI.getGenerativeModel({
-  model: 'models/gemini-2.0-flash',
+  model: 'models/gemini-2.5-flash',
   generationConfig: {
     maxOutputTokens: 256,
   },
 });
 const generativeTextModelWithPrefixPreview =
-  vertexAI.preview.getGenerativeModel({
-    model: 'models/gemini-2.0-flash',
-    generationConfig: {
-      maxOutputTokens: 256,
-    },
-  });
+    vertexAI.preview.getGenerativeModel({
+      model: 'models/gemini-2.5-flash',
+      generationConfig: {
+        maxOutputTokens: 256,
+      },
+    });
 const generativeVisionModel = vertexAI.getGenerativeModel({
-  model: 'gemini-2.0-flash',
+  model: 'gemini-2.5-flash',
 });
 const generativeVisionModelPreview = vertexAI.preview.getGenerativeModel({
-  model: 'gemini-2.0-flash',
+  model: 'gemini-2.5-flash',
 });
 const generativeVisionModelWithPrefix = vertexAI.getGenerativeModel({
-  model: 'gemini-2.0-flash',
+  model: 'gemini-2.5-flash',
 });
 const generativeVisionModelWithPrefixPreview =
-  vertexAI.preview.getGenerativeModel({
-    model: 'models/gemini-2.0-flash',
-  });
+    vertexAI.preview.getGenerativeModel({
+      model: 'models/gemini-2.5-flash',
+    });
 describe('generateContentStream', () => {
   beforeEach(() => {
     jasmine.DEFAULT_TIMEOUT_INTERVAL = 30000;
@@ -972,7 +972,7 @@ describe('sendMessage', () => {
 
 describe('sendMessageStream', () => {
   beforeEach(() => {
-    jasmine.DEFAULT_TIMEOUT_INTERVAL = 30000;
+    jasmine.DEFAULT_TIMEOUT_INTERVAL = 60000;
   });
   it('should should return a stream and populate history when generationConfig is passed to startChat', async () => {
     const chat = generativeTextModel.startChat({