chore: [vertexai]Add integration test for GenerativeModel (#10627)

PiperOrigin-RevId: 619553290

Co-authored-by: Zhenyi Qi <zhenyiqi@google.com>

Author: copybara-service[bot]

java-vertexai/google-cloud-vertexai/src/test/java/com/google/cloud/vertexai/it/ITGenerativeModelIntegrationTest.java

@@ -0,0 +1,92 @@
+/*
+ * Copyright 2024 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.google.cloud.vertexai.it;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.google.cloud.vertexai.VertexAI;
+import com.google.cloud.vertexai.api.CountTokensResponse;
+import com.google.cloud.vertexai.api.GenerateContentResponse;
+import com.google.cloud.vertexai.generativeai.GenerativeModel;
+import com.google.cloud.vertexai.generativeai.ResponseStream;
+import java.io.IOException;
+import java.util.logging.Logger;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+@RunWith(JUnit4.class)
+public class ITGenerativeModelIntegrationTest {
+  private static final String PROJECT_ID = System.getenv("GOOGLE_CLOUD_PROJECT");
+  private static final String MODEL_NAME_TEXT = "gemini-pro";
+  private static final String LOCATION = "us-central1";
+  private static final String TEXT = "What do you think about Google Pixel?";
+  private static final Logger logger =
+      Logger.getLogger(ITGenerativeModelIntegrationTest.class.getName());
+  private VertexAI vertexAi;
+  private GenerativeModel model;
+
+  @Before
+  public void setUp() throws IOException {
+    vertexAi = new VertexAI(PROJECT_ID, LOCATION);
+    model = new GenerativeModel(MODEL_NAME_TEXT, vertexAi);
+  }
+
+  @After
+  public void tearDown() throws IOException {
+    vertexAi.close();
+  }
+
+  @Test
+  public void generateContentStreamWithPlainText() throws IOException {
+    logger.info(String.format("Generating response for question: %s", TEXT));
+
+    ResponseStream<GenerateContentResponse> stream = model.generateContentStream(TEXT);
+
+    logger.info("Print response: ");
+    // GenAI output is flaky so we always print out the response.
+    // For the same reason, we don't do assertions much.
+    for (GenerateContentResponse resp : stream) {
+      logger.info(String.format("Print response:\n%s", resp));
+      assertThat(resp.getCandidatesList()).isNotEmpty();
+    }
+  }
+
+  @Test
+  public void generateContentWithPlainText() throws IOException {
+    logger.info(String.format("Generating response for question: %s", TEXT));
+
+    GenerateContentResponse response = model.generateContent(TEXT);
+
+    logger.info(String.format("Print response:\n%s", response));
+    // GenAI output is flaky so we always print out the response.
+    // For the same reason, we don't do assertions much.
+    assertThat(response.getCandidatesList()).isNotEmpty();
+  }
+
+  @Test
+  public void countTokensWithPlainText() throws IOException {
+    logger.info(String.format("Counting tokens for: %s", TEXT));
+
+    CountTokensResponse tokens = model.countTokens(TEXT);
+    // GenAI output is flaky so we always print out the response.
+    // For the same reason, we don't do assertions much.
+    logger.info(String.format("Print number of tokens:\n%s", tokens));
+    assertThat(tokens.getTotalTokens()).isGreaterThan(0);
+  }
+}