feat(google-genai): Check Google Generative AI Structured Output (#7293)

Co-authored-by: Keerthiha <keerthiha.baskaran@mail.utoronto.ca>
Co-authored-by: jacoblee93 <jacoblee93@gmail.com>

libs/langchain-google-genai/src/tests/chat_models-extended.int.test.ts

@@ -0,0 +1,141 @@
+/* eslint-disable no-process-env */
+import { test, expect } from "@jest/globals";
+import { z } from "zod";
+import { ChatGoogleGenerativeAI } from "../chat_models.js";
+
+const baseSchema = z.object({
+  name: z.string(),
+  age: z.number(),
+});
+
+test("Google AI - Generate structured output without errors", async () => {
+  const model = new ChatGoogleGenerativeAI({
+    model: "gemini-1.5-flash",
+    temperature: 0.7,
+  });
+  const structuredLlm = model.withStructuredOutput(baseSchema);
+  const request = "Generate a structured response for a user.";
+  const result = await structuredLlm.invoke(request);
+  console.log("Valid Schema Result:", result);
+  expect(result).toBeDefined();
+  expect(result).toHaveProperty("name");
+  expect(result).toHaveProperty("age");
+});
+
+test("Google AI - Validate nested schema structures", async () => {
+  const schema = z.object({
+    name: z.string(),
+    details: z.object({
+      age: z.number(),
+      address: z.string(),
+    }),
+  });
+  const model = new ChatGoogleGenerativeAI({
+    model: "gemini-1.5-flash",
+    temperature: 0.7,
+  });
+  const structuredLlm = model.withStructuredOutput(schema);
+  const request = "Generate structured data with nested schema.";
+  const result = await structuredLlm.invoke(request);
+  console.log("Nested Schema Result:", result);
+  expect(result).toBeDefined();
+  expect(result.details).toHaveProperty("age");
+  expect(result.details).toHaveProperty("address");
+});
+
+test("Google AI - Handle optional fields in schema", async () => {
+  const schema = z.object({
+    name: z.string(),
+    age: z.number(),
+    email: z.string().optional(),
+  });
+  const model = new ChatGoogleGenerativeAI({
+    model: "gemini-1.5-flash",
+    temperature: 0.7,
+  });
+  const structuredLlm = model.withStructuredOutput(schema);
+  const request = "Generate structured data with optional fields.";
+  const result = await structuredLlm.invoke(request);
+  console.log("Optional Fields Result:", result);
+  expect(result).toBeDefined();
+  expect(result).toHaveProperty("name");
+  expect(result).toHaveProperty("age");
+  expect(result).toHaveProperty("email");
+});
+
+test("Google AI - Validate schema with large payloads", async () => {
+  const schema = z.object({
+    name: z.string(),
+    age: z.number(),
+    address: z.string(),
+    phone: z.string(),
+    email: z.string(),
+  });
+  const model = new ChatGoogleGenerativeAI({
+    model: "gemini-1.5-flash",
+    temperature: 0.7,
+  });
+  const structuredLlm = model.withStructuredOutput(schema);
+  const request = "Generate structured data for a user with many fields.";
+  const result = await structuredLlm.invoke(request);
+  console.log("Large Payload Result:", result);
+  expect(result).toBeDefined();
+  expect(result).toHaveProperty("name");
+  expect(result).toHaveProperty("age");
+  expect(result).toHaveProperty("address");
+  expect(result).toHaveProperty("phone");
+  expect(result).toHaveProperty("email");
+});
+
+test("Google AI - Handle schema with deeply nested structures", async () => {
+  const schema = z.object({
+    user: z.object({
+      id: z.string(),
+      profile: z.object({
+        details: z.object({
+          name: z.string(),
+          age: z.number(),
+          preferences: z.object({
+            favoriteColor: z.string(),
+            hobbies: z.array(z.string()),
+          }),
+        }),
+      }),
+    }),
+  });
+  const model = new ChatGoogleGenerativeAI({
+    model: "gemini-1.5-flash",
+    temperature: 0.7,
+  });
+  const structuredLlm = model.withStructuredOutput(schema);
+  const request = "Generate a deeply nested user profile structure.";
+  const result = await structuredLlm.invoke(request);
+  console.log("Deeply Nested Schema Result:", result);
+  expect(result).toBeDefined();
+  expect(result.user.profile.details.preferences).toHaveProperty(
+    "favoriteColor"
+  );
+  expect(Array.isArray(result.user.profile.details.preferences.hobbies)).toBe(
+    true
+  );
+});
+
+test("Google AI - Handle schema with enum fields", async () => {
+  const schema = z.object({
+    name: z.string(),
+    role: z.enum(["admin", "editor", "viewer"]),
+  });
+  const model = new ChatGoogleGenerativeAI({
+    model: "gemini-1.5-flash",
+    temperature: 0.7,
+  });
+  const structuredLlm = model.withStructuredOutput(schema);
+  const request =
+    "Generate structured data with a name and a role (admin, editor, or viewer).";
+  const result = await structuredLlm.invoke(request);
+  console.log("Enum Fields Result:", result);
+  expect(result).toBeDefined();
+  expect(result).toHaveProperty("name");
+  expect(result).toHaveProperty("role");
+  expect(["admin", "editor", "viewer"]).toContain(result.role);
+});