test: add strict tool-calling tests for responses

Author: Nitinref

libs/providers/langchain-openai/src/chat_models/tests/responses.strict.test.ts

@@ -0,0 +1,53 @@
+import { describe, it, expect } from "vitest";
+import { ChatOpenAIResponses } from "../responses";
+
+describe("strict tool-calling configuration", () => {
+  it("falls back to supportsStrictToolCalling when strict is undefined", () => {
+    const model = new ChatOpenAIResponses({
+      model: "gpt-4o",
+      supportsStrictToolCalling: true,
+    });
+
+    const params = model.invocationParams({
+      tools: [
+        {
+          type: "function",
+          function: {
+            name: "test_func",
+            description: "testing",
+            parameters: { type: "object", properties: {} },
+          },
+        },
+      ],
+    });
+
+    expect((params as any).strict).toBeUndefined();
+
+    expect((params.tools as any)[0].strict).toBe(true);
+  });
+
+  it("respects user-provided strict option", () => {
+    const model = new ChatOpenAIResponses({
+      model: "gpt-4o",
+      supportsStrictToolCalling: true,
+    });
+
+    const params = model.invocationParams({
+      strict: false,
+      tools: [
+        {
+          type: "function",
+          function: {
+            name: "test_func",
+            description: "testing",
+            parameters: { type: "object", properties: {} },
+          },
+        },
+      ],
+    });
+
+    expect((params as any).strict).toBeUndefined();
+
+    expect((params.tools as any)[0].strict).toBe(false);
+  });
+});