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import { describe, it, expect, beforeAll, afterAll } from "bun:test";
import type { Server } from "bun";
import { OpenAIService } from "../src/openai-service";
describe("End-to-End Tool Calling Tests", () => {
let server: Server;
let baseUrl: string;
beforeAll(async () => {
// Create a separate server instance for testing on a different port
const openAIService = new OpenAIService();
const testPort = 3001;
server = Bun.serve({
port: testPort,
async fetch(req) {
const url = new URL(req.url);
// CORS headers
const corsHeaders = {
"Access-Control-Allow-Origin": "*",
"Access-Control-Allow-Methods": "GET, POST, OPTIONS",
"Access-Control-Allow-Headers": "Content-Type, Authorization",
};
// Handle preflight requests
if (req.method === "OPTIONS") {
return new Response(null, { headers: corsHeaders });
}
try {
// Health check endpoint
if (url.pathname === "/health" && req.method === "GET") {
return new Response(JSON.stringify({ status: "ok" }), {
headers: { "Content-Type": "application/json", ...corsHeaders },
});
}
// Models endpoint
if (url.pathname === "/v1/models" && req.method === "GET") {
const models = openAIService.getModels();
return new Response(JSON.stringify(models), {
headers: { "Content-Type": "application/json", ...corsHeaders },
});
}
// Chat completions endpoint
if (
url.pathname === "/v1/chat/completions" &&
req.method === "POST"
) {
const body = await req.json();
const validatedRequest = openAIService.validateRequest(body);
// Handle streaming
if (validatedRequest.stream) {
const stream =
await openAIService.createChatCompletionStream(
validatedRequest
);
return new Response(stream, {
headers: {
"Content-Type": "text/event-stream",
"Cache-Control": "no-cache",
Connection: "keep-alive",
...corsHeaders,
},
});
}
// Handle non-streaming
const completion =
await openAIService.createChatCompletion(validatedRequest);
return new Response(JSON.stringify(completion), {
headers: { "Content-Type": "application/json", ...corsHeaders },
});
}
// 404 for unknown endpoints
return new Response(
JSON.stringify({
error: {
message: "Not found",
type: "invalid_request_error",
},
}),
{
status: 404,
headers: { "Content-Type": "application/json", ...corsHeaders },
}
);
} catch (error) {
console.error("Server error:", error);
const errorMessage =
error instanceof Error ? error.message : "Internal server error";
const statusCode =
errorMessage.includes("required") || errorMessage.includes("must")
? 400
: 500;
return new Response(
JSON.stringify({
error: {
message: errorMessage,
type:
statusCode === 400
? "invalid_request_error"
: "internal_server_error",
},
}),
{
status: statusCode,
headers: { "Content-Type": "application/json", ...corsHeaders },
}
);
}
},
});
baseUrl = `http://localhost:${testPort}`;
// Wait a bit for server to be ready
await new Promise((resolve) => setTimeout(resolve, 100));
});
afterAll(() => {
if (server) {
server.stop();
}
});
describe("Function Calling API", () => {
it("should handle basic function calling request", async () => {
const request = {
model: "gpt-4o-mini",
messages: [{ role: "user", content: "What time is it?" }],
tools: [
{
type: "function",
function: {
name: "get_current_time",
description: "Get the current time",
},
},
],
};
const response = await fetch(`${baseUrl}/v1/chat/completions`, {
method: "POST",
headers: {
"Content-Type": "application/json",
},
body: JSON.stringify(request),
});
expect(response.status).toBe(200);
const data = await response.json();
expect(data.object).toBe("chat.completion");
expect(data.choices).toHaveLength(1);
expect(data.choices[0].message.role).toBe("assistant");
// The response should either contain tool_calls or regular content
// depending on whether the AI decided to call the function
if (data.choices[0].finish_reason === "tool_calls") {
expect(data.choices[0].message.tool_calls).toBeDefined();
expect(data.choices[0].message.content).toBe(null);
} else {
expect(data.choices[0].message.content).toBeTypeOf("string");
}
});
it("should handle calculate function", async () => {
const request = {
model: "gpt-4o-mini",
messages: [{ role: "user", content: "Calculate 15 + 27" }],
tools: [
{
type: "function",
function: {
name: "calculate",
description: "Perform mathematical calculations",
parameters: {
type: "object",
properties: {
expression: {
type: "string",
description: "Mathematical expression to evaluate",
},
},
required: ["expression"],
},
},
},
],
tool_choice: "required",
};
const response = await fetch(`${baseUrl}/v1/chat/completions`, {
method: "POST",
headers: {
"Content-Type": "application/json",
},
body: JSON.stringify(request),
});
expect(response.status).toBe(200);
const data = await response.json();
// With tool_choice: "required", we should get a function call
expect(data.choices[0].finish_reason).toBe("tool_calls");
expect(data.choices[0].message.tool_calls).toHaveLength(1);
expect(data.choices[0].message.tool_calls[0].function.name).toBe(
"calculate"
);
});
it("should handle weather function", async () => {
const request = {
model: "gpt-4o-mini",
messages: [
{
role: "user",
content: "What's the weather like in San Francisco?",
},
],
tools: [
{
type: "function",
function: {
name: "get_weather",
description: "Get weather information for a location",
parameters: {
type: "object",
properties: {
location: {
type: "string",
description: "The city and state, e.g. San Francisco, CA",
},
},
required: ["location"],
},
},
},
],
};
const response = await fetch(`${baseUrl}/v1/chat/completions`, {
method: "POST",
headers: {
"Content-Type": "application/json",
},
body: JSON.stringify(request),
});
expect(response.status).toBe(200);
const data = await response.json();
expect(data.object).toBe("chat.completion");
expect(data.choices[0].message.role).toBe("assistant");
});
it("should handle streaming with tools", async () => {
const request = {
model: "gpt-4o-mini",
messages: [{ role: "user", content: "What time is it?" }],
tools: [
{
type: "function",
function: {
name: "get_current_time",
description: "Get the current time",
},
},
],
stream: true,
};
const response = await fetch(`${baseUrl}/v1/chat/completions`, {
method: "POST",
headers: {
"Content-Type": "application/json",
},
body: JSON.stringify(request),
});
expect(response.status).toBe(200);
expect(response.headers.get("content-type")).toBe("text/event-stream");
const reader = response.body?.getReader();
expect(reader).toBeDefined();
let chunks: string[] = [];
let done = false;
while (!done && chunks.length < 10) {
// Limit to prevent infinite loop
const { value, done: streamDone } = await reader!.read();
done = streamDone;
if (value) {
const text = new TextDecoder().decode(value);
chunks.push(text);
}
}
const fullResponse = chunks.join("");
expect(fullResponse).toContain("data:");
expect(fullResponse).toContain("[DONE]");
});
it("should reject invalid tool definitions", async () => {
const request = {
model: "gpt-4o-mini",
messages: [{ role: "user", content: "Hello" }],
tools: [
{
type: "invalid_type",
function: {
name: "test",
},
},
],
};
const response = await fetch(`${baseUrl}/v1/chat/completions`, {
method: "POST",
headers: {
"Content-Type": "application/json",
},
body: JSON.stringify(request),
});
expect(response.status).toBe(400);
const data = await response.json();
expect(data.error.message).toContain("Invalid tools");
});
it("should handle tool_choice none", async () => {
const request = {
model: "gpt-4o-mini",
messages: [{ role: "user", content: "What time is it?" }],
tools: [
{
type: "function",
function: {
name: "get_current_time",
description: "Get the current time",
},
},
],
tool_choice: "none",
};
const response = await fetch(`${baseUrl}/v1/chat/completions`, {
method: "POST",
headers: {
"Content-Type": "application/json",
},
body: JSON.stringify(request),
});
expect(response.status).toBe(200);
const data = await response.json();
// With tool_choice: "none", we should get regular content, not function calls
expect(data.choices[0].message.content).toBeTypeOf("string");
expect(data.choices[0].finish_reason).toBe("stop");
});
it("should handle multi-turn conversation with tools", async () => {
const request = {
model: "gpt-4o-mini",
messages: [
{ role: "user", content: "What time is it?" },
{
role: "assistant",
content: null,
tool_calls: [
{
id: "call_1",
type: "function",
function: {
name: "get_current_time",
arguments: "{}",
},
},
],
},
{
role: "tool",
content: "2024-01-15T10:30:00Z",
tool_call_id: "call_1",
},
{
role: "user",
content: "Thanks! Can you also calculate 10 + 5?",
},
],
tools: [
{
type: "function",
function: {
name: "get_current_time",
description: "Get the current time",
},
},
{
type: "function",
function: {
name: "calculate",
description: "Perform mathematical calculations",
parameters: {
type: "object",
properties: {
expression: {
type: "string",
description: "Mathematical expression to evaluate",
},
},
required: ["expression"],
},
},
},
],
};
const response = await fetch(`${baseUrl}/v1/chat/completions`, {
method: "POST",
headers: {
"Content-Type": "application/json",
},
body: JSON.stringify(request),
});
expect(response.status).toBe(200);
const data = await response.json();
expect(data.object).toBe("chat.completion");
expect(data.choices[0].message.role).toBe("assistant");
});
});
describe("Error Handling", () => {
it("should handle malformed tool messages", async () => {
const request = {
model: "gpt-4o-mini",
messages: [
{
role: "tool",
content: "Some result",
// Missing tool_call_id
},
],
};
const response = await fetch(`${baseUrl}/v1/chat/completions`, {
method: "POST",
headers: {
"Content-Type": "application/json",
},
body: JSON.stringify(request),
});
expect(response.status).toBe(400);
const data = await response.json();
expect(data.error.message).toContain("tool_call_id");
});
it("should handle missing function parameters", async () => {
const request = {
model: "gpt-4o-mini",
messages: [{ role: "user", content: "Hello" }],
tools: [
{
type: "function",
function: {
// Missing name
description: "A test function",
},
},
],
};
const response = await fetch(`${baseUrl}/v1/chat/completions`, {
method: "POST",
headers: {
"Content-Type": "application/json",
},
body: JSON.stringify(request),
});
expect(response.status).toBe(400);
const data = await response.json();
expect(data.error.message).toContain("function name is required");
});
});
});
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