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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
import {
getEffectiveModel,
type EffectiveModelCheckResult,
} from './modelCheck.js';
import {
DEFAULT_GEMINI_MODEL,
DEFAULT_GEMINI_FLASH_MODEL,
} from '../config/config.js';
// Mock global fetch
global.fetch = vi.fn();
// Mock AbortController
const mockAbort = vi.fn();
global.AbortController = vi.fn(() => ({
signal: { aborted: false }, // Start with not aborted
abort: mockAbort,
// eslint-disable-next-line @typescript-eslint/no-explicit-any
})) as any;
describe('getEffectiveModel', () => {
const apiKey = 'test-api-key';
beforeEach(() => {
vi.useFakeTimers();
vi.clearAllMocks();
// Reset signal for each test if AbortController mock is more complex
global.AbortController = vi.fn(() => ({
signal: { aborted: false },
abort: mockAbort,
// eslint-disable-next-line @typescript-eslint/no-explicit-any
})) as any;
});
afterEach(() => {
vi.restoreAllMocks();
vi.useRealTimers();
});
describe('when currentConfiguredModel is not DEFAULT_GEMINI_MODEL', () => {
it('should return the currentConfiguredModel and switched: false without fetching', async () => {
const customModel = 'custom-model-name';
const result = await getEffectiveModel(apiKey, customModel);
expect(result).toEqual({
effectiveModel: customModel,
switched: false,
});
expect(fetch).not.toHaveBeenCalled();
});
});
describe('when currentConfiguredModel is DEFAULT_GEMINI_MODEL', () => {
it('should switch to DEFAULT_GEMINI_FLASH_MODEL if fetch returns 429', async () => {
(fetch as vi.Mock).mockResolvedValueOnce({
ok: false,
status: 429,
});
const result: EffectiveModelCheckResult = await getEffectiveModel(
apiKey,
DEFAULT_GEMINI_MODEL,
);
expect(result).toEqual({
effectiveModel: DEFAULT_GEMINI_FLASH_MODEL,
switched: true,
originalModelIfSwitched: DEFAULT_GEMINI_MODEL,
});
expect(fetch).toHaveBeenCalledTimes(1);
expect(fetch).toHaveBeenCalledWith(
`https://generativelanguage.googleapis.com/v1beta/models/${DEFAULT_GEMINI_MODEL}:generateContent?key=${apiKey}`,
expect.any(Object),
);
});
it('should return DEFAULT_GEMINI_MODEL if fetch returns 200', async () => {
(fetch as vi.Mock).mockResolvedValueOnce({
ok: true,
status: 200,
});
const result = await getEffectiveModel(apiKey, DEFAULT_GEMINI_MODEL);
expect(result).toEqual({
effectiveModel: DEFAULT_GEMINI_MODEL,
switched: false,
});
expect(fetch).toHaveBeenCalledTimes(1);
});
it('should return DEFAULT_GEMINI_MODEL if fetch returns a non-429 error status (e.g., 500)', async () => {
(fetch as vi.Mock).mockResolvedValueOnce({
ok: false,
status: 500,
});
const result = await getEffectiveModel(apiKey, DEFAULT_GEMINI_MODEL);
expect(result).toEqual({
effectiveModel: DEFAULT_GEMINI_MODEL,
switched: false,
});
expect(fetch).toHaveBeenCalledTimes(1);
});
it('should return DEFAULT_GEMINI_MODEL if fetch throws a network error', async () => {
(fetch as vi.Mock).mockRejectedValueOnce(new Error('Network error'));
const result = await getEffectiveModel(apiKey, DEFAULT_GEMINI_MODEL);
expect(result).toEqual({
effectiveModel: DEFAULT_GEMINI_MODEL,
switched: false,
});
expect(fetch).toHaveBeenCalledTimes(1);
});
it('should return DEFAULT_GEMINI_MODEL if fetch times out', async () => {
// Simulate AbortController's signal changing and fetch throwing AbortError
const abortControllerInstance = {
signal: { aborted: false }, // mutable signal
abort: vi.fn(() => {
abortControllerInstance.signal.aborted = true; // Use abortControllerInstance
}),
};
(global.AbortController as vi.Mock).mockImplementationOnce(
() => abortControllerInstance,
);
(fetch as vi.Mock).mockImplementationOnce(
async ({ signal }: { signal: AbortSignal }) => {
// Simulate the timeout advancing and abort being called
vi.advanceTimersByTime(2000);
if (signal.aborted) {
throw new DOMException('Aborted', 'AbortError');
}
// Should not reach here in a timeout scenario
return { ok: true, status: 200 };
},
);
const resultPromise = getEffectiveModel(apiKey, DEFAULT_GEMINI_MODEL);
// Ensure timers are advanced to trigger the timeout within getEffectiveModel
await vi.advanceTimersToNextTimerAsync(); // Or advanceTimersByTime(2000) if more precise control is needed
const result = await resultPromise;
expect(mockAbort).toHaveBeenCalledTimes(0); // setTimeout calls controller.abort(), not our direct mockAbort
expect(abortControllerInstance.abort).toHaveBeenCalledTimes(1);
expect(result).toEqual({
effectiveModel: DEFAULT_GEMINI_MODEL,
switched: false,
});
expect(fetch).toHaveBeenCalledTimes(1);
});
it('should correctly pass API key and model in the fetch request', async () => {
(fetch as vi.Mock).mockResolvedValueOnce({ ok: true, status: 200 });
const specificApiKey = 'specific-key-for-this-test';
await getEffectiveModel(specificApiKey, DEFAULT_GEMINI_MODEL);
expect(fetch).toHaveBeenCalledWith(
`https://generativelanguage.googleapis.com/v1beta/models/${DEFAULT_GEMINI_MODEL}:generateContent?key=${specificApiKey}`,
expect.objectContaining({
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify({
contents: [{ parts: [{ text: 'test' }] }],
generationConfig: {
maxOutputTokens: 1,
temperature: 0,
topK: 1,
thinkingConfig: { thinkingBudget: 0, includeThoughts: false },
},
}),
}),
);
});
});
});
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