unleash-server/dist/lib/middleware/conditional-middleware.test.js

Unleash is an enterprise ready feature flag service. It provides different strategies for handling feature flags.

import { vi } from 'vitest';
import { conditionalMiddleware, requireFeatureEnabled, } from './conditional-middleware.js';
test('conditionalMiddleware should run middleware when condition is true', () => {
    const middleware = vi.fn((_req, _res, next) => next());
    const next = vi.fn();
    conditionalMiddleware(() => true, middleware)({}, {}, next);
    expect(middleware).toHaveBeenCalled();
    expect(next).toHaveBeenCalledWith();
});
test('requireFeatureEnabled should call next when feature is enabled', () => {
    const next = vi.fn();
    const flagResolver = {
        isEnabled: vi.fn().mockReturnValue(true),
    };
    // @ts-expect-error the feature name does not exist, it's only for testing
    requireFeatureEnabled(flagResolver, 'changeRequestEnabled')({}, {}, next);
    expect(flagResolver.isEnabled).toHaveBeenCalledWith('changeRequestEnabled');
    expect(next).toHaveBeenCalledWith();
});
test('requireFeatureEnabled should return 404 when feature is disabled', () => {
    const next = vi.fn();
    const sendStatus = vi.fn();
    const flagResolver = {
        isEnabled: vi.fn().mockReturnValue(false),
    };
    // @ts-expect-error the feature name does not exist, it's only for testing
    requireFeatureEnabled(flagResolver, 'changeRequestEnabled')({}, { sendStatus }, next);
    expect(next).not.toHaveBeenCalled();
    expect(sendStatus).toHaveBeenCalledWith(404);
});
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