import { describe, test, expect, mock } from 'bun:test';
import { upgradeAction } from './upgrade';

describe('upgradeAction', () => {
    test('returns null when already on latest', async () => {
        const result = await upgradeAction({
            currentVersion: '1.2.0',
            checkLatest: async () => '1.2.0',
            install: mock(() => Promise.resolve(0)),
        });
        expect(result).toBeNull();
    });

    test('returns versions when upgrade available and install succeeds', async () => {
        const installFn = mock(() => Promise.resolve(0));
        const result = await upgradeAction({
            currentVersion: '1.2.0',
            checkLatest: async () => '1.3.0',
            install: installFn,
        });
        expect(result).toEqual({ previousVersion: '1.2.0', newVersion: '1.3.0' });
        expect(installFn).toHaveBeenCalledWith('1.3.0');
    });

    test('throws when install fails', () => {
        expect(upgradeAction({
            currentVersion: '1.2.0',
            checkLatest: async () => '1.3.0',
            install: mock(() => Promise.resolve(1)),
        })).rejects.toThrow('Upgrade failed');
    });

    test('throws when registry check fails', () => {
        expect(upgradeAction({
            currentVersion: '1.2.0',
            checkLatest: async () => { throw new Error('network'); },
            install: mock(() => Promise.resolve(0)),
        })).rejects.toThrow('network');
    });
});