import { describe, it, expect, vi, beforeEach } from 'vitest';import { resolveRemoteTrackingRefForPrBase } from '../shared/git/git-diff.js';import type { SimpleGit } from 'simple-git'; describe('resolveRemoteTrackingRefForPrBase', () => {  let revparseResults: Map<string, string>;   beforeEach(() => {    revparseResults = new Map([      ['upstream/develop', 'sha-up'],      ['origin/develop', 'sha-or'],    ]);  });   function mockGit(): SimpleGit {    return {      revparse: vi.fn(async (args: string[]) => {        const ref = args[0];        if (revparseResults.has(ref)) return revparseResults.get(ref)!;        throw new Error(`unknown ref ${ref}`);      }),    } as unknown as SimpleGit;  }   it('prefers upstream/base when baseRepoCloneUrl is set (fork PR)', async () => {    revparseResults.delete('origin/develop');    const ref = await resolveRemoteTrackingRefForPrBase(mockGit(), {      baseBranch: 'develop',      baseRepoCloneUrl: 'https://github.com/upstream/repo.git',    });    expect(ref).toBe('upstream/develop');  });   it('falls back to origin/base when upstream missing but origin exists', async () => {    revparseResults.delete('upstream/develop');    const ref = await resolveRemoteTrackingRefForPrBase(mockGit(), {      baseBranch: 'develop',      baseRepoCloneUrl: 'https://github.com/upstream/repo.git',    });    expect(ref).toBe('origin/develop');  });   it('prefers origin first when not a fork clone (no baseRepoCloneUrl)', async () => {    const ref = await resolveRemoteTrackingRefForPrBase(mockGit(), { baseBranch: 'develop' });    expect(ref).toBe('origin/develop');  });   it('returns first candidate when neither ref exists (caller diff will fail empty)', async () => {    revparseResults.clear();    const ref = await resolveRemoteTrackingRefForPrBase(mockGit(), {      baseBranch: 'develop',      baseRepoCloneUrl: 'https://github.com/x/y.git',    });    expect(ref).toBe('upstream/develop');  });});