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import { describe, expect, it } from 'vitest';
import { unifiedDiffStats, ConflictResolver } from './draftGuard';
describe('unifiedDiffStats', () => {
it('counts added and removed lines', () => {
const s = unifiedDiffStats('a\nb\n', 'a\nc\nd\n');
expect(s.added).toBe(2);
expect(s.removed).toBe(1);
});
it('is zero for identical inputs', () => {
const s = unifiedDiffStats('same', 'same');
expect(s.added).toBe(0);
expect(s.removed).toBe(0);
});
});
describe('ConflictResolver', () => {
const local = { generation: 1, code: 'x = 1\n' };
it('flags stale response: server generation ahead of local base', () => {
const r = new ConflictResolver(local);
const verdict = r.onServerState({ generation: 2, code: 'x = 2\n' }, local.generation);
expect(verdict.stale).toBe(true);
});
it('not stale when server generation equals local base generation', () => {
const r = new ConflictResolver(local);
const verdict = r.onServerState({ generation: 1, code: 'x = 1\n' }, local.generation);
expect(verdict.stale).toBe(false);
});
it('force-overwrite plan uses server generation to retry save', () => {
const r = new ConflictResolver(local);
const plan = r.retryPlan({ generation: 2, code: 'x = 2\n' } as const);
expect(plan).toEqual({ generation: 2, code: 'x = 1\n' });
});
});
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