feat(Bug): 状态流转接入单条工作流

apps/web/lib/bug-workflow.test.ts

@@ -0,0 +1,61 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+
+import type { Bug } from './bug';
+import { applyBugTransition } from './bug-workflow';
+
+function bug(patch: Partial<Bug> = {}): Bug {
+  return {
+    id: 'bug-1',
+    bugNo: 'BUG-001',
+    versionId: 'version-1',
+    testCaseId: 'tc-1',
+    title: '排序未保存',
+    description: '拖拽后刷新丢失',
+    severity: 'major',
+    priority: 'P1',
+    reportedBy: 'QA',
+    assigneeId: 'Dev',
+    status: 'open',
+    logs: [],
+    createdAt: '2026-06-25T00:00:00.000Z',
+    updatedAt: '2026-06-25T00:00:00.000Z',
+    ...patch,
+  };
+}
+
+test('open to fixing returns a single bug status patch', () => {
+  const result = applyBugTransition(bug(), 'fixing', 'Dev', {
+    now: new Date('2026-06-25T01:00:00.000Z'),
+  });
+
+  assert.equal(result.ok, true);
+  assert.equal(result.patch?.status, 'fixing');
+  assert.equal(result.patch?.logs?.length, 1);
+});
+
+test('fixing to fixed writes resolvedAt and resolution', () => {
+  const result = applyBugTransition(bug({ status: 'fixing' }), 'fixed', 'Dev', {
+    now: new Date('2026-06-25T02:00:00.000Z'),
+    resolution: '补充保存接口',
+  });
+
+  assert.equal(result.ok, true);
+  assert.equal(result.patch?.resolvedAt, '2026-06-25T02:00:00.000Z');
+  assert.equal(result.patch?.resolution, '补充保存接口');
+});
+
+test('verifying to closed writes closedAt', () => {
+  const result = applyBugTransition(bug({ status: 'verifying' }), 'closed', 'QA', {
+    now: new Date('2026-06-25T03:00:00.000Z'),
+  });
+
+  assert.equal(result.ok, true);
+  assert.equal(result.patch?.closedAt, '2026-06-25T03:00:00.000Z');
+});
+
+test('invalid bug transition is rejected', () => {
+  const result = applyBugTransition(bug(), 'closed', 'QA');
+
+  assert.equal(result.ok, false);
+});