fix(需求池): 修复列表换行和版本解绑状态

apps/web/lib/requirement-version-link.test.ts

@@ -0,0 +1,63 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+
+import type { Requirement } from './requirement';
+import {
+  getRequirementVersionSelectionPatch,
+  getRequirementVersionUnlinkPatch,
+} from './requirement-version-link';
+
+function requirement(patch: Partial<Requirement> = {}): Requirement {
+  return {
+    id: 'req-1',
+    code: 'REQ-001',
+    title: 'Requirement',
+    description: '',
+    productId: 'product-1',
+    projectId: 'project-1',
+    versionId: 'version-1',
+    sourceType: 'internal',
+    sourceTarget: '',
+    platforms: [],
+    typeId: 'type-1',
+    status: 'planned',
+    priority: 'P2',
+    effort: 'M',
+    creator: 'tester',
+    createdAt: '2026-07-02T00:00:00.000Z',
+    addedToVersionBy: 'pm',
+    ...patch,
+  };
+}
+
+test('unlinking a version-scoped requirement returns it to adopted', () => {
+  for (const status of ['planned', 'developing', 'testing', 'released'] as const) {
+    assert.deepEqual(getRequirementVersionUnlinkPatch(requirement({ status })), {
+      versionId: undefined,
+      addedToVersionBy: undefined,
+      status: 'adopted',
+    });
+  }
+});
+
+test('unlinking keeps other requirement statuses unchanged', () => {
+  assert.deepEqual(getRequirementVersionUnlinkPatch(requirement({ status: 'adopted' })), {
+    versionId: undefined,
+    addedToVersionBy: undefined,
+  });
+});
+
+test('clearing version from requirement edit uses the same unlink semantics', () => {
+  assert.deepEqual(getRequirementVersionSelectionPatch(requirement(), ''), {
+    versionId: undefined,
+    addedToVersionBy: undefined,
+    status: 'adopted',
+  });
+});
+
+test('selecting a version preserves the current business status', () => {
+  assert.deepEqual(getRequirementVersionSelectionPatch(requirement({ status: 'adopted' }), 'version-2', 'pm2'), {
+    versionId: 'version-2',
+    addedToVersionBy: 'pm2',
+  });
+});