diff --git a/web/src/lib/projectSettingsDuties.test.ts b/web/src/lib/projectSettingsDuties.test.ts
index 7e6287c7..219851a3 100644
--- a/web/src/lib/projectSettingsDuties.test.ts
+++ b/web/src/lib/projectSettingsDuties.test.ts
@@ -7,6 +7,8 @@ import {
   clientDutyIssues,
   locateDutyIssue,
   needsThreeMembersForDuties,
+  resolveClientDocTaskDuty,
+  toggleAuthorOnly,
   toggleHumanApproval,
 } from './projectSettingsDuties';
 
@@ -81,4 +83,91 @@ describe('projectSettingsDuties', () => {
     ]);
     assert.equal(needsThreeMembersForDuties(draft), true);
   });
+
+  it('resolves author_only to A/A/A without three-member requirement', () => {
+    const task = {
+      task_key: 'intake',
+      enabled: true,
+      approval_configurable: true,
+      duty_policy: 'author_only' as const,
+      duties: { author_user_id: 7 },
+    };
+    const resolved = resolveClientDocTaskDuty(task);
+    assert.equal(resolved.mode, 'full');
+    assert.equal(resolved.isAuthorOnly, true);
+    assert.deepEqual(resolved.effective, {
+      author_user_id: 7,
+      reviewer_user_id: 7,
+      approver_user_id: 7,
+    });
+    const draft = plan([task]);
+    assert.equal(needsThreeMembersForDuties(draft), false);
+    assert.deepEqual(clientDutyIssues(draft, [{ userId: 7 }]), []);
+  });
+
+  it('rejects author_only without author or with conflicting reviewers', () => {
+    const missing = plan([
+      {
+        task_key: 'intake',
+        task_title: '需求',
+        enabled: true,
+        approval_configurable: true,
+        duty_policy: 'author_only',
+        duties: {},
+      },
+    ]);
+    assert.equal(
+      locateDutyIssue(clientDutyIssues(missing, [{ userId: 1 }]), 'intake')?.code,
+      'AUTHOR_ONLY_AUTHOR_REQUIRED',
+    );
+
+    const conflict = plan([
+      {
+        task_key: 'intake',
+        task_title: '需求',
+        enabled: true,
+        approval_configurable: true,
+        duty_policy: 'author_only',
+        duties: { author_user_id: 1, reviewer_user_id: 2 },
+      },
+    ]);
+    assert.equal(
+      locateDutyIssue(clientDutyIssues(conflict, [{ userId: 1 }, { userId: 2 }]), 'intake')?.code,
+      'AUTHOR_ONLY_DUTY_CONFLICT',
+    );
+  });
+
+  it('mixed full + author_only still requires three members for the full doc', () => {
+    const draft = plan([
+      {
+        task_key: 'intake',
+        enabled: true,
+        approval_configurable: true,
+        duties: { author_user_id: 1, reviewer_user_id: 2, approver_user_id: 3 },
+      },
+      {
+        task_key: 'research',
+        enabled: true,
+        approval_configurable: true,
+        duty_policy: 'author_only',
+        duties: { author_user_id: 1 },
+      },
+    ]);
+    assert.equal(needsThreeMembersForDuties(draft), true);
+  });
+
+  it('toggleAuthorOnly clears review/approve slots and restores on disable', () => {
+    const base = {
+      task_key: 'intake',
+      enabled: true,
+      approval_configurable: true,
+      duties: { author_user_id: 7, reviewer_user_id: 2, approver_user_id: 3 },
+    };
+    const on = toggleAuthorOnly(base, true);
+    assert.equal(on.duty_policy, 'author_only');
+    assert.deepEqual(on.duties, { author_user_id: 7 });
+    const off = toggleAuthorOnly(on, false);
+    assert.equal(off.duty_policy, '');
+    assert.deepEqual(off.duties, { author_user_id: 7 });
+  });
 });