feat:拼单订单新增一个取消部分的按钮功能，点击之后，打手进行中和待接单的都会取消订单

apps/backend/src/domain/work-order-sharing-part-cancel.test.ts

@@ -0,0 +1,103 @@
+import assert from 'node:assert/strict'
+import test from 'node:test'
+import {
+  resolveSharingPartCancelPlan,
+  resolveSharingPartCancelRefund,
+} from './work-order-sharing-part-cancel.js'
+
+test('取消部分：保留已验收份数，取消进行中 + 待接单份数', () => {
+  const plan = resolveSharingPartCancelPlan({
+    workOrderStatus: 'open',
+    totalQuantity: 10,
+    acceptedQuantity: 8,
+  })
+  assert.deepEqual(plan, { nextTotalQuantity: 8, cancelledQuantity: 2, failureReason: null })
+})
+
+test('取消部分：一份都没验收时整单取消（总量归零）', () => {
+  const plan = resolveSharingPartCancelPlan({
+    workOrderStatus: 'pending_acceptance',
+    totalQuantity: 10,
+    acceptedQuantity: 0,
+  })
+  assert.deepEqual(plan, { nextTotalQuantity: 0, cancelledQuantity: 10, failureReason: null })
+})
+
+test('取消部分：全部份额已验收时没有可取消份数', () => {
+  const plan = resolveSharingPartCancelPlan({
+    workOrderStatus: 'accepted',
+    totalQuantity: 8,
+    acceptedQuantity: 8,
+  })
+  // accepted 不在允许状态里，优先报状态非法
+  assert.equal(plan.failureReason, 'status_invalid')
+
+  const openPlan = resolveSharingPartCancelPlan({
+    workOrderStatus: 'open',
+    totalQuantity: 8,
+    acceptedQuantity: 8,
+  })
+  assert.deepEqual(openPlan, {
+    nextTotalQuantity: 8,
+    cancelledQuantity: 0,
+    failureReason: 'nothing_to_cancel',
+  })
+})
+
+test('取消部分：问题单允许操作，已取消/已验收单不允许', () => {
+  assert.equal(
+    resolveSharingPartCancelPlan({
+      workOrderStatus: 'problem',
+      totalQuantity: 3,
+      acceptedQuantity: 1,
+    }).failureReason,
+    null,
+  )
+  for (const status of ['cancelled', 'accepted', 'unassigned']) {
+    assert.equal(
+      resolveSharingPartCancelPlan({
+        workOrderStatus: status,
+        totalQuantity: 3,
+        acceptedQuantity: 0,
+      }).failureReason,
+      'status_invalid',
+    )
+  }
+})
+
+test('取消部分：已验收份数异常时按总量截断', () => {
+  const plan = resolveSharingPartCancelPlan({
+    workOrderStatus: 'open',
+    totalQuantity: 5,
+    acceptedQuantity: 9,
+  })
+  assert.deepEqual(plan, {
+    nextTotalQuantity: 5,
+    cancelledQuantity: 0,
+    failureReason: 'nothing_to_cancel',
+  })
+})
+
+test('取消部分退款：按实付金额比例计算并四舍五入到分', () => {
+  assert.equal(
+    resolveSharingPartCancelRefund({
+      paidAmountFen: 20000,
+      totalQuantity: 10,
+      cancelledQuantity: 9,
+    }),
+    18000,
+  )
+  assert.equal(
+    resolveSharingPartCancelRefund({ paidAmountFen: 999, totalQuantity: 3, cancelledQuantity: 1 }),
+    333,
+  )
+  assert.equal(
+    resolveSharingPartCancelRefund({ paidAmountFen: 0, totalQuantity: 10, cancelledQuantity: 10 }),
+    0,
+  )
+  // 取消份数超过总量时按总量截断
+  assert.equal(
+    resolveSharingPartCancelRefund({ paidAmountFen: 5000, totalQuantity: 5, cancelledQuantity: 8 }),
+    5000,
+  )
+})