fix(pagination): page count is not correct when item-count is 0

CHANGELOG.en-US.md

@@ -6,6 +6,10 @@
 
 - `n-rate` add `allow-half` prop.
 
+### Fixes
+
+- Fix `n-pagination` page count is not correct when `item-count` is 0.
+
 ## 2.15.4 (2021-07-09)
 
 ### Feats

CHANGELOG.zh-CN.md

@@ -6,6 +6,10 @@
 
 - `n-rate` 新增 `allow-half` 属性
 
+### Fixes
+
+- 修复 `n-pagination` `item-count` 为 0 时页数不对
+
 ## 2.15.4 (2021-07-09)
 
 ### Feats

src/pagination/src/Pagination.tsx

@@ -125,7 +125,7 @@ export default defineComponent({
       // item count has high priority, for it can affect prefix slot rendering
       const { itemCount } = props
       if (itemCount !== undefined) {
-        return Math.ceil(itemCount / mergedPageSizeRef.value)
+        return Math.max(1, Math.ceil(itemCount / mergedPageSizeRef.value))
       }
       const { pageCount } = props
       if (pageCount !== undefined) return pageCount

src/pagination/tests/Pagination.spec.ts

@@ -5,4 +5,17 @@ describe('n-pagination', () => {
   it('should work with import on demand', () => {
     mount(NPagination)
   })
+  it('props.itemCount', async () => {
+    const wrapper = mount(NPagination, {
+      props: {
+        itemCount: 1,
+        pageSize: 10
+      }
+    })
+    expect(wrapper.findAll('.n-pagination-item').length).toEqual(3)
+    await wrapper.setProps({
+      itemCount: 11
+    })
+    expect(wrapper.findAll('.n-pagination-item').length).toEqual(4)
+  })
 })