fix: onHeaderCell missing title (#929)

* test: test driven

* fix: title missing

Author: zombieJ

src/Cell/index.tsx

@@ -176,11 +176,13 @@ function Cell<RecordType>(props: CellProps<RecordType>) {
   }
 
   // >>>>> Title
-  const title = getTitleFromCellRenderChildren({
-    rowType,
-    ellipsis,
-    children: childNode,
-  });
+  const title =
+    additionalProps.title ??
+    getTitleFromCellRenderChildren({
+      rowType,
+      ellipsis,
+      children: childNode,
+    });
 
   // >>>>> ClassName
   const mergedClassName = classNames(

tests/Cell.spec.tsx

@@ -101,4 +101,25 @@ describe('Table.Cell', () => {
     wrapper.find('button').simulate('click');
     expect(wrapper.find('.rc-table-tbody .rc-table-cell').text()).toEqual('2');
   });
+
+  it('onHeaderCell', () => {
+    const wrapper = mount(
+      <Table
+        columns={[
+          {
+            title: (
+              <div>
+                <p>NotYet</p>
+              </div>
+            ),
+            onHeaderCell: () => ({
+              title: 'Bamboo',
+            }),
+          },
+        ]}
+      />,
+    );
+
+    expect(wrapper.find('thead th').prop('title')).toEqual('Bamboo');
+  });
 });