Add test for link item

Author: colebemis

src/TreeView/TreeView.test.tsx

@@ -648,5 +648,31 @@ describe('Keyboard interactions', () => {
       // Subtree should no longer be visible
       expect(queryByRole('group')).not.toBeInTheDocument()
     })
+
+    it('navigates to href if provided', () => {
+      const windowSpy = jest.spyOn(window, 'open')
+      const onSelect = jest.fn()
+      const {getByRole} = renderWithTheme(
+        <TreeView aria-label="Test tree">
+          <TreeView.LinkItem href="#" onSelect={onSelect}>
+            Item
+          </TreeView.LinkItem>
+        </TreeView>
+      )
+
+      const root = getByRole('tree')
+
+      // Focus tree
+      root.focus()
+
+      // Press Enter
+      fireEvent.keyDown(document.activeElement || document.body, {key: 'Enter'})
+
+      // window.open should have been called
+      expect(windowSpy).toHaveBeenCalledWith('#', '_self')
+
+      // onSelect should have been called
+      expect(onSelect).toHaveBeenCalledTimes(1)
+    })
   })
 })