diff --git a/xlsxlite/test/test_perf.py b/xlsxlite/test/test_perf.py
index 0220101..679918d 100644
--- a/xlsxlite/test/test_perf.py
+++ b/xlsxlite/test/test_perf.py
@@ -4,8 +4,8 @@
 import xlsxwriter
 
 from openpyxl import Workbook
-from openpyxl.worksheet.write_only import WriteOnlyCell
-from openpyxl.writer.etree_worksheet import etree_write_cell
+from openpyxl.cell.cell import WriteOnlyCell
+from openpyxl.cell._writer import etree_write_cell
 from unittest.mock import patch
 from xlsxlite.writer import XLSXBook
 from .base import tests_dir  # noqa
@@ -32,7 +32,7 @@ def test_xlxslite():
 
 
 @pytest.mark.usefixtures("tests_dir")
-@patch("openpyxl.worksheet.write_only.write_cell")
+@patch("openpyxl.cell._writer.write_cell")
 def test_openpyxl_etree(mock_write_cell):
     mock_write_cell.side_effect = etree_write_cell
 
diff --git a/xlsxlite/test/test_writer.py b/xlsxlite/test/test_writer.py
index 701fc59..38a644f 100644
--- a/xlsxlite/test/test_writer.py
+++ b/xlsxlite/test/test_writer.py
@@ -40,9 +40,9 @@ def test_simple(self):
         assert sheet2.title == "People"
         assert sheet3.title == "Empty"
 
-        self.assertExcelSheet(sheet1, [()])
+        self.assertExcelSheet(sheet1, [])
         self.assertExcelSheet(sheet2, [("Name", "Email"), ("Jim", "jim@acme.com"), ("Bob", "bob@acme.com")])
-        self.assertExcelSheet(sheet3, [()])
+        self.assertExcelSheet(sheet3, [])
 
     def test_cell_types(self):
         d1 = datetime(2013, 1, 1, 12, 0, 0)