Improve code coverage unit tests

1 files changed, 2 insertions, 2 deletions

diff --git a/chart.go b/chart.go
index 8b38d22..b5ff3d1 100644
--- a/chart.go
+++ b/chart.go
@@ -1,4 +1,4 @@
-// Copyright 2016 - 2019 The excelize Authors. All rights reserved. Use of
+// Copyright 2016 - 2020 The excelize Authors. All rights reserved. Use of
 // this source code is governed by a BSD-style license that can be found in
 // the LICENSE file.
 //
@@ -657,6 +657,7 @@ func parseFormatChartSet(formatSet string) (*formatChart, error) {
 //
 //    major_grid_lines
 //    minor_grid_lines
+//    tick_label_skip
 //    reverse_order
 //    maximum
 //    minimum
@@ -666,7 +667,6 @@ func parseFormatChartSet(formatSet string) (*formatChart, error) {
 //    major_grid_lines
 //    minor_grid_lines
 //    major_unit
-//    tick_label_skip
 //    reverse_order
 //    maximum
 //    minimum