Enable Style/FrozenStringLiteralComment and autocorrect

121 files changed, 239 insertions, 1 deletions

diff --git a/test/benchmark.rb b/test/benchmark.rb
index 9e651596..38dcc8fc 100755
--- a/test/benchmark.rb
+++ b/test/benchmark.rb
@@ -1,4 +1,5 @@
 #!/usr/bin/env ruby -s
+# frozen_string_literal: true
 
 $LOAD_PATH.unshift "#{File.dirname(__FILE__)}/../lib"
 require 'axlsx'
diff --git a/test/content_type/tc_content_type.rb b/test/content_type/tc_content_type.rb
index e94f311e..a3c6603f 100644
--- a/test/content_type/tc_content_type.rb
+++ b/test/content_type/tc_content_type.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestContentType < Test::Unit::TestCase
diff --git a/test/content_type/tc_default.rb b/test/content_type/tc_default.rb
index e3d8d75e..89125bf1 100644
--- a/test/content_type/tc_default.rb
+++ b/test/content_type/tc_default.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestDefault < Test::Unit::TestCase
diff --git a/test/content_type/tc_override.rb b/test/content_type/tc_override.rb
index ad0699b5..73a13410 100644
--- a/test/content_type/tc_override.rb
+++ b/test/content_type/tc_override.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestOverride < Test::Unit::TestCase
diff --git a/test/doc_props/tc_app.rb b/test/doc_props/tc_app.rb
index fbbe0b67..d96723db 100644
--- a/test/doc_props/tc_app.rb
+++ b/test/doc_props/tc_app.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestApp < Test::Unit::TestCase
diff --git a/test/doc_props/tc_core.rb b/test/doc_props/tc_core.rb
index 6d0ce604..9714a6eb 100644
--- a/test/doc_props/tc_core.rb
+++ b/test/doc_props/tc_core.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestCore < Test::Unit::TestCase
diff --git a/test/drawing/tc_area_chart.rb b/test/drawing/tc_area_chart.rb
index 14449349..5829149a 100644
--- a/test/drawing/tc_area_chart.rb
+++ b/test/drawing/tc_area_chart.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestAreaChart < Test::Unit::TestCase
diff --git a/test/drawing/tc_area_series.rb b/test/drawing/tc_area_series.rb
index d77e241d..e7e53269 100644
--- a/test/drawing/tc_area_series.rb
+++ b/test/drawing/tc_area_series.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestAreaSeries < Test::Unit::TestCase
diff --git a/test/drawing/tc_axes.rb b/test/drawing/tc_axes.rb
index 27a90b0b..2e9aab90 100644
--- a/test/drawing/tc_axes.rb
+++ b/test/drawing/tc_axes.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestAxes < Test::Unit::TestCase
diff --git a/test/drawing/tc_axis.rb b/test/drawing/tc_axis.rb
index d62f4fbd..ba359fed 100644
--- a/test/drawing/tc_axis.rb
+++ b/test/drawing/tc_axis.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestAxis < Test::Unit::TestCase
diff --git a/test/drawing/tc_bar_3D_chart.rb b/test/drawing/tc_bar_3D_chart.rb
index aaef0312..d825ce94 100644
--- a/test/drawing/tc_bar_3D_chart.rb
+++ b/test/drawing/tc_bar_3D_chart.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestBar3DChart < Test::Unit::TestCase
diff --git a/test/drawing/tc_bar_chart.rb b/test/drawing/tc_bar_chart.rb
index 9fd52530..0d4fd341 100644
--- a/test/drawing/tc_bar_chart.rb
+++ b/test/drawing/tc_bar_chart.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestBarChart < Test::Unit::TestCase
diff --git a/test/drawing/tc_bar_series.rb b/test/drawing/tc_bar_series.rb
index bbc18b1d..450b67e5 100644
--- a/test/drawing/tc_bar_series.rb
+++ b/test/drawing/tc_bar_series.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestBarSeries < Test::Unit::TestCase
diff --git a/test/drawing/tc_bubble_chart.rb b/test/drawing/tc_bubble_chart.rb
index e596c095..b38e636b 100644
--- a/test/drawing/tc_bubble_chart.rb
+++ b/test/drawing/tc_bubble_chart.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestBubbleChart < Test::Unit::TestCase
diff --git a/test/drawing/tc_bubble_series.rb b/test/drawing/tc_bubble_series.rb
index ef7875ac..78ac1b23 100644
--- a/test/drawing/tc_bubble_series.rb
+++ b/test/drawing/tc_bubble_series.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestBubbleSeries < Test::Unit::TestCase
diff --git a/test/drawing/tc_cat_axis.rb b/test/drawing/tc_cat_axis.rb
index bae314da..db3272e5 100644
--- a/test/drawing/tc_cat_axis.rb
+++ b/test/drawing/tc_cat_axis.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestCatAxis < Test::Unit::TestCase
diff --git a/test/drawing/tc_cat_axis_data.rb b/test/drawing/tc_cat_axis_data.rb
index 09b14be6..23d78090 100644
--- a/test/drawing/tc_cat_axis_data.rb
+++ b/test/drawing/tc_cat_axis_data.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # require 'tc_helper.rb'
 
 # class TestCatAxisData < Test::Unit::TestCase
diff --git a/test/drawing/tc_chart.rb b/test/drawing/tc_chart.rb
index f91bfbbd..c7527e15 100644
--- a/test/drawing/tc_chart.rb
+++ b/test/drawing/tc_chart.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestChart < Test::Unit::TestCase
diff --git a/test/drawing/tc_d_lbls.rb b/test/drawing/tc_d_lbls.rb
index ef391824..76840a6e 100644
--- a/test/drawing/tc_d_lbls.rb
+++ b/test/drawing/tc_d_lbls.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestDLbls < Test::Unit::TestCase
diff --git a/test/drawing/tc_data_source.rb b/test/drawing/tc_data_source.rb
index 4148439b..ea0f1e37 100644
--- a/test/drawing/tc_data_source.rb
+++ b/test/drawing/tc_data_source.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestNumDataSource < Test::Unit::TestCase
diff --git a/test/drawing/tc_drawing.rb b/test/drawing/tc_drawing.rb
index d8c5d1e9..1e72b462 100644
--- a/test/drawing/tc_drawing.rb
+++ b/test/drawing/tc_drawing.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestDrawing < Test::Unit::TestCase
diff --git a/test/drawing/tc_graphic_frame.rb b/test/drawing/tc_graphic_frame.rb
index 8b69040a..fc5743be 100644
--- a/test/drawing/tc_graphic_frame.rb
+++ b/test/drawing/tc_graphic_frame.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestGraphicFrame < Test::Unit::TestCase
diff --git a/test/drawing/tc_hyperlink.rb b/test/drawing/tc_hyperlink.rb
index b9df3ad9..cad418f8 100644
--- a/test/drawing/tc_hyperlink.rb
+++ b/test/drawing/tc_hyperlink.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestHyperlink < Test::Unit::TestCase
diff --git a/test/drawing/tc_line_3d_chart.rb b/test/drawing/tc_line_3d_chart.rb
index 618439ff..2107f1a0 100644
--- a/test/drawing/tc_line_3d_chart.rb
+++ b/test/drawing/tc_line_3d_chart.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestLine3DChart < Test::Unit::TestCase
diff --git a/test/drawing/tc_line_chart.rb b/test/drawing/tc_line_chart.rb
index 98fecc72..460b2055 100644
--- a/test/drawing/tc_line_chart.rb
+++ b/test/drawing/tc_line_chart.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestLineChart < Test::Unit::TestCase
diff --git a/test/drawing/tc_line_series.rb b/test/drawing/tc_line_series.rb
index b0435488..893c587f 100644
--- a/test/drawing/tc_line_series.rb
+++ b/test/drawing/tc_line_series.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestLineSeries < Test::Unit::TestCase
diff --git a/test/drawing/tc_marker.rb b/test/drawing/tc_marker.rb
index 8f521128..3341f8cc 100644
--- a/test/drawing/tc_marker.rb
+++ b/test/drawing/tc_marker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestMarker < Test::Unit::TestCase
diff --git a/test/drawing/tc_named_axis_data.rb b/test/drawing/tc_named_axis_data.rb
index 63fb4610..01c08784 100644
--- a/test/drawing/tc_named_axis_data.rb
+++ b/test/drawing/tc_named_axis_data.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # require 'tc_helper.rb'
 
 # class TestNamedAxisData < Test::Unit::TestCase
diff --git a/test/drawing/tc_num_data.rb b/test/drawing/tc_num_data.rb
index b169faef..e0683984 100644
--- a/test/drawing/tc_num_data.rb
+++ b/test/drawing/tc_num_data.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestNumData < Test::Unit::TestCase
diff --git a/test/drawing/tc_num_val.rb b/test/drawing/tc_num_val.rb
index 3168bd89..e5f3b869 100644
--- a/test/drawing/tc_num_val.rb
+++ b/test/drawing/tc_num_val.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestNumVal < Test::Unit::TestCase
diff --git a/test/drawing/tc_one_cell_anchor.rb b/test/drawing/tc_one_cell_anchor.rb
index 1c28ef52..7f0a7c4a 100644
--- a/test/drawing/tc_one_cell_anchor.rb
+++ b/test/drawing/tc_one_cell_anchor.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestOneCellAnchor < Test::Unit::TestCase
diff --git a/test/drawing/tc_pic.rb b/test/drawing/tc_pic.rb
index 45014f53..daa8b4a3 100644
--- a/test/drawing/tc_pic.rb
+++ b/test/drawing/tc_pic.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestPic < Test::Unit::TestCase
diff --git a/test/drawing/tc_picture_locking.rb b/test/drawing/tc_picture_locking.rb
index a7daf79b..e6db9f59 100644
--- a/test/drawing/tc_picture_locking.rb
+++ b/test/drawing/tc_picture_locking.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestPictureLocking < Test::Unit::TestCase
diff --git a/test/drawing/tc_pie_3D_chart.rb b/test/drawing/tc_pie_3D_chart.rb
index 3a1236db..889e383f 100644
--- a/test/drawing/tc_pie_3D_chart.rb
+++ b/test/drawing/tc_pie_3D_chart.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestPie3DChart < Test::Unit::TestCase
diff --git a/test/drawing/tc_pie_series.rb b/test/drawing/tc_pie_series.rb
index 96c61f94..a0d63cfc 100644
--- a/test/drawing/tc_pie_series.rb
+++ b/test/drawing/tc_pie_series.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestPieSeries < Test::Unit::TestCase
diff --git a/test/drawing/tc_scaling.rb b/test/drawing/tc_scaling.rb
index cc02ee92..eae1950d 100644
--- a/test/drawing/tc_scaling.rb
+++ b/test/drawing/tc_scaling.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestScaling < Test::Unit::TestCase
diff --git a/test/drawing/tc_scatter_chart.rb b/test/drawing/tc_scatter_chart.rb
index 2712da99..92bc8486 100644
--- a/test/drawing/tc_scatter_chart.rb
+++ b/test/drawing/tc_scatter_chart.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestScatterChart < Test::Unit::TestCase
diff --git a/test/drawing/tc_scatter_series.rb b/test/drawing/tc_scatter_series.rb
index f9f5aad0..a550271b 100644
--- a/test/drawing/tc_scatter_series.rb
+++ b/test/drawing/tc_scatter_series.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestScatterSeries < Test::Unit::TestCase
diff --git a/test/drawing/tc_ser_axis.rb b/test/drawing/tc_ser_axis.rb
index 3b752635..6d26b182 100644
--- a/test/drawing/tc_ser_axis.rb
+++ b/test/drawing/tc_ser_axis.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestSerAxis < Test::Unit::TestCase
diff --git a/test/drawing/tc_series.rb b/test/drawing/tc_series.rb
index fad4e763..2215d398 100644
--- a/test/drawing/tc_series.rb
+++ b/test/drawing/tc_series.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestSeries < Test::Unit::TestCase
diff --git a/test/drawing/tc_series_title.rb b/test/drawing/tc_series_title.rb
index 14eb0fba..8950ab6a 100644
--- a/test/drawing/tc_series_title.rb
+++ b/test/drawing/tc_series_title.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestSeriesTitle < Test::Unit::TestCase
diff --git a/test/drawing/tc_str_data.rb b/test/drawing/tc_str_data.rb
index 408e4b98..e8fc0441 100644
--- a/test/drawing/tc_str_data.rb
+++ b/test/drawing/tc_str_data.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestStrData < Test::Unit::TestCase
diff --git a/test/drawing/tc_str_val.rb b/test/drawing/tc_str_val.rb
index 39b96e08..dfff771b 100644
--- a/test/drawing/tc_str_val.rb
+++ b/test/drawing/tc_str_val.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestStrVal < Test::Unit::TestCase
diff --git a/test/drawing/tc_title.rb b/test/drawing/tc_title.rb
index 330a48e6..ee4d12c9 100644
--- a/test/drawing/tc_title.rb
+++ b/test/drawing/tc_title.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestTitle < Test::Unit::TestCase
diff --git a/test/drawing/tc_two_cell_anchor.rb b/test/drawing/tc_two_cell_anchor.rb
index 321cc45a..bfdaf4de 100644
--- a/test/drawing/tc_two_cell_anchor.rb
+++ b/test/drawing/tc_two_cell_anchor.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestTwoCellAnchor < Test::Unit::TestCase
diff --git a/test/drawing/tc_val_axis.rb b/test/drawing/tc_val_axis.rb
index b3a6fb39..bb464048 100644
--- a/test/drawing/tc_val_axis.rb
+++ b/test/drawing/tc_val_axis.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestValAxis < Test::Unit::TestCase
diff --git a/test/drawing/tc_view_3D.rb b/test/drawing/tc_view_3D.rb
index d5550a73..e09edc13 100644
--- a/test/drawing/tc_view_3D.rb
+++ b/test/drawing/tc_view_3D.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestView3D < Test::Unit::TestCase
diff --git a/test/drawing/tc_vml_drawing.rb b/test/drawing/tc_vml_drawing.rb
index ad12642a..815cc556 100644
--- a/test/drawing/tc_vml_drawing.rb
+++ b/test/drawing/tc_vml_drawing.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestVmlDrawing < Test::Unit::TestCase
diff --git a/test/drawing/tc_vml_shape.rb b/test/drawing/tc_vml_shape.rb
index 188114b6..8e415cc1 100644
--- a/test/drawing/tc_vml_shape.rb
+++ b/test/drawing/tc_vml_shape.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestVmlShape < Test::Unit::TestCase
diff --git a/test/profile.rb b/test/profile.rb
index 7b671831..498f2619 100755
--- a/test/profile.rb
+++ b/test/profile.rb
@@ -1,4 +1,5 @@
 #!/usr/bin/env ruby -s
+# frozen_string_literal: true
 
 $LOAD_PATH.unshift "#{File.dirname(__FILE__)}/../lib"
 require 'axlsx'
diff --git a/test/rels/tc_relationship.rb b/test/rels/tc_relationship.rb
index b38c47e1..04dab810 100644
--- a/test/rels/tc_relationship.rb
+++ b/test/rels/tc_relationship.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestRelationships < Test::Unit::TestCase
diff --git a/test/rels/tc_relationships.rb b/test/rels/tc_relationships.rb
index 488880b4..b1ad7995 100644
--- a/test/rels/tc_relationships.rb
+++ b/test/rels/tc_relationships.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestRelationships < Test::Unit::TestCase
diff --git a/test/stylesheet/tc_border.rb b/test/stylesheet/tc_border.rb
index 132dc68a..96bef927 100644
--- a/test/stylesheet/tc_border.rb
+++ b/test/stylesheet/tc_border.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestBorder < Test::Unit::TestCase
diff --git a/test/stylesheet/tc_border_pr.rb b/test/stylesheet/tc_border_pr.rb
index c82b282d..a1069f5d 100644
--- a/test/stylesheet/tc_border_pr.rb
+++ b/test/stylesheet/tc_border_pr.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestBorderPr < Test::Unit::TestCase
diff --git a/test/stylesheet/tc_cell_alignment.rb b/test/stylesheet/tc_cell_alignment.rb
index 79ed858d..2e95db54 100644
--- a/test/stylesheet/tc_cell_alignment.rb
+++ b/test/stylesheet/tc_cell_alignment.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestCellAlignment < Test::Unit::TestCase
diff --git a/test/stylesheet/tc_cell_protection.rb b/test/stylesheet/tc_cell_protection.rb
index e70bb1b8..a6cc9a5b 100644
--- a/test/stylesheet/tc_cell_protection.rb
+++ b/test/stylesheet/tc_cell_protection.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestCellProtection < Test::Unit::TestCase
diff --git a/test/stylesheet/tc_cell_style.rb b/test/stylesheet/tc_cell_style.rb
index a2990967..d280ccd1 100644
--- a/test/stylesheet/tc_cell_style.rb
+++ b/test/stylesheet/tc_cell_style.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestCellStyle < Test::Unit::TestCase
diff --git a/test/stylesheet/tc_color.rb b/test/stylesheet/tc_color.rb
index 1c14278a..0b23daff 100644
--- a/test/stylesheet/tc_color.rb
+++ b/test/stylesheet/tc_color.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestColor < Test::Unit::TestCase
diff --git a/test/stylesheet/tc_dxf.rb b/test/stylesheet/tc_dxf.rb
index 014f794e..5e25a133 100644
--- a/test/stylesheet/tc_dxf.rb
+++ b/test/stylesheet/tc_dxf.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestDxf < Test::Unit::TestCase
diff --git a/test/stylesheet/tc_fill.rb b/test/stylesheet/tc_fill.rb
index 89e746da..3990a92b 100644
--- a/test/stylesheet/tc_fill.rb
+++ b/test/stylesheet/tc_fill.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestFill < Test::Unit::TestCase
diff --git a/test/stylesheet/tc_font.rb b/test/stylesheet/tc_font.rb
index d3d5fdff..3cee3e63 100644
--- a/test/stylesheet/tc_font.rb
+++ b/test/stylesheet/tc_font.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestFont < Test::Unit::TestCase
diff --git a/test/stylesheet/tc_gradient_fill.rb b/test/stylesheet/tc_gradient_fill.rb
index fa7ca434..a150a01b 100644
--- a/test/stylesheet/tc_gradient_fill.rb
+++ b/test/stylesheet/tc_gradient_fill.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestGradientFill < Test::Unit::TestCase
diff --git a/test/stylesheet/tc_gradient_stop.rb b/test/stylesheet/tc_gradient_stop.rb
index 34b18e36..23a1d58e 100644
--- a/test/stylesheet/tc_gradient_stop.rb
+++ b/test/stylesheet/tc_gradient_stop.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestGradientStop < Test::Unit::TestCase
diff --git a/test/stylesheet/tc_num_fmt.rb b/test/stylesheet/tc_num_fmt.rb
index 33d91f97..490bf59f 100644
--- a/test/stylesheet/tc_num_fmt.rb
+++ b/test/stylesheet/tc_num_fmt.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestNumFmt < Test::Unit::TestCase
diff --git a/test/stylesheet/tc_pattern_fill.rb b/test/stylesheet/tc_pattern_fill.rb
index b2e77b7a..120f5f33 100644
--- a/test/stylesheet/tc_pattern_fill.rb
+++ b/test/stylesheet/tc_pattern_fill.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestPatternFill < Test::Unit::TestCase
diff --git a/test/stylesheet/tc_styles.rb b/test/stylesheet/tc_styles.rb
index 31c8cfb1..3b77616f 100644
--- a/test/stylesheet/tc_styles.rb
+++ b/test/stylesheet/tc_styles.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestStyles < Test::Unit::TestCase
diff --git a/test/stylesheet/tc_table_style.rb b/test/stylesheet/tc_table_style.rb
index cd07733a..ea3334b7 100644
--- a/test/stylesheet/tc_table_style.rb
+++ b/test/stylesheet/tc_table_style.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestTableStyle < Test::Unit::TestCase
diff --git a/test/stylesheet/tc_table_style_element.rb b/test/stylesheet/tc_table_style_element.rb
index febb8b65..93ad9453 100644
--- a/test/stylesheet/tc_table_style_element.rb
+++ b/test/stylesheet/tc_table_style_element.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestTableStyleElement < Test::Unit::TestCase
diff --git a/test/stylesheet/tc_table_styles.rb b/test/stylesheet/tc_table_styles.rb
index f09f4e2d..a02cb09b 100644
--- a/test/stylesheet/tc_table_styles.rb
+++ b/test/stylesheet/tc_table_styles.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestTableStyles < Test::Unit::TestCase
diff --git a/test/stylesheet/tc_xf.rb b/test/stylesheet/tc_xf.rb
index a381c976..b678ce15 100644
--- a/test/stylesheet/tc_xf.rb
+++ b/test/stylesheet/tc_xf.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestXf < Test::Unit::TestCase
diff --git a/test/support/capture_warnings.rb b/test/support/capture_warnings.rb
index c327a145..632f87a3 100644
--- a/test/support/capture_warnings.rb
+++ b/test/support/capture_warnings.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module CaptureWarnings
   def capture_warnings
     # Turn off warnings with setting $VERBOSE to nil
diff --git a/test/tc_axlsx.rb b/test/tc_axlsx.rb
index 21c0c82a..d1c47b47 100644
--- a/test/tc_axlsx.rb
+++ b/test/tc_axlsx.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestAxlsx < Test::Unit::TestCase
@@ -92,7 +94,7 @@ class TestAxlsx < Test::Unit::TestCase
   end
 
   def test_sanitize_frozen_control_strippped
-    needs_sanitize = "legit\x08".freeze # Backspace control char
+    needs_sanitize = "legit\x08" # Backspace control char
 
     assert_equal('legit', Axlsx.sanitize(needs_sanitize), 'should strip control chars')
   end
diff --git a/test/tc_helper.rb b/test/tc_helper.rb
index cd3b3262..f0e55df7 100644
--- a/test/tc_helper.rb
+++ b/test/tc_helper.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 $LOAD_PATH.unshift "#{File.dirname(__FILE__)}/../lib"
 require 'simplecov'
 SimpleCov.start do
diff --git a/test/tc_package.rb b/test/tc_package.rb
index d4581792..f4087c4d 100644
--- a/test/tc_package.rb
+++ b/test/tc_package.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 require 'support/capture_warnings'
 
diff --git a/test/util/tc_mime_type_utils.rb b/test/util/tc_mime_type_utils.rb
index ee7f447a..568aa61d 100644
--- a/test/util/tc_mime_type_utils.rb
+++ b/test/util/tc_mime_type_utils.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestMimeTypeUtils < Test::Unit::TestCase
diff --git a/test/util/tc_serialized_attributes.rb b/test/util/tc_serialized_attributes.rb
index 4ba90b29..02036bab 100644
--- a/test/util/tc_serialized_attributes.rb
+++ b/test/util/tc_serialized_attributes.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class Funk
diff --git a/test/util/tc_simple_typed_list.rb b/test/util/tc_simple_typed_list.rb
index e1ac6d99..ac65529d 100644
--- a/test/util/tc_simple_typed_list.rb
+++ b/test/util/tc_simple_typed_list.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestSimpleTypedList < Test::Unit::TestCase
diff --git a/test/util/tc_validators.rb b/test/util/tc_validators.rb
index 59e4f559..86e2182c 100644
--- a/test/util/tc_validators.rb
+++ b/test/util/tc_validators.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestValidators < Test::Unit::TestCase
diff --git a/test/workbook/tc_defined_name.rb b/test/workbook/tc_defined_name.rb
index 25db45db..4fbd2e58 100644
--- a/test/workbook/tc_defined_name.rb
+++ b/test/workbook/tc_defined_name.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestDefinedNames < Test::Unit::TestCase
diff --git a/test/workbook/tc_shared_strings_table.rb b/test/workbook/tc_shared_strings_table.rb
index 2f7de9a7..4aa308f1 100644
--- a/test/workbook/tc_shared_strings_table.rb
+++ b/test/workbook/tc_shared_strings_table.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestSharedStringsTable < Test::Unit::TestCase
diff --git a/test/workbook/tc_workbook.rb b/test/workbook/tc_workbook.rb
index 0bd84d2d..d85c17d9 100644
--- a/test/workbook/tc_workbook.rb
+++ b/test/workbook/tc_workbook.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestWorkbook < Test::Unit::TestCase
diff --git a/test/workbook/tc_workbook_view.rb b/test/workbook/tc_workbook_view.rb
index 07f21f6a..c8909713 100644
--- a/test/workbook/tc_workbook_view.rb
+++ b/test/workbook/tc_workbook_view.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestWorkbookView < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/auto_filter/tc_auto_filter.rb b/test/workbook/worksheet/auto_filter/tc_auto_filter.rb
index ead6c43a..85ba32b7 100644
--- a/test/workbook/worksheet/auto_filter/tc_auto_filter.rb
+++ b/test/workbook/worksheet/auto_filter/tc_auto_filter.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestAutoFilter < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/auto_filter/tc_filter_column.rb b/test/workbook/worksheet/auto_filter/tc_filter_column.rb
index 84cb41ca..d89446c6 100644
--- a/test/workbook/worksheet/auto_filter/tc_filter_column.rb
+++ b/test/workbook/worksheet/auto_filter/tc_filter_column.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestFilterColumn < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/auto_filter/tc_filters.rb b/test/workbook/worksheet/auto_filter/tc_filters.rb
index 35f17a7b..4cd8ca00 100644
--- a/test/workbook/worksheet/auto_filter/tc_filters.rb
+++ b/test/workbook/worksheet/auto_filter/tc_filters.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestFilters < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_border_creator.rb b/test/workbook/worksheet/tc_border_creator.rb
index 7dff4f0f..46891e8b 100644
--- a/test/workbook/worksheet/tc_border_creator.rb
+++ b/test/workbook/worksheet/tc_border_creator.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestBorderCreator < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_break.rb b/test/workbook/worksheet/tc_break.rb
index 638dcd8d..a441abe0 100644
--- a/test/workbook/worksheet/tc_break.rb
+++ b/test/workbook/worksheet/tc_break.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestBreak < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_cell.rb b/test/workbook/worksheet/tc_cell.rb
index 28a074ae..a534a8dc 100644
--- a/test/workbook/worksheet/tc_cell.rb
+++ b/test/workbook/worksheet/tc_cell.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestCell < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_cfvo.rb b/test/workbook/worksheet/tc_cfvo.rb
index 6098add1..0e2e5332 100644
--- a/test/workbook/worksheet/tc_cfvo.rb
+++ b/test/workbook/worksheet/tc_cfvo.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestCfvo < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_col.rb b/test/workbook/worksheet/tc_col.rb
index d34b84ec..e795c301 100644
--- a/test/workbook/worksheet/tc_col.rb
+++ b/test/workbook/worksheet/tc_col.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestCol < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_color_scale.rb b/test/workbook/worksheet/tc_color_scale.rb
index 6cba553b..335e8057 100644
--- a/test/workbook/worksheet/tc_color_scale.rb
+++ b/test/workbook/worksheet/tc_color_scale.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestColorScale < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_comment.rb b/test/workbook/worksheet/tc_comment.rb
index d6fd41d1..65b2ca1d 100644
--- a/test/workbook/worksheet/tc_comment.rb
+++ b/test/workbook/worksheet/tc_comment.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestComment < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_comments.rb b/test/workbook/worksheet/tc_comments.rb
index e96a581c..445f2342 100644
--- a/test/workbook/worksheet/tc_comments.rb
+++ b/test/workbook/worksheet/tc_comments.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestComments < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_conditional_formatting.rb b/test/workbook/worksheet/tc_conditional_formatting.rb
index 9eee820b..f706dae3 100644
--- a/test/workbook/worksheet/tc_conditional_formatting.rb
+++ b/test/workbook/worksheet/tc_conditional_formatting.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestConditionalFormatting < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_data_bar.rb b/test/workbook/worksheet/tc_data_bar.rb
index 35cf5c11..62c6fc34 100644
--- a/test/workbook/worksheet/tc_data_bar.rb
+++ b/test/workbook/worksheet/tc_data_bar.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestDataBar < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_data_validation.rb b/test/workbook/worksheet/tc_data_validation.rb
index 90fea502..4be68673 100644
--- a/test/workbook/worksheet/tc_data_validation.rb
+++ b/test/workbook/worksheet/tc_data_validation.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 require 'support/capture_warnings'
 
diff --git a/test/workbook/worksheet/tc_date_time_converter.rb b/test/workbook/worksheet/tc_date_time_converter.rb
index 669dee06..5cc9d619 100644
--- a/test/workbook/worksheet/tc_date_time_converter.rb
+++ b/test/workbook/worksheet/tc_date_time_converter.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestDateTimeConverter < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_header_footer.rb b/test/workbook/worksheet/tc_header_footer.rb
index 45a90825..8a62b281 100644
--- a/test/workbook/worksheet/tc_header_footer.rb
+++ b/test/workbook/worksheet/tc_header_footer.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestHeaderFooter < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_icon_set.rb b/test/workbook/worksheet/tc_icon_set.rb
index f065c399..beb69919 100644
--- a/test/workbook/worksheet/tc_icon_set.rb
+++ b/test/workbook/worksheet/tc_icon_set.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestIconSet < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_outline_pr.rb b/test/workbook/worksheet/tc_outline_pr.rb
index cd806d17..95b52530 100644
--- a/test/workbook/worksheet/tc_outline_pr.rb
+++ b/test/workbook/worksheet/tc_outline_pr.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestOutlinePr < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_page_margins.rb b/test/workbook/worksheet/tc_page_margins.rb
index 820c65be..8c580204 100644
--- a/test/workbook/worksheet/tc_page_margins.rb
+++ b/test/workbook/worksheet/tc_page_margins.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestPageMargins < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_page_set_up_pr.rb b/test/workbook/worksheet/tc_page_set_up_pr.rb
index ab39f038..36a2a6f4 100644
--- a/test/workbook/worksheet/tc_page_set_up_pr.rb
+++ b/test/workbook/worksheet/tc_page_set_up_pr.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestPageSetUpPr < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_page_setup.rb b/test/workbook/worksheet/tc_page_setup.rb
index 494db40b..95703c1c 100644
--- a/test/workbook/worksheet/tc_page_setup.rb
+++ b/test/workbook/worksheet/tc_page_setup.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestPageSetup < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_pane.rb b/test/workbook/worksheet/tc_pane.rb
index 5afc142e..59d411a0 100644
--- a/test/workbook/worksheet/tc_pane.rb
+++ b/test/workbook/worksheet/tc_pane.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestPane < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_pivot_table.rb b/test/workbook/worksheet/tc_pivot_table.rb
index 4fafa04d..f5b23a96 100644
--- a/test/workbook/worksheet/tc_pivot_table.rb
+++ b/test/workbook/worksheet/tc_pivot_table.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 def shared_test_pivot_table_xml_validity(pivot_table)
diff --git a/test/workbook/worksheet/tc_pivot_table_cache_definition.rb b/test/workbook/worksheet/tc_pivot_table_cache_definition.rb
index f629940f..108fa297 100644
--- a/test/workbook/worksheet/tc_pivot_table_cache_definition.rb
+++ b/test/workbook/worksheet/tc_pivot_table_cache_definition.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestPivotTableCacheDefinition < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_print_options.rb b/test/workbook/worksheet/tc_print_options.rb
index e568d739..10639bcf 100644
--- a/test/workbook/worksheet/tc_print_options.rb
+++ b/test/workbook/worksheet/tc_print_options.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestPrintOptions < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_protected_range.rb b/test/workbook/worksheet/tc_protected_range.rb
index 1f39ec12..44fe8333 100644
--- a/test/workbook/worksheet/tc_protected_range.rb
+++ b/test/workbook/worksheet/tc_protected_range.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestProtectedRange < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_rich_text.rb b/test/workbook/worksheet/tc_rich_text.rb
index 77d74ab6..ed3ec9ca 100644
--- a/test/workbook/worksheet/tc_rich_text.rb
+++ b/test/workbook/worksheet/tc_rich_text.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class RichText < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_rich_text_run.rb b/test/workbook/worksheet/tc_rich_text_run.rb
index ef2a520c..e9011832 100644
--- a/test/workbook/worksheet/tc_rich_text_run.rb
+++ b/test/workbook/worksheet/tc_rich_text_run.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class RichTextRun < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_row.rb b/test/workbook/worksheet/tc_row.rb
index cd805315..9336ae38 100644
--- a/test/workbook/worksheet/tc_row.rb
+++ b/test/workbook/worksheet/tc_row.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestRow < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_selection.rb b/test/workbook/worksheet/tc_selection.rb
index d2edc669..d68500a5 100644
--- a/test/workbook/worksheet/tc_selection.rb
+++ b/test/workbook/worksheet/tc_selection.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestSelection < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_sheet_calc_pr.rb b/test/workbook/worksheet/tc_sheet_calc_pr.rb
index 0d810378..cd1f6506 100644
--- a/test/workbook/worksheet/tc_sheet_calc_pr.rb
+++ b/test/workbook/worksheet/tc_sheet_calc_pr.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestSheetCalcPr < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_sheet_format_pr.rb b/test/workbook/worksheet/tc_sheet_format_pr.rb
index 5de2fc53..18d62249 100644
--- a/test/workbook/worksheet/tc_sheet_format_pr.rb
+++ b/test/workbook/worksheet/tc_sheet_format_pr.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestSheetFormatPr < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_sheet_pr.rb b/test/workbook/worksheet/tc_sheet_pr.rb
index 7bff60b7..be87ebf7 100644
--- a/test/workbook/worksheet/tc_sheet_pr.rb
+++ b/test/workbook/worksheet/tc_sheet_pr.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestSheetPr < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_sheet_protection.rb b/test/workbook/worksheet/tc_sheet_protection.rb
index 3305b044..4a5e22e8 100644
--- a/test/workbook/worksheet/tc_sheet_protection.rb
+++ b/test/workbook/worksheet/tc_sheet_protection.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 # <xsd:complexType name="CT_SheetProtection">
diff --git a/test/workbook/worksheet/tc_sheet_view.rb b/test/workbook/worksheet/tc_sheet_view.rb
index 1098f42a..b52b6954 100644
--- a/test/workbook/worksheet/tc_sheet_view.rb
+++ b/test/workbook/worksheet/tc_sheet_view.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestSheetView < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_table.rb b/test/workbook/worksheet/tc_table.rb
index 2a3a56db..38f909b9 100644
--- a/test/workbook/worksheet/tc_table.rb
+++ b/test/workbook/worksheet/tc_table.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestTable < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_table_style_info.rb b/test/workbook/worksheet/tc_table_style_info.rb
index 1da1068d..60a4c113 100644
--- a/test/workbook/worksheet/tc_table_style_info.rb
+++ b/test/workbook/worksheet/tc_table_style_info.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestTableStyleInfo < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_worksheet.rb b/test/workbook/worksheet/tc_worksheet.rb
index fc671a59..3c54e3fc 100644
--- a/test/workbook/worksheet/tc_worksheet.rb
+++ b/test/workbook/worksheet/tc_worksheet.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestWorksheet < Test::Unit::TestCase
diff --git a/test/workbook/worksheet/tc_worksheet_hyperlink.rb b/test/workbook/worksheet/tc_worksheet_hyperlink.rb
index 82f6689b..19bacc0e 100644
--- a/test/workbook/worksheet/tc_worksheet_hyperlink.rb
+++ b/test/workbook/worksheet/tc_worksheet_hyperlink.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tc_helper'
 
 class TestWorksheetHyperlink < Test::Unit::TestCase