Remove Layout/TrailingWhitespace offenses

```
rubocop --only Layout/TrailingWhitespace -a
```

4 files changed, 11 insertions, 11 deletions

diff --git a/test/stylesheet/tc_dxf.rb b/test/stylesheet/tc_dxf.rb
index e94a1614..eb5c4014 100644
--- a/test/stylesheet/tc_dxf.rb
+++ b/test/stylesheet/tc_dxf.rb
@@ -4,7 +4,7 @@ class TestDxf < Test::Unit::TestCase
 
   def setup
     @item = Axlsx::Dxf.new
-    @styles = Axlsx::Styles.new    
+    @styles = Axlsx::Styles.new
   end
 
   def teardown
@@ -46,7 +46,7 @@ class TestDxf < Test::Unit::TestCase
   def test_font
     assert_raise(ArgumentError) { @item.font = 1 }
     assert_nothing_raised { @item.font = Axlsx::Font.new }
-    assert @item.font.is_a? Axlsx::Font 
+    assert @item.font.is_a? Axlsx::Font
   end
 
   def test_border
@@ -59,7 +59,7 @@ class TestDxf < Test::Unit::TestCase
     @item.border = Axlsx::Border.new
     doc = Nokogiri::XML.parse(@item.to_xml_string)
     assert_equal(1, doc.xpath(".//dxf//border").size)
-    assert_equal(0, doc.xpath(".//dxf//font").size)    
+    assert_equal(0, doc.xpath(".//dxf//font").size)
   end
 
   def test_many_options_xml
@@ -69,13 +69,13 @@ class TestDxf < Test::Unit::TestCase
     @item.font = Axlsx::Font.new
     @item.protection = Axlsx::CellProtection.new
     @item.numFmt = Axlsx::NumFmt.new
-    
+
     doc = Nokogiri::XML.parse(@item.to_xml_string)
     assert_equal(1, doc.xpath(".//dxf//fill//patternFill[@patternType='solid']//fgColor[@rgb='FF000000']").size)
     assert_equal(1, doc.xpath(".//dxf//font").size)
     assert_equal(1, doc.xpath(".//dxf//protection").size)
     assert_equal(1, doc.xpath(".//dxf//numFmt[@numFmtId='0'][@formatCode='']").size)
     assert_equal(1, doc.xpath(".//dxf//alignment").size)
-    assert_equal(1, doc.xpath(".//dxf//border").size)    
+    assert_equal(1, doc.xpath(".//dxf//border").size)
   end
 end
diff --git a/test/stylesheet/tc_pattern_fill.rb b/test/stylesheet/tc_pattern_fill.rb
index 3895cffb..fef28248 100644
--- a/test/stylesheet/tc_pattern_fill.rb
+++ b/test/stylesheet/tc_pattern_fill.rb
@@ -33,9 +33,9 @@ class TestPatternFill < Test::Unit::TestCase
     assert_nothing_raised { @item.patternType = :lightUp }
     assert_equal(@item.patternType, :lightUp)
   end
- 
+
   def test_to_xml_string
-    @item = Axlsx::PatternFill.new :bgColor => Axlsx::Color.new(:rgb => "FF0000"), :fgColor => Axlsx::Color.new(:rgb=>"00FF00") 
+    @item = Axlsx::PatternFill.new :bgColor => Axlsx::Color.new(:rgb => "FF0000"), :fgColor => Axlsx::Color.new(:rgb=>"00FF00")
     doc = Nokogiri::XML(@item.to_xml_string)
     assert(doc.xpath('//color[@rgb="FFFF0000"]'))
     assert(doc.xpath('//color[@rgb="FF00FF00"]'))
diff --git a/test/stylesheet/tc_styles.rb b/test/stylesheet/tc_styles.rb
index 503068c0..b9ccfebd 100644
--- a/test/stylesheet/tc_styles.rb
+++ b/test/stylesheet/tc_styles.rb
@@ -44,7 +44,7 @@ class TestStyles < Test::Unit::TestCase
     assert_equal(@styles.borders.size, (prev_border_count+1))
 
     current_border = @styles.borders.last
-  
+
     borders_array.each do |b_opts|
       if b_opts[:edges]
         border_pr = current_border.prs.detect{|x| x.name == b_opts[:edges].first }
@@ -289,7 +289,7 @@ class TestStyles < Test::Unit::TestCase
 
   def test_border_top_without_border_regression
     ### https://github.com/axlsx-styler-gem/axlsx_styler/issues/31
-    
+
     borders = {
       top: { style: :double, color: '0000FF' },
       right: { style: :thick, color: 'FF0000' },
@@ -305,6 +305,6 @@ class TestStyles < Test::Unit::TestCase
       border_pr = current_border.prs.detect{|x| x.name == edge }
       assert_equal(border_pr.color.rgb, "FF#{b_opts[:color]}")
     end
-  
+
   end
 end
diff --git a/test/stylesheet/tc_table_style_element.rb b/test/stylesheet/tc_table_style_element.rb
index 9ef54e2f..554636eb 100644
--- a/test/stylesheet/tc_table_style_element.rb
+++ b/test/stylesheet/tc_table_style_element.rb
@@ -36,7 +36,7 @@ class TestTableStyleElement < Test::Unit::TestCase
     assert_nothing_raised { @item.dxfId = 7 }
     assert_equal(@item.dxfId, 7)
   end
-  
+
   def test_to_xml_string
     doc = Nokogiri::XML(@item.to_xml_string)
    @item.type = :headerRow