Remove Layout/TrailingWhitespace offenses

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

3 files changed, 15 insertions, 15 deletions

diff --git a/test/drawing/tc_axis.rb b/test/drawing/tc_axis.rb
index 5a9fa5a3..71e5b6b2 100644
--- a/test/drawing/tc_axis.rb
+++ b/test/drawing/tc_axis.rb
@@ -20,7 +20,7 @@ class TestAxis < Test::Unit::TestCase
     @axis.cross_axis = Axlsx::CatAxis.new
     str  = '<?xml version="1.0" encoding="UTF-8"?>'
     str << '<c:chartSpace xmlns:c="' << Axlsx::XML_NS_C << '" xmlns:a="' << Axlsx::XML_NS_A << '">'
-    doc = Nokogiri::XML(@axis.to_xml_string(str)) 
+    doc = Nokogiri::XML(@axis.to_xml_string(str))
     assert(doc.xpath("//a:srgbClr[@val='00FF00']"))
   end
 
@@ -97,12 +97,12 @@ class TestAxis < Test::Unit::TestCase
     assert_raise(ArgumentError, "requires valid gridlines") { @axis.gridlines = 'alice' }
     assert_nothing_raised("accepts valid crosses") { @axis.gridlines = false }
   end
-  
+
   def test_to_xml_string
     @axis.cross_axis = Axlsx::CatAxis.new
     str  = '<?xml version="1.0" encoding="UTF-8"?>'
     str << '<c:chartSpace xmlns:c="' << Axlsx::XML_NS_C << '" xmlns:a="' << Axlsx::XML_NS_A << '">'
-    doc = Nokogiri::XML(@axis.to_xml_string(str)) 
+    doc = Nokogiri::XML(@axis.to_xml_string(str))
     assert(doc.xpath('//a:noFill'))
     assert(doc.xpath("//c:crosses[@val='#{@axis.crosses.to_s}']"))
     assert(doc.xpath("//c:crossAx[@val='#{@axis.cross_axis.to_s}']"))
diff --git a/test/drawing/tc_d_lbls.rb b/test/drawing/tc_d_lbls.rb
index dddde3a1..d5474131 100644
--- a/test/drawing/tc_d_lbls.rb
+++ b/test/drawing/tc_d_lbls.rb
@@ -4,12 +4,12 @@ class TestDLbls < Test::Unit::TestCase
 
   def setup
     @d_lbls = Axlsx::DLbls.new(Axlsx::Pie3DChart)
-    @boolean_attributes =[:show_legend_key, 
-                          :show_val, 
-                          :show_cat_name, 
-                          :show_ser_name, 
-                          :show_percent, 
-                          :show_bubble_size, 
+    @boolean_attributes =[:show_legend_key,
+                          :show_val,
+                          :show_cat_name,
+                          :show_ser_name,
+                          :show_percent,
+                          :show_bubble_size,
                           :show_leader_lines]
   end
 
@@ -21,11 +21,11 @@ class TestDLbls < Test::Unit::TestCase
   end
 
   def test_initialization_with_optoins
-    
+
     options_hash = Hash[*[@boolean_attributes.map { |name| [name, true] }] ]
 
     d_lbls = Axlsx::DLbls.new(Axlsx::Pie3DChart, options_hash.merge( { :d_lbl_pos => :t }))
-   
+
     @boolean_attributes.each do |attr|
       assert_equal(true, d_lbls.send(attr), "boolean attributes set by options")
     end
@@ -47,7 +47,7 @@ class TestDLbls < Test::Unit::TestCase
   def test_to_xml_string
       str = '<?xml version="1.0" encoding="UTF-8"?>'
       str << '<c:chartSpace xmlns:c="' << Axlsx::XML_NS_C << '" xmlns:a="' << Axlsx::XML_NS_A << '" xmlns:r="' << Axlsx::XML_NS_R << '">'
-      @d_lbls.to_xml_string(str) 
+      @d_lbls.to_xml_string(str)
       str << '</c:chartSpace>'
       doc = Nokogiri::XML(str)
       Axlsx.instance_values_for(@d_lbls).each do |name, value|
diff --git a/test/drawing/tc_num_data.rb b/test/drawing/tc_num_data.rb
index 2549af4d..f2ac64b8 100644
--- a/test/drawing/tc_num_data.rb
+++ b/test/drawing/tc_num_data.rb
@@ -9,11 +9,11 @@ class TestNumData < Test::Unit::TestCase
   def test_initialize
     assert_equal(@num_data.format_code, "General")
   end
- 
+
   def test_formula_based_cell
-  
+
   end
- 
+
   def test_format_code
     assert_raise(ArgumentError) {@num_data.format_code = 7}
     assert_nothing_raised {@num_data.format_code = 'foo_bar'}